|| List of recent Resonance Frequency-related patents
|Method and apparatus providing wave division multiplexing optical communication system with active carrier hopping|
A wave division multiplexing (wdm) system is disclosed which accommodates shifts in the resonant frequency of optical modulators by using at least two carriers per optical communications channel and at least two resonant modulator circuits respectively associated with the carriers within each optical modulator. A first resonant modulator circuit resonates with a first carrier and a second resonates with a second carrier when there is a shift in resonance frequency of the at least two resonant optical modulator circuits.
A transformer sub-circuit for use in an electrically operated vehicle includes a bridge circuit which has at least four mosfets and capacitors connected in parallel with the mosfets, and an inductor connected to the bridge circuit for use as a primary side of a transformer. A control device or controller for the inverter is configured to cause switching of the mosfets in such a way that operation is performed at a frequency that is higher than the resonance frequency..
|Determining fracture length via resonance|
A system and method to determine a length of a fracture induced from a borehole are described. The method includes isolating a portion of the borehole, the portion of the borehole including an end of the fracture at the borehole wall, increasing fluid pressure in the portion of the borehole, deploying a low-frequency source in the portion of the borehole, and varying a frequency of the low-frequency source to generate resonance oscillations at a resonance frequency in the fracture.
|Inertially operated piezoelectric energy harvesting electronic circuitry|
An electrical energy harvesting device for harvesting electrical energy from a pulsed impact loading event. The device including: a piezoelectric element configured to be loaded and unloaded to a first load level by the pulsed impact loading event; and a first inductor coupled to the piezoelectric element configured to be loaded and unloaded to a second load level by the pulsed impact loading event, wherein the piezoelectric element and the first inductor together operate as a first inductor/capacitor (lc) resonant circuit having a first resonance frequency and wherein the loading of the first inductor lags in time the loading of the piezoelectric element..
|Pressure sensor using mems resonator|
A pressure sensor including: a mems resonator; a sweeping unit which sweeps a frequency of an excitation signal in a predetermined direction of sweeping, over a predetermined frequency range including a resonance frequency f0 of a vibrator in the mems resonator, while outputting the excitation signal to the mems resonator; an integrating unit which inputs a vibrating-state information signal as a characteristic amount indicative of a vibrating state of the vibrator from the mems resonator while the sweeping unit sweeps the frequency, integrates a plurality of the vibrating-state information signals at different frequencies of the excitation signal, and outputs the integrated value; and a conversion unit adapted to determine a pressure acting on the mems resonator, based on the integrated value.. .
|An acoustic ceiling for a capacitive power transfer system|
An acoustic ceiling tile (200) operating as a capacitive power transfer sys tem comprises a first layer (231) comprising a non-conductive material; at least a pair of receiver electrodes (220, 221) of the capacitive power transfer system configured on a first side of the first layer; a foam layer (240) having a side substantially covered with the first layer; and a load (210) connected to an inductor (212) and to the pair of receiver electrodes, wherein the load and the inductor are configured in a chamber formed between the first layer and the foam layer, wherein a power signal generated by a power driver is wirelessly transferred from a pair of transmitter electrodes to the pair of receiver electrodes (220, 221)to power the load when a frequency of the power signal substantially matches a series-resonance frequency of the inductor and a capacitive impedance created between the pair of receiver electrodes and the pair of transmitter electrodes.. .
|Method of designing semiconductor integrated circuit|
A method of designing a semiconductor integrated circuit, includes inserting, between a power supply voltage and a ground voltage, at least two types of capacitor cells which have a different ratio, the ratio being between an inverse number of a capacitance value of a capacitative element and a resistance value of an equivalent series resistance, such that an impedance between the power supply voltage and the ground voltage in a resonance frequency according to capacitances of the at least two types of capacitor cells and an external inductance, and an impedance between the power supply voltage and the ground voltage in a target frequency, are near respective desired values or less than or equal to the respective desired values.. .
|Antenna structure and wireless communication device using the same|
An antenna structure includes a feed portion, a ground portion, a first radiating body, a second radiating body and a third radiating body. The first radiating body is connected to the feed portion and configured to obtain a first resonance frequency band.
