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Resonance Frequency patents

      

This page is updated frequently with new Resonance Frequency-related patent applications.




 Antenna and mobile terminal patent thumbnailnew patent Antenna and mobile terminal
An antenna, including a first radiation part, a matching circuit, and a feed source, where the first radiation part includes a first radiator, a second radiator, and a capacitor structure, a first end of the first radiator is connected to the feed source using the matching circuit, the feed source is connected to a grounding part, a second end of the first radiator is connected to a first end of the second radiator using the capacitor structure, a second end of the second radiator is connected to the grounding part, the first radiation part is configured to generate a first resonance frequency, and a length of the second radiator is one-eighth of a wavelength corresponding to the first resonance frequency which helps to reduce an antenna length, and a volume of a mobile terminal.. .
Huawei Device Co., Ltd.


 Magnetic resonance imaging apparatus patent thumbnailnew patent Magnetic resonance imaging apparatus
In one embodiment, an mri apparatus includes a gradient generation circuit configured to apply a gradient pulse according to a pulse sequence in which application of an rf pulse and application of the gradient pulse are included; and an rf transmission circuit configured to (a) perform modulation on a controlled output waveform of the rf pulse in such a manner that the controlled output waveform of the rf pulse follows time variation of a magnetic resonance frequency caused by time variation of an eddy-current magnetic field estimated from a waveform of the gradient pulse and (b) apply the rf pulse subjected to the modulation to an object.. .
Toshiba Medical Systems Corporation


 Vibration sensor and pulse sensor patent thumbnailnew patent Vibration sensor and pulse sensor
A bpf connected to a pulse wave generator has a bandwidth encompassing the fluctuation range of the resonance frequency of a helical antenna. As a result, even if the resonance frequency of the helical antenna fluctuates by a human body approaching the helical antenna, one or a number of a plurality of frequencies of signals passing through the bpf can pass through the bandwidth of the helical antenna..
Kyushu Institute Of Technology


 Resonant inverter and switching power source unit patent thumbnailResonant inverter and switching power source unit
A resonance inverter includes a first coil provided between an input terminal and a switch element, a first capacitor provided between the drain and the source of the switch element, a second capacitor serially connected between the drain and the source of the switch element, and a second coil. A drain-source voltage of a switch element can be effectively lowered, by setting a serial resonance frequency based on the second coil and the second capacitor to a value higher than twice of a driving frequency, and lower than 2.75 times thereof..
Tdk Corporation


 Mobile-terminal charging device and vehicle provided with same patent thumbnailMobile-terminal charging device and vehicle provided with same
In a mobile-terminal charging device, a controller performs a safety operation in a case where a resonance frequency detected by a foreign object detection coil corresponding to a location where a charging coil is present is higher than a reference resonance frequency stored in a memory, or a resonance voltage detected by a foreign object detection coil corresponding to a location where the charging coil is present is lower than a reference resonance voltage stored in the memory.. .
Panasonic Intellectual Property Management Co., Ltd.


 Drive apparatus, electronic device, drive control program, and drive signal generating method patent thumbnailDrive apparatus, electronic device, drive control program, and drive signal generating method
A drive apparatus includes a memory to store waveform data representing a sinusoidal drive signal satisfying a frequency f1=(m/n)×q(t) (m and n: natural numbers, m≠n), to vibrate a vibration-generating device m times, where q(t) is a time characteristic of a resonance frequency of the vibration-generating device, or ((m/2)×r) times (r: natural number≠0, m and n: positive odd, m≠n), the vibration-generating device having the resonance frequency varying depending on an acceleration amplitude in a range between first and second resonance frequencies including the rated value f0; and a drive-processor to output the drive signal to the vibration-generating device. The q(t) is obtained when driving the vibration-generating device by a sinusoidal drive signal satisfying f1=(m/n)×f2, to vibrate the vibration-generating device m times if m≠n, or ((m/2)×r) times..
Fujitsu Limited


 Rotary drive device and image forming apparatus patent thumbnailRotary drive device and image forming apparatus
A rotary drive device includes a drive motor and drive transmission portion, which transmits a rotational drive force of the motor to a driven rotor and includes three or more drive transmission members. A high stiffness member is attached to a low-stiffness drive transmission member, which is one, lower in stiffness, of two of the drive transmission members, to increase stiffness of the low-stiffness drive transmission member.
Ricoh Company, Limited


 Automated determination of the resonance frequencies of protons for magnetic resonance examinations patent thumbnailAutomated determination of the resonance frequencies of protons for magnetic resonance examinations
In a method and a magnetic resonance (mr) system for automated determination of the resonance frequency of a nucleus for magnetic resonance examinations, at least one mr signal is detected, and is fourier-transformed into a spectrum composed of elements that can be represented as a vector. An analysis of the spectrum is conducted, wherein at least two cross-correlation coefficients of at least one model spectrum are determined by use of the measured spectrum.
Siemens Aktiengesellschaft


 Control  electrical converter with lc filter patent thumbnailControl electrical converter with lc filter
An electrical converter is interconnected via a filter with an electrical load or an electrical power source. A method for controlling the converter comprises the steps of: receiving a reference flux (ψ*i) for the electrical converter; determining output signals (y) comprising currents and/or voltages measured in the filter; determining an estimated flux (ψi) from the output signals (y); determining a corrective flux (ψi,damp) from the output signals (y) based on a mathematical model of the filter and a quadratic cost function; determining control input signals (u) for the electrical converter based on a sum of the estimated flux (ψi) and the corrective flux (ψi,damp); controlling the converter with the control input signals (u); and algorithmic filtering of at least one of the output signals (y) by applying a signal filter to the at least one output signal, which is designed for amplifying the at least one output signal at a resonance frequency of the filter, whereby the corrective flux (ψi,damp) is determined from the filtered output signals..
Abb Technology Ag