|Transparent capacitive wireless powering system|
A transparent capacitive powering system (200) is disclosed. The system comprises a pair of receiver electrodes (241, 242) connected to a load (250) through an inductor (260), wherein the inductor is coupled to the load to resonate the system; and a transparent infrastructure (220) having at least a first layer (130) of a non-conductive transparent material and a second layer (120) of a conductive transparent material coupled to each other, wherein the second layer is arranged to form a pair of transmitter electrodes (221, 222), wherein the pair of receiver electrodes are decoupled from the second layer, thereby forming a capacitive impedance between the pair of transmitter electrodes and the pair of receiver electrodes, wherein a power signal generated by a driver (210) is wirelessly transferred from the pair of transmitter electrodes to the pair of receiver electrodes to power the load when a frequency of the power signal substantially matches a series-resonance frequency of the first inductor and the capacitive impedance..
|Actuation system for a resonant linear compressor, method for actuating a resonant linear compressor, and resonant linear compressor|
An actuation system for a resonant linear compressor (50), applied to cooling systems, the latter being particularly designed to operate at the electromechanical frequency of said compressor (50), so that the system will be capable of raising the maximum power supplied by the linear actuator, in conditions of overload of said cooling system. Additionally, an actuation method for a resonant linear compressor (50) is disclosed, the operation steps of which enable one to actuate the equipment at the electromechanical resonance frequency, as well as to control the actuation thereof in over load conditions..
|Suspension structure of multi-functional type vibration actuator|
Provided is a multi-functional type vibration actuator capable of stabilizing a vibration characteristic and improving variation in a resonance frequency by matching vibration waveforms when increasing/reducing an input signal frequency, by using a frame-shaped suspension of a polygonal shape. A spring characteristic of the frame-shaped suspension may be improved by forming j-shaped structures which is formed by connecting an extension portion and an arc, on all corner portions of the frame-shaped suspension of the polygonal shape, whereby reducing variation in a vibration waveform and a resonance frequency when sensible vibration is generated..
|Wireless communication device, display apparatus, television receiver and method for adjusting resonance frequency|
In a wireless communication device having a sheet-like antenna 41 and a first and second covers 42, 43 covering the antenna 41, a dielectric first rib 42a that is in contact with the antenna 41 is provided on the antenna 41 side of the first cover 42. The method for adjusting a resonance frequency is as described below.
|Dual band antenna|
A dual-band antenna, disposed in a substrate, is provided. The dual-band antenna includes: a feeding part and a slot antenna.
|Position indicator and capacitor|
A position indicator includes a resonance circuit housed in a casing and having an inductance element and a capacitor variable in capacitance, such that the resonance circuit resonates at a predetermined frequency. The position indicator is electromagnetically coupled to a position detecting device.
|Power transmitting device, power receiving device, and non-contact charging method|
In a non-contact charging method, variable information with which a resonance frequency of a resonance circuit of an equipment device having maximum charging power as the power transmitting frequency, and a resonance frequency or a q value of a resonance circuit of a power receiving unit of an equipment device other than the equipment device having the maximum charging power as a resonance frequency or a q value for charging depending on each charging power, and transmits to each equipment device variable information corresponding to each equipment device.. .
|Monolithic energy harvesting system, apparatus, and method|
An energy harvesting device utilizing a monolithic, mesoscale, single-degree-of-freedom inertial based resonator in which the support structure, beam-spring, and proof mass are a single component without joints, bonds, or fasteners. Frequency tuning features include holes in the proof mass in which mass can be added to change the devices resonance frequency as well as levers which add curvature to the beam-spring system and adjust system stiffness.
|Wireless power converter utilized as a capacitive power transfer system|
A direct current (dc) to alternating current (ac) wireless converter apparatus (200) for supplying power to a load connected in a capacitive power transfer system. The apparatus comprises at least two connectors (201, 202) enabling a galvanic contact to at least two supply lines (211, 212) of a dc grid; a driver (203) coupled to the connectors (201, 202) and configured to generate an ac power signal from an input dc signal fed by the at least two connectors, wherein a frequency of the ac power signal substantially matches a series-resonance frequency of the capacitive power transfer system; and at least a pair of transmitter electrodes (204, 205) connected to an output of the driver..
|Method, apparatus and system for providing metering of acceleration|
Techniques and mechanisms to provide for metering acceleration. In an embodiment, a microelectromechanical accelerometer includes a magnet, a mass, and a first support beam portion and second support beam portion for suspension of the mass.
|Piezoresistive nems array network|
A sensor for detecting analytes, a method of making the sensor, and a method of using the sensor. In one embodiment, the present invention comprises at least one array comprising a plurality of resonators.
|Downhole fluid tracking with distributed acoustic sensing|
Various disclosed distributed acoustic sensing (das) based systems and methods include embodiments that process the das measurements to detect one or more contrasts in acoustic signatures associated with one or more fluids flowing along a tubing string, and determine positions of the one or more contrasts as a function of time. The detected contrasts may be changes in acoustic signatures arising from one or more of: turbulence, frictional noise, acoustic attenuation, acoustic coupling, resonance frequency, resonance damping, and active noise generation by entrained materials.
|Tunable impedance network|
A tunable impedance network and a method for tuning the tunable impedance network are disclosed. In one aspect, the tunable impedance network comprises a plurality of transformers connected in series.
|Angular velocity detecting device|
A high-performance angular rate detecting device is provided. A driving part including a drive frame and a coriolis frame is leviated by at least two fixing beams which share a fixed end and are extending in a direction orthogonal to a driving direction, thereby vibrating the driving part.
|Projection controlling method and mems projection apparatus|
A projection controlling method for controlling a mems scanning mirror to repeatedly scan an image light on a surface and form a projection image is provided. A resonance frequency of the mems scanning minor which swings around a first swing axis is detected and provided to a filter unit as a parameter of a filtering process.
|Nanostructure diffraction gratings for integrated spectroscopy and sensing|
The present disclosure pertains to metal or dielectric nanostructures of the subwavelength scale within the grating lines of optical diffraction gratings. The nanostructures have surface plasmon resonances or non-plasmon optical resonances.
|Resonant circuit with automated trimming capabilities|
According to an example embodiment, a device includes a resonant circuit configured and arranged to provide a peak current flow at a resonance frequency. A trimming circuit provides variable impedances to the resonant circuit and thereby changes the resonance frequency for the resonant circuit.
|Frequency altering brace for an electric motor|
A support brace for a motor enables altering the stiffness and reed critical frequency of a motor system without removal of the motor from a motor stand or support structure. The support brace includes a first flange configured to mount to an electrical motor housing, and a second flange configured to mount to a supporting fixture.
|Method for controlling a mechanical vibrating element|
A method for controlling a mechanical vibrating element driven by a driving means includes operating the driving means at an operation frequency for stimulating the vibrating element to oscillate at this frequency. The method also includes adjusting the operation frequency of the driving means for stimulating the vibration element at different frequencies and of determining a respective energy consumption of the driving means depending on the frequency at which the vibrating element oscillates.
|Bistable force and/or acceleration sensor|
A technique is provided for determining a force/acceleration acting on a proof mass of a bistable device. According to an aspect of the invention, the location of a boundary of one of the stable configurations of the device is monitored.
|Drive control method of electrostatic-type ultrasonic transducer, electrostatic-type ultrasonic transducer, ultrasonic speaker using electrostatic-type ultrasonic transducer, audio signal reproducing method, superdirectional acoustic system, and display|
A push-pull-type electrostatic-type ultrasonic transducer includes a first electrode having through holes, a second electrode having through holes each of which is paired with the corresponding through hole of the first electrode, and an oscillation film sandwiched between a pair of the first and second electrodes and having a conductive layer to which direct current bias voltage is applied. When a wavelength obtained from a resonance frequency at a mechanical oscillation resonance point of the oscillation film is λ, a thickness t of the respective fixed electrodes is (λ/4)·n or substantially (λ/4)·n (where λ: wavelength of ultrasonic wave, n: positive odd number).
|Power supplying apparatus and power charging apparatus|
There are provided a power supplying apparatus controlling voltage of a power factor correcting circuit according to a power state and a power charging apparatus controlling voltage of a power factor correcting circuit according to a charging state of a battery. The power supplying apparatus includes: a power factor correcting circuit switching input power to correct a power factor thereof and adjusting a voltage level of the power of which the power factor has been corrected according to a state of power transferred to a load; and a resonant dc to dc converting circuit having a resonance frequency varied according to a voltage level of dc power from the power factor correcting circuit and converting the dc power from the power factor correcting circuit into supply power having a preset level according to the resonance frequency..