 Akinetic swept laser  fast sweeping of the same patent thumbnailAkinetic swept laser fast sweeping of the same
The present invention discloses a method and apparatus for producing a narrow line laser emission that can be tuned at frequency rates exceeding 100 khz. The laser apparatus is capable of fast scanning speeds close to multiples of the cavity resonance frequency.
University Of Kent


Servo controller for measuring lubrication characteristics of a machine by experimental modal analysis


A servo controller includes: a sinusoidal wave disturbance input unit for supplying a sinusoidal wave disturbance to a speed control loop including a speed command generator, a torque command generator and a speed detector; a frequency response calculator for estimating the gain and phase from the output of the speed control loop; a resonance frequency detector for detecting resonance frequencies at which the gain becomes maximum; a resonance mode characteristics analyzer for estimating resonance characteristics from the frequency response; and, a reference modal damping ratio retainer for retaining a reference modal damping ratio as a resonance characteristic corresponding to the reference lubricating condition, and the resonance mode characteristics analyzer calculates lubrication characteristics on the basis of the reference modal damping ratio and the measured modal damping ratio at the resonance frequency corresponding to the reference modal damping ratio.. .
Fanuc Corporation


Process for the electromagnetic modification of liquid mineral resources used as sources of power and a device for putting the same into practice


A process for the electromagnetic modification is based on the application of the nuclear magnetic resonance effect when the electromagnetic energy for destroying chemical bonds is lowered, and the frequency selection enables to selectively act on a determined type of molecules. The process uses a two-circuit adjustment of the nuclear magnetic resonance frequency where the first control circuit is used for an accurate adjustment and maintaining of the frequency that breaks the bonds of a specific type of molecules, the second control circuit enabling, with the help of a quality analyzer, to select the type of molecules to be modified..
Samara State Aerospace University


Audiologic test apparatus and method


An audiologic test apparatus includes: a pump device configured to apply a first pressure to the ear canal; and a processing module for communicatively coupling to the pump device and to a signal generator, wherein the processing module is configured to obtain first acoustic parameter values indicative of an acoustic parameter at the first pressure based on a first broadband signal generated using the signal generator; wherein the pump device is configured to change the first pressure to a changed pressure, and wherein the pump device is also configured to apply a second pressure to the ear canal; and wherein the processing module is also configured to obtain second acoustic parameter values indicative of the acoustic parameter at the second pressure based on a second broadband signal generated using the signal generator, and determine a middle ear resonance frequency based on the first and second acoustic parameter values.. .
Gn Otometrics A/s


Power converter and cooking apparatus including the same


A power converter and a cooking apparatus including the same are disclosed. The power converter includes a switching unit to perform switching using a direct current (dc) voltage and to output an alternating current (ac) voltage, a driving unit to output a high-frequency voltage to a magnetron based on the ac voltage, an output voltage detector to detect an output voltage flowing to the magnetron, and a controller to calculate a frequency command value based on the detected output voltage, to generate a frequency command value by avoiding a resonance frequency when the calculated frequency command value corresponds to the resonance frequency, and to output the generated frequency command value to the switching unit.
Lg Electronics Inc.


Device, system, and frequency generation using an atomic resonator


Some demonstrative embodiments include devices, systems and/or methods of generating a frequency reference using a solid-state atomic resonator formed by a solid-state material including an optical cavity having color centers. A device may include a solid-state atomic clock to generate a clock frequency signal, the solid-state atomic clock including a solid state atomic resonator formed by a solid-state material including au optical cavity having color centers, which are capable of exhibiting hyperfine transition, wherein the solid-state atomic clock may generate the clock frequency signal based on a hyperfine resonance frequency of the color centers..
Dimension 4 Ltd.


Non-contact wireless communication coil, transmission coil, and portable wireless terminal


In a coil unit, a first magnetic body 11, a first coil 12 for non-contact power transmission, a second magnetic body 21, a substrate 30, and a second coil 22 for non-contact wireless communication are laminated in this order in the thickness direction of the coils. The first coil 12 and the second coil 22 at least partially overlap each other.
Panasonic Intellectual Property Management Co., Ltd.


A vibration system of a loudspeaker


The present invention discloses a vibration system of a loudspeaker, comprising a diaphragm and a voice coil attached to one side of the diaphragm, wherein the diaphragm comprises at least two layers of polyether-ether-ketone base films, and furthermore, the diaphragm comprises at least one layer of crystallized polyether-ether-ketone base film and at least one layer of non-crystallized polyether-ether-ketone base film. The diaphragm made of both crystallized and non-crystallized polyether-ether-ketone base films can have both an effectively improved acoustic performance and a lowered resonance frequency f0, thus, the acoustic effect of the loudspeaker can be improved.
Goertek Inc.


Power transmission device


The power transmission device includes a first power transmitter and a second power transmitter that respectively adjust the capacitance such that a resonance frequency is attained, based on a variation degree of a phase difference with respect to a variation of the capacitance when the capacitance of a variable capacitance unit is varied, and the first control unit adjusts the resonance frequency of the first power transmitter in a state where the second power transmitter is off, and the second control unit adjusts the resonance frequency of the second power transmitter in a state where the first power transmitter is off.. .

Torsional vibration resonance frequency measurement estimating stability of dental implant and novel amplitude transformer


The present invention relates to a torsional vibration resonance frequency measuring method and a novel amplitude transformer for assessing the stability of dental implants. In one example, a torsional vibration resonance frequency measuring method includes installing an amplitude transformer on a dental implant, energizing a torsional vibration mode, gathering resonance signals, and analyzing a resonance frequency.
The Fourth Military Miedical University Of Chinese People's Liberation Army


Low-profile cavity broadband antennas having an anisotropic transverse resonance condition


Embodiments of the present invention relate to low-profile broadband antennas having an anisotropic traverse resonance condition. One important aspect of the invention is the incorporation of an anisotropic high index medium material, at least partially loaded within the cavity, which is configured to maintain a constant resonance frequency of the antenna.
U.s. Army Research Laboratory Attn: Rdrl-loc-i


Low-profile, tapered-cavity broadband antennas


Embodiments of present inventions relate to low-profile, tapered cavity broadband antennas. One important aspect of the invention (although not the only) is the incorporation of a tapered lateral sidewalls in the antenna cavity.
U.s. Army Research Laboratory Attn: Rdrl-loc-i


Compliance chamber with linear motor for marine acoustic vibrators


Provided are marine acoustic vibrators and methods of using marine acoustic vibrators. An example marine acoustic vibrator comprises a sound radiating surface operable to produce a resonance frequency, wherein the sound radiating surface at least partially defines a marine acoustic vibrator internal volume, wherein the marine acoustic vibrator internal volume comprises a marine acoustic vibrator internal gas having a marine acoustic vibrator internal gas pressure; a compliance chamber, wherein the compliance chamber comprises a compliance chamber internal volume, and a spring function system; a linear motor operable to adjust the compliance chamber internal volume; wherein pressure variations in the marine acoustic vibrator internal volume generated by actuation of the sound radiating surface induce the spring function system and the linear motor to adjust the compliance chamber internal volume such that the pressure variations in the marine acoustic vibrator internal volume are reduced..
Pgs Geophysical As


System for detecting a gas and method therefor


An apparatus and method for detecting a gas with high sensitivity, high snr, and low cost is disclosed. Embodiments of the present invention include sensor nodes that communicate with a common controller, where each sensor node includes a resonant sensor that comprises a resonator having a selectively chemisorptive layer disposed upon it.
Case Western Reserve University


Device and estimating tire pressure of vehicle


Disclosed are a tire pressure estimating method and a tire pressure estimating device. The tire pressure estimating method of a tire pressure estimating device that stores a pca weighting coefficient to perform the principle component analysis (pca) and an lda discriminant coefficient to perform the linear discriminant analysis (lda) for an fft signal pattern of a resonance frequency band of an fast fourier transform (fft) signal obtained through the fft of a wheel speed signal, in order to distinguish between a plurality of tire pressure states, may include: detecting the wheel speed signal through a wheel speed sensor; performing the fft for the detected wheel speed signal; projecting an fft signal pattern of the resonance frequency band of the fft signal onto a pca space by using the pca applied with the stored pca weighting coefficient; and performing the lda applied with the stored lda discriminant coefficient with respect to the data that is projected onto the pca space to then determine a tire pressure state corresponding to the data projected onto the pca space..
Mando Corporation


Fluid-filled vibration damping device


A fluid-filled vibration device including a pressure receiving chamber and an equilibrium chamber communicated by an orifice passage and a connecting hole provided on a partition member partitioning the two chambers. The connecting hole is closed by a closing rubber elastic plate to which pressures of the two chambers are applied from the respective sides.
Sumitomo Riko Company Limited


Inductive power supply with device identification


An inductive power supply system to identify remote devices using unique identification frequencies. The system includes an aips and a tank circuit capable of inductively providing power to a remote device at different frequencies, and a sensor for sensing the reflected impedance of the remote device at tank circuit.

Chip card


According to one embodiment, a chip card is described including a chip, an antenna, a coupling structure configured to transmit energy from the antenna to the chip and a control element configured to control, depending on a field strength of a magnetic field to which the chip card is exposed, at least one of the resonance frequency of the antenna, the quality factor of the antenna and an energy transmission efficiency of the coupling structure.. .

Wafer clamp detection based on vibration or acoustic characteristic analysis


A workpiece clamping status detection system and method for detecting a clamping state of a clamping device is provided. A clamping device having a clamping surface is configured to selectively clamp a workpiece to the clamping surface.

Optical filter device, optical module, and electronic equipment


A variable wavelength interference filter is fixed to the base, and the fixing material fixes at least one of the substrates to the base via at least one location of one surface side along a substrate thickness direction. A first order resonance frequency of the variable wavelength interference filter in which a fixing position of the fixing material is used as a fixed end is less than or equal to half a value of a first order resonance frequency of the movable section..

Method for damping resonant component of common-mode current of multi-phase power converter


The present disclosure describes a method and arrangement for damping a resonant component of a common-mode current of a multi-phase power converter comprising an output filter with a virtual ground connection to the power converter. In the method and arrangement, the common-mode current is determined, a feedback signal is formed on the basis of the common-mode current, and the feedback signal is injected into a common mode current reference in order to dampen the resonance frequency component.

Inductive rotary joint with multimode inverter


An inductive power transfer circuit or inductive rotary joint has an inductive rotating coupler with a primary side and a primary winding rotatably arranged against a secondary side and a secondary winding. The secondary side is connected via a rectifier to a load.

Acoustic measurement of wellbore conditions


A method of measuring fluid flow conditions in a wellbore includes generating an acoustic probe signal during fluid flow along the wellbore, measuring the performance attribute of the acoustic probe signal within a target frequency range, and of the fluid medium in at least a part of the wellbore based on the measured performance parameters. The target frequency range of the acoustic probe signal encompasses a bubble resonance frequency range for vapor bubbles in the wellbore, for example having frequencies in excess of 20 khz.

Determining resonance frequency and quality factor


Methods and apparatus for obtaining data from a density-viscosity (dv) sensor of a downhole tool, wherein the dv sensor comprises a resonating element disposed in a fluid flowing in a flowline of the downhole tool, and determining a resonance frequency and quality factor of the resonating element utilizing a nonlinear regression and/or a plurality of resonance modes exhibited by the obtained data.. .

Acoustic wave intraocular pressure detecting device and method thereof


The present invention provides an acoustic wave intraocular pressure detecting device and a method thereof, which uses a driver to generate a vibration wave on the skin or bones. The energy of the vibration wave is transmitted to the orbital bones via the skin and the skeletons.

Noise cancellation resonator


In order to provide a noise cancellation resonator that is highly effective in reducing noise, a noise cancellation resonator of the present invention is characterized by including: a noise cancellation resonator coil with an inductance component of ln; and a noise cancellation resonator capacitor with a capacitance component of cn, wherein the noise cancellation resonator has a resonance frequency that is calculated by adding a shift frequency that is determined based on a degree of coupling between a main resonator coil and the noise cancellation resonator coil, to a predetermined frequency of an electromagnetic field generated by a main resonator that is a source of noise and includes the main resonator coil.. .
Equos Research Co., Ltd.


Electronic device


An electronic device that has a circuit network therein and conducts at least one of power reception and communication with an external device through a wire harness includes a detection circuit and a resonance frequency shift circuit. The detection circuit detects a voltage variation caused by a noise that has a frequency component near a resonance frequency and superimposes on at least one of the wire harness and the circuit network.
Denso Corporation


Servo control device having automatic filter adjustment function based on experimental modal analysis


A servo control device includes: a speed control loop including a speed command generating unit, a torque command generating unit, and a speed detecting unit; a sine wave disturbance input unit; a frequency response calculating unit estimating a gain and phase of speed control loop input/output signals; a resonance frequency detecting unit; a resonance mode characteristic estimating unit estimating resonance characteristics from the frequency response at a resonance frequency and frequencies therearound; a rigid-body mode characteristic estimating unit estimating rigid-body characteristics from the frequency response in a low-frequency band; a filter attenuating a component in a particular frequency band in a torque command; and a filter adjusting unit making setting so that the filter has specified characteristics. The filter adjusting unit further includes a filter adjusting part attenuating a component in a frequency band corresponding to a resonance mode estimated by the resonance mode characteristic estimating unit..
Fanuc Corporation


Geophone with tunable resonance frequency


An illustrative geophone with tunable resonance frequency includes a first inductive assembly including an inductive coil having a first magnet arranged therein, wherein the first magnet and the first inductive coil move relative to each other, and a second inductive assembly including a second inductive coil having a second magnet arranged therein, wherein the second magnet and the second inductive coil move relative to each other. A coupling element couples a movable element of the first inductive assembly with a moveable element of the second inductive assembly.
Halliburton Energy Services, Inc.


Laminate design-based radio frequency coil unit for mri


A radio frequency coil unit (10) for use in a magnetic resonance imaging system, the radio frequency coil unit (10) comprising: at least one electrically insulating substrate (18); at least one radio frequency coil member (12) disposed at a first side (22) of the electrically insulating substrate (18); a first capacitor member (26) disposed at the first side (22) of the electrically insulating substrate (18) and galvanically connected to the at least one radio frequency coil member (12); a second capacitor member (28) disposed at a second side (24) of the electrically insulating substrate (18) which is opposite of the first side (22); wherein the first capacitor member (26) and the second capacitor member (28) at least partially overlap in a direction (20) perpendicular to a sur face of the electrically insulating substrate (18); and wherein the at least one radio frequency coil member (12), the first capacitor member (26) and the second capacitor member (28) are part of a radio frequency resonance circuit having a resonance frequency that coincides with the larmor frequency, which is determined by a magnetic field strength of the magnetic resonance imaging system and the species of nuclei under investigation. The capacitor structure at the second side of the substrate has an integrated resonant loop structure of which the resoance properties are indicative of the capacitor values formed by the overlapping capacitor members..
Koninklijke Philips N.v.


Phase-locked loop with an adjustable output divider


An apparatus relates generally to providing a divided signal output. In such an apparatus, a controller is coupled to receive a reference frequency count and a feedback frequency count to determine a difference therebetween to provide a control setting.
Xilinx, Inc.


Bulk acoustic wave resonator and filter


A bulk acoustic wave resonator and a filter in which partial thicknesses of protection layers or reflection layers thereof are differently formed are provided. The bulk acoustic wave resonator includes a bulk acoustic wave resonating part comprising a piezoelectric layer, and a reflection layer configured to reflect waves of a resonance frequency generated by the piezoelectric layer based on a signal applied to the bulk acoustic wave resonating part.
Samsung Electro-mechanics Co., Ltd.


Wireless power supply system


A wireless power supply system has a power sending resonance coil, a power receiving resonance coil, and a relay resonance coil. The power sending resonance coil has a predetermined resonance frequency characteristic, and transmits power wirelessly.
Fujitsu Limited


Resonant cavity mode enabled wireless power transfer


An embodiment provides a method of wireless power transmission, including: powering a transmitter that produces electromagnetic waves in a three dimensional structure; selecting a transmission frequency that is a resonance frequency for the three dimensional structure; and transmitting, using the transmitter, electromagnetic waves within the three dimensional structure on the transmission frequency selected. Other systems, methods, apparatuses and products are described and claimed..
Disney Enterprises, Inc.


Position pointer of the electromagnetic induction type and electronic ink cartridge


A position pointer is disclosed, in which an electronic ink cartridge of an electromagnetic induction type is accommodated. The electronic ink cartridge includes a resonance circuit having a coil and a capacitor circuit, and is configured to detect pressure applied to a core member accommodated in the position pointer based on a variation of a resonance frequency of the resonance circuit.
Wacom Co., Ltd.


Optical scanning device and image forming apparatus


An optical scanning device includes a light source configured to emit a light beam; a rotary deflector configured to perform optical scanning by reflecting and deflecting the light beam emitted from the light source while rotating; an optical system forming member configured to form a path of the light beam; and a resonator having a resonance frequency corresponding to a sound generated by rotational drive of the rotary deflector. The rotary deflector is installed in a closed space.
Ricoh Company, Limited


Noncontact resonameter, process for making and use of same


A noncontact resonameter includes: a resonator to: produce an excitation signal including a field; subject a sample to the excitation signal; produce a first resonator signal in a presence of the sample and the excitation signal, the first resonator signal including: a first quality factor of the resonator; a first resonance frequency of the resonator; or a combination thereof, the first resonator signal occurring in an absence of contact between the sample and the resonator; and produce a second resonator signal in a presence of the excitation signal and an absence of the sample, the second resonator signal including: a second quality factor of the resonator; a second resonance frequency of the resonator; or a combination thereof; a circuit in electrical communication with the resonator to receive the first resonator signal and the second resonator signal; and a continuous feeder to: provide the sample proximate to the resonator; dispose the sample intermediately in the field of the excitation signal during production of the first resonator signal; remove the sample from the resonator; and manipulate a position of the sample relative to the resonator in a continuous motion and in an absence of contact between the sample and the resonator.. .
National Institute Of Standards And Technology


High precision reciprocating bob viscometer


A high precision, reciprocating bob viscometer is shown that has two coils (a and b) encircling a reciprocating bob. Coil a is energized with a combined sinusoidal and dc signal, while coil b senses the position of the reciprocating bob, then the functions of coils a and b are reversed.
Cambridge Viscosity, Inc.


Half-tube array vibration energy harvesting method using piezoelectric materials


A piezoelectric transducer for harvesting ambient vibration energy is made up of a curved substructure beam, two half-tube piezoelectric elements and a mass block. One end of the beam is fixed on a vibration base and the other end is attached with the mass block.

Micromechanical resonant switches and charge pumps


A circuit of n micromechanical resonant switches (resoswitches) is presented, which mimics a dickson charge pump to amplify an input voltage to an output voltage of n plus 1 times the input voltage, while avoiding the diode voltage drop and breakdown voltage limitations of cmos-based conventional charge pumps. Important aspects of successful charge pumping are: 1) the long cycle lifetime of resonant micromechanical switches, which has been shown to operate 173.9×1012 cycles, is orders of magnitude higher than non-resonant switches; 2) the use of gated-sinusoid drive excitation to allow a charging period independent of resoswitch resonance frequency; and 3) the use of resonance operation to lower required drive and dc-bias voltages to below the supply voltage.
The Regents Of The University Of California


System and externally calibrated parallel imaging in the presence of an inhomogeneous magnetic field


A system and method for accelerated magnetic resonance imaging (mri) includes controlling an rf system of an mri system to acquire coil calibration data from a subject including a material causing inhomogeneities in a static magnetic field of the mri system when arranged in the bore of the mri system. After acquiring the coil calibration data, the rf system is controlled to acquire imaging data from the subject at multiple different resonance frequency offsets.
Wisconsin Alumni Research Foundation


Dual use of a ring structure as gyroscope and accelerometer


Methods and apparatus for sensing linear acceleration with a mems resonator mass, alone, or concurrently with sensing rate of rotation. A resonator mass, which may be a disk or a ring structure, is driven at a resonance frequency of one of the vibration modes of the resonator mass.
Analog Devices, Inc.


Mechanically actuated panel acoustic system


An electronic device whose enclosure or housing panel is used as part of an acoustic system is described. The panel is divided into several sub-panels.
Apple Inc.


Pen with inductor


A processing system includes a sensor module and a determination module. The sensor module is coupled to sensor electrodes and is the sensor module configured to drive the sensor electrodes with sensing signals at a first resonance frequency of the pen.
Synaptics Incorporated


Smart resonating pen


A resonating pen having multiple resonance frequencies includes a first circuit segment including an inductor for the resonance frequencies, a second circuit segment including transistors, where each of the transistors includes a transistor state, and a third circuit segment includes a controller. The controller is configured to alter the transistor state of the transistors to change the resonating pen to a resonance frequency.
Synaptics Incorporated


Pressure sensor using piezoelectric bending resonators


A pressure sensor including an enclosure and a bending resonator housed in the enclosure. The bending resonator includes a diaphragm connected to the enclosure, a piezoelectric layer on the diaphragm, and an electrode on the piezoelectric layer.
California Institute Of Technology


Power feed device, power reception device and power feed method


Power feed device (100) supplies power to storage battery (152) mounted on vehicle (150), through power receiving unit (154) of vehicle (150). Power supply unit (104) performs preliminary supply to power receiving unit (154) while sequentially changing a frequency, and performs main supply with power larger than in the preliminary supply.
Panasonic Intellectual Property Management Co., Ltd.


Wireless power transmitter, wireless power receiver, wireless power transmission method and wireless power reception method


A wireless power reception method of a wireless power receiver for receiving power from a wireless power transmitter is disclosed. The wireless power receives a connection signal for identifying the wireless power receiver from the wireless power transmitter; transmitting a response signal in response to the connection signal to the wireless power transmitter; negotiating a power transmission condition with the wireless power transmitter; and receiving the power using resonance frequency band according to the negotiated power transmission condition.
Lg Innotek Co., Ltd.


Resonance tuning


Another tuning heuristic includes monitoring a circuit parameter while sweeping the power source frequency; identifying two frequencies related to two local maximum for the values of the circuit parameter; determining a desired resonance frequency for the wireless power transfer device based on stored information; and adjusting the tuning component to a value that causes the wireless power transfer device when uncoupled to operate at or near the desired resonance frequency.. .

Tuning circuit, tuning method and resonance-type contactless power supply


The present disclosure relates to a tuning circuit, a tuning method and a resonance-type contactless power supply. The resonance-type contactless power supply has the characteristic that an inductor current has a maximum value when it operates at a resonance frequency.
Silergy Semiconductor Technology (hangzhou) Ltd.


Power transmission device, wireless power feeding system, and control method


The present power transmission device performs a power transmission process for transmitting power in a wireless manner through electromagnetic field resonance coupling using a resonance circuit. In a case where a resonance frequency of the resonance circuit set to be the same as a frequency of a power transmission signal which is output as transmission power is deviated during transmission of the power, the present power transmission device detects a direction in which the resonance frequency is deviated and controls the power transmission process on the basis of a detection result thereof.
Renesas Electronics Corporation


Method and balun for trapping rf current on a transmission line after installation


Apparatus and method for a radially attachable rf trap attached from a side to a shielded rf cable. In some embodiments, the rf trap creates a high impedance on the outer shield of the rf cable at a frequency of rf signals carried on at least one inner conductor of the cable.
Life Services, Llc


Compensating electrical harmonics on the electrical grid


The invention relates to a control system for compensating undesired electrical harmonics on an electrical grid. Part of the control system referred to as a harmonic compensator is operatively connected with a power inverter of a power producing unit supplying power to the grid.
Vestas Wind Systems A/s


Tire pressure decrease detection apparatus, method, and program


A tire pressure decrease detection apparatus comprising a rotation speed information detection unit for detecting rotation speed information of wheels of a vehicle, a resonance frequency estimate unit for time-series estimating a torsional resonance frequency of the rotation speed information from the rotation speed information obtained by the rotation speed information detection unit, and a judgment unit for judging a decrease in pressure of tires installed in the wheels based on the estimated torsional resonance frequency. The resonance frequency estimate unit includes a noise removal unit for removing a noise superimposed on a wheel speed signal serving as the rotation speed information for each of the wheels with using an active noise control technology..
Sumitomo Rubber Industries, Ltd.


Exhaust purifying device for internal combustion engine


The device includes an exhaust passage having an upstream end connected to an exhaust port of the engine and a downstream end provided with a catalytic converter, a secondary air passage having a downstream end connected to an intermediate point of the exhaust passage and an upstream end communicating with the atmosphere, and a reed valve provided in an upstream end of the secondary air passage to permit air flow from the atmosphere to the exhaust passage but not in the opposite direction. The reed valve has a resonance frequency which is z times the prescribed exhaust frequency of the engine, where z is an integer.
Honda Motor Co., Ltd.


Polyamide resin composition having high melt point and being excellent in anti-vibration property upon water absorption


The present invention provides a polyamide resin composition having high melt point which can produce a molded product having high anti-vibration property or, in other words, having very high resonance frequency and, in particular, being capable of retaining high resonance frequency even upon water absorption. A polyamide resin composition, comprising a polyamide resin (a) having melt point (tm) of 290° c.
Toyobo Co., Ltd.


Method to optimize electrode placement for cranial electrical stmulation


A method for optimum preparation and placement of transcranial electrodes is described. The method consists of application of liquid silver paint to standard monitoring electrodes and placement of bilateral electrodes over the pterions, the thinnest areas of the skull.

Duplexer and communication module


A branching 1 filter has an antenna terminal 3 which receives signal waves and disturbance waves, a transmission filter 11 which is connected to the antenna terminal 3, a reception filter 13 which is connected to the antenna terminal 3 and receives a portion of the signal waves and has, as a passband, a frequency range higher than a passband of the transmission filter 11, and a disturbance wave resonator which is connected to the antenna terminal 3 and to the ground and positioned closer to the antenna terminal 3 side than the transmission filter 11 and the reception filter 13. The disturbance wave resonator 15 is connected to antenna terminal 3 at a position closer to the antenna terminal 3 side than the transmission filter 11 and the reception filter 13.
Kyocera Corporation


Multiple-tuned filter design hvdc system


A method of designing a multiple-tuned filter (mtf) of a high voltage direct current (hvdc) system is provided. The method includes selecting an input parameter for the mtf, setting a resonance frequency of the mtf, calculating values of inductance (l) and capacitance (c) which are filter parameters of the mtf on the basis of the input parameter and the resonance frequency, combining a value of resistance (r) with the filter parameters and calculating a price according to the combination, and storing the combined values of r, l, and c when the calculated price falls within a predetermined price range..
Lsis Co., Ltd.


Organic light-emitting diode, array substrate and preparation method thereof, and display device


The present invention relates to an organic light-emitting diode, an array substrate and a preparation method thereof, and a display device. The organic light-emitting diode comprises an anode, a cathode, a light-emitting layer disposed between the anode and the cathode, and a hole injection layer disposed between the anode and the light-emitting layer, wherein the hole injection layer is provided therein with metal nanoparticles, and the frequency of a localized surface plasmon resonance of the metal nanoparticles is matched with the emission wavelength of the light-emitting layer.
Boe Technology Group Co., Ltd.


Plasma processing apparatus


A resonance frequency is adjusted or optimized by shifting the resonance frequency without reducing an impedance function or a withstand voltage characteristic against a high frequency noise, when blocking, by using a multiple parallel resonance characteristic of a distributed constant line, the high frequency noise introduced into a line such as a power feed line or a signal line from an electrical member other than a high frequency electrode within a processing vessel. Regarding winding pitches, each of the solenoid coils 104(1) and 104(2) is divided to multiple sections k1, k2, .
Tokyo Electron Limited


Method and magnetic resonance imaging with a music-based gradient curve


In a method and apparatus for magnetic resonance imaging with a music-based gradient curve, a magnetic resonance sequence and a piece of music are provided to a controller of a magnetic resonance apparatus. The piece of music is modified in the controller by taking into account at least one acoustic resonance parameter that characterizes at least one acoustic resonance frequency of the magnetic resonance apparatus, so a modified piece of music is generated.
Siemens Aktiengesellschaft


Vibration element, electronic device, electronic apparatus, and moving object


An vibration element includes a drive vibration section and a detection vibration section, and the detection vibration section has a detection mode 1 and a detection mode 2 as an vibration mode for detection in which the detection vibration section resonates with coriolis force produced in the drive vibration section and vibrates. A resonance frequency (vibration frequency) of the drive vibration section is higher than a resonance frequency (vibration frequency) in the detection mode 1 and a resonance frequency (vibration frequency) in the detection mode 2, or the vibration frequency of the drive vibration section is lower than the resonance frequency (vibration frequency) in the detection mode 1 and the resonance frequency (vibration frequency) in the detection mode 2..
Seiko Epson Corporation


Portable radio device adapted to function as a wireless charger


A portable radio device is adapted to function as a wireless charger. The device includes a power supply source, a power control circuit, a controller, a power amplifier connected to the power control circuit to draw a first supply voltage from the power control circuit, and a source coil.
Motorola Solutions, Inc


Wireless power transfer system and method thereof


A wireless power transfer system and method is provided. The system includes a source coil that is coupled to a power supplying device and a receiver coil that is coupled to a power receiving device.
Motorola Solutions, Inc


Systems and methods for laser frequency stabilization using an arbitrarily birefringent resonator


Systems and methods to stabilize a laser frequency include a birefringent resonator that introduces an arbitrary phase difference between two polarization components of the laser beam, a polarizing beam splitter to separate the two polarization components after the birefringent resonator, and a differential detector to monitor the separated two polarizations, based on which an error signal can be produced to control a servo to adjust the laser frequency or resonator resonance frequency accordingly. The birefringent resonator can comprise a fiber ring, a whispering gallery mode (wgm) resonator, or any other birefringent ring resonator.

Device for electrically disintegrating cell clusters


According to the invention, the electronic control unit has means for determining the resonance frequency of the high-voltage source (56).. .

Tunable multiple-resonance antenna systems, devices, and methods for handsets operating in low lte bands with wide duplex spacing


The present subject matter relates to antenna systems, devices, and methods that provide efficient coverage of low frequency bands (e.g., 700 mhz-bands and 600 mhz-bands) for the new generations of mobile communication. For example, a dual-resonant radiating system can include a ground plane, a radiating coupler spaced apart from but in communication with the ground plane, and a ground plane extension in communication with the ground plane.

Compliance chambers for marine vibrators


A marine vibrator may include a containment housing, a sound radiating surface, and a compliance chamber. The compliance chamber may include a compliance chamber housing, a non-linear linkage assembly, and a low pressure chamber.

Using a cavity to polarize a spin ensemble


In some aspects, polarization of a spin ensemble can be increased using cavity-based techniques. A resonator applies drive field to a spin ensemble in a static magnetic field.

Crystal oscillator start-up circuit


A crystal oscillator start-up circuit capable of reducing a start-up time of a crystal oscillator is disclosed. The crystal oscillator start-up circuit is provided with a crystal oscillation unit including a crystal oscillator, a converter and an external oscillator.

Power supply apparatus


A power supply apparatus for supplying power in a wireless manner or a wired-wireless manner is provided. The power supply apparatus includes a power conversion unit converting input power into first power, and a wireless power supply unit varying a switching frequency switching the first power to wirelessly transmit the switched first power in one of a first wireless transmission manner or a second wireless transmission manner or wirelessly transmit the switched first power at a frequency within a resonance frequency band of one wireless transmission manner of wireless transmission manners having different resonance frequency bands..

Rotating body provided with blades


A rotating body includes a rotating body core, and a plurality of blades provided at an outer or inner circumference of the rotating body core at equal intervals in a circumferential direction, and connected circumferentially via an annular connection portion provided separately from the rotating body core. A resonance frequency under a two nodal diameter number mode of the rotating body is lower than or equal to a rotational secondary harmonic frequency with respect to a rated rotation speed.

Resonance frequency adjustment module


A resonance frequency adjustment module is disclosed forming a mems sensor for detecting an angular velocity. The resonance frequency adjustment module includes a movable electrode; a fixed electrode facing the movable electrode to form a capacitor; and an elastic body supporting the movable electrode so as to be displaceable in one direction.

System and driving a low frequency speaker


A control circuit configured to control a speaker is disclosed. The control circuit is configured to drive the speaker at a predetermined frequency that may correspond to a resonance frequency.
Gentex Corporation


Wireless power transmission system, and controlling transmission and reception of resonance power


A resonance power transmission system, and a method of controlling transmission and reception of a resonance power are provided. According to one embodiment, a method of controlling resonance power transmission in a resonance power transmitter may include: transmitting resonance power to a resonance power receiver, the resonance power having resonance frequencies which vary with respect to a plurality of time intervals; and receiving, from the resonance power receiver, information regarding the resonance frequency having the highest power transmission efficiency among the resonance frequencies used in the time intervals..
Samsung Electronics Co., Ltd.


Dielectric filter, transceiver, and base station


Embodiments relate to the field of technologies of components of communications devices, and provide a dielectric filter, which resolves a problem that a solid dielectric filter has a difficulty in implementing capacitive coupling. The dielectric filter includes at least two dielectric resonators, where each of the dielectric resonators includes a body made of a solid-state dielectric material, and an adjusting hole located on a surface of the body.
Huawei Technologies Co., Ltd.


Resonant circuit with variable frequency and impedance


A resonant circuit comprises an input terminal and an output terminal and at least: a group of n resonators, where n≧1, the resonators having the same resonance frequency and the same antiresonance frequency; a first and a second impedance matching element having a non-zero reactance, the first element being in series with the group of resonators, and the second element being in parallel with the group of resonators, the resonant circuit comprising: first means for controlling the group of resonators, enabling the static capacitance of the group to be fixed at a first value; second control means, enabling the impedance of the first impedance matching element and that of the second element to be fixed at second values; the first and second values being such that the triplet of values composed of the static capacitance of the group, the impedance of the first element, and the impedance of the second element can be used to determine the following triplet of parameters: the characteristic impedance zc of the assembly formed by the group, the first impedance matching element and the second matching element; the resonance frequency ωr of the assembly; the antiresonance frequency ωa of the assembly, in order to stabilize the impedance of the circuit at a chosen characteristic impedance.. .
Commissariat A L'energie Atomique Et Aux Energies Alternatives


Optical closed loop microresonator and thyristor memory device


A semiconductor device that includes an optical resonator spaced from a waveguide structure to provide for evanescent-wave optical coupling therebetween. The optical resonator includes a closed loop waveguide defined by an epitaxial layer structure that includes at least one quantum well.
Opel Solar, Inc.


Power transfer system, power transmitting device, power receiving device, and power transfer method


A power transfer system includes a power transmitting device and a power receiving device that are opposed to each other with sandwiching a medium therebetween. The power transmitting device transmits electric power at a resonance frequency that is determined by an impedance of an electric power transmission path including the power transmitting device, the power receiving device, and the medium..
Nec Corporation


Acoustic resonator comprising vertically extended acoustic cavity


An acoustic resonator device includes a substrate, a bottom electrode, a piezoelectric layer, and a top electrode. The top electrode includes a first top comb electrode having a first top bus bar and first top fingers extending in a first direction from the first top bus bar, and a second top comb electrode having a second top bus bar and second top fingers extending in a second direction from the second top bus bar, substantially opposite to the first direction, such that the first and second top fingers form a top interleaving pattern.
Avago Technologies General Ip (singapore) Pte. Ltd.


System for monitoring temperature of electrical conductor


A system for monitoring temperature of an electrical conductor (31) enclosed in at least a (semi)conductive layer (13) comprising: a passive inductive unit (20), and a transceiver unit (40) and a control unit (50). The passive inductive unit (20) includes at least one temperature sensitive component and is configured to have a resonance frequency and/or q value that vary with temperature of the electrical conductor (31).
3m Innovative Properties Company


Resonant co2 sensing with mitigation of cross-sensitivities


Various exemplary embodiments relate to a device to measure carbon dioxide (co2) levels, including a first oscillator group comprising a first sensor to measure air pressure, where the first sensor comprises a first sealed membrane, and where the first sealed membrane overlays a sealed first cavity; a second oscillator group including a second sensor to measure the resonance frequency of a second unsealed oscillating membrane, and where the second unsealed membrane overlays a second cavity in contact with the air outside of the second sensor; and a mixer accepting as input a first frequency measurement output from the first oscillator group and a second frequency measurement output from the second oscillator group, outputting the difference of the first frequency measurement and the second frequency measurement, and computing a carbon dioxide measurement based on the difference.. .
Ams International Ag


Antenna apparatus and electronic device including the antenna apparatus


According to one embodiment, an antenna includes a second element that has an end connected to a first point of a first element, and first and second ends kept open, and includes a first portion extending from a feed terminal to the first end, and a second portion extending from the feed terminal and bifurcated at a second point between the first point and the first end. The lengths of the first and second portions are set to substantially ¼ of a resonance frequency, and substantially ¾ of a resonance frequency, severally.
Kabushiki Kaisha Toshiba


Fatigue testing of a test specimen


The invention pertains to a combination of a test rig and test specimen for performing a fatigue test, wherein the test specimen is non-axisymmetric and comprises:—a central element,—a first branch element, which has a longitudinal axis that extends at an angle to the longitudinal axis of the central element,—a joint connecting the first branch element to the central element, which has an in plane bending resonance frequency with an associated in plane bending mode shape, and an out of plane bending resonance frequency with an associated out of plane bending mode shape, wherein the in plane bending resonance frequency and the out of plane bending frequency are substantially the same, wherein the first node of the in plane bending mode shape and the first node of the out of plane bending mode shape are substantially at the same position at the first branch element and wherein the test rig comprises:—a support for supporting the test specimen,—an excitator for subjecting the test specimen to forced vibration at an excitation frequency.. .
Onderzoekscentrum Voor Aanwending Van Staal N.v.


Method for charging a vehicle battery by induction


The invention relates to a method for charging a vehicle battery by induction from a charging device including a charge transmitter including a primary coil l1 and an inverter capable of supplying the primary coil l1 with an ac supply voltage e. Said device also includes a charge receiver including a secondary coil l2 arranged in a vehicle.
Schneider Electric Industries Sas




Resonance Frequency topics:
  • Resonance Frequency
  • Circuit Switch
  • Addressing
  • Signal Processing
  • Low Frequency
  • Ultrasonic
  • Transducer
  • Piezoelectric
  • Shift Module
  • Frequency Band
  • Blood Pressure
  • Wireless Power
  • Circuit Switching
  • Fault Detection
  • Ground Fault Detection Circuit


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