|Wireless power transmission system capable of continuing power transmission while suppressing heatup of foreign objects|
A power transmitting antenna includes a first resonant circuit including a power transmitting coil, a power receiving antenna includes a second resonant circuit including a power receiving coil. When the power transmitting antenna and the power receiving antenna are electromagnetically coupled to each other, the power transmitting antenna and the power receiving antenna have an odd-mode resonance frequency corresponding to an odd-mode resonant condition, and an even-mode resonance frequency corresponding to an even-mode resonant condition, and the even-mode resonance frequency is higher than the odd-mode resonance frequency.
|Single-protein nanomechanical mass spectrometry in real time|
Methods and devices relating to measuring a landing position and mass of an analyte adsorbed to a nanomechanical resonator by resolving adsorbate-induced frequency shifts in at least two modes of a resonator resonance frequency, where during the resolving of the frequency shifts in the at least two modes analysis is so that the transformation (g) from the fractional-frequency shift pair to the analyte mass-position pair is one-to-one. Complex protein mixtures can be analyzed at high sensitivity and resolution..
|Image projection method and mems image projection apparatus|
An image projection method and a microelectromechanical system (mems) image projection apparatus are provided. The image projection method controls a mems scanning mirror swinging around a first swing axis to project an image light beam.
|Magnetic resonance imaging method and apparatus|
A magnetic resonance imaging (mri) method and apparatus are provided including a signal acquirer, a resonance frequency acquirer, and an rf driver. The signal acquirer is configured to acquire a free induction decay (fid) signal or an echo signal to generate a magnetic resonance image of a portion of an area of a subject.
|Capacitive wireless power inside a tube-shaped structure|
A capacitive powering system constructed to enable wireless power transfers inside a tube-shaped structure (200) includes a capacitive tube (220) including a pair of receiver electrodes (223, 224) connected to a load (221) through a first inductor (222), wherein the first inductor is coupled to the load to resonate the system; a transmitter device (210) including a pair of transmitter electrodes (213, 214) connected to a power driver(211);and an insulating layer (230) for electrically insulating the capacitive tube from the transmitter device to form a capacitive impedance between the pair of transmitter electrodes and the pair of receiver electrodes, wherein a power signal generated by the power driver is wirelessly transferred from the pair of transmitter electrodes to the pair of receiver electrodes to power the load when a frequency of the power signal substantially matches a series-resonance frequency of the first inductor and the capacitive impedance.. .
|Dynamic damper for vehicle|
A dynamic damper mounted within a vehicle is capable of tuning a resonance frequency for each direction and includes a housing formed by a vertical plate connected to a bottom plate. A first rubber having elasticity is seated on the bottom plate and a mass is seated on the first rubber in a vertical direction and is spaced apart from the vertical plate.
|Method of determining the longitudinal pitch of blocks of a tread band and tread band|
Method of determining the longitudinal pitch of blocks of a tread band having a raised pattern with a number of longitudinal grooves and transverse grooves; the method including the step of calculating a best longitudinal pitch of the blocks, to minimize pass-by noise at a given target speed, as a function of the resonance frequency of the longitudinal grooves and an integer greater than zero.. .
|Non-contact power supply system|
A non-contact power supply system includes a power supply device and a power reception device. The power supply device includes primary coils arranged on a power supply surface and configured to be excited at an operational frequency.
|Wireless power transmission method|
A wireless power transmission method transmits power from a first resonance antenna to a second resonance antenna in a noncontact manner through resonance of a magnetic field. The first resonance antenna is a resonance antenna of a power transmitting device, the second resonance antenna is a resonance antenna of a power receiving device.
|Inductive sensor for a motor vehicle, comprising electric oscillators designed to form an ac voltage at the terminals of a field coil by means of electric resonance|
At least two electric circuits (111) connected simultaneously in parallel to the terminals of the field coil (101), each electric circuit (111) including an inverter element (112) and a capacitive element (113), and forming, together with the field coil (101) an electric oscillator (110) designed to form an ac voltage at the terminals of the field coil (10) via electric resonance, the electric oscillators (110) being of the same resonance frequency.. .
|Power transmission system for vehicle|
A power transmission system for a vehicle includes a bowl-shaped peripheral wall for housing a power transmission member and a structure is provided to inhibit a circular standing wave mode that is generated in the bowl-shaped peripheral wall during power transmission. A resonance frequency [f] is increased in a surface of a bowl-shaped peripheral wall that is provided with a rib while the resonance frequency [f] is reduced in a surface of the bowl-shaped peripheral wall that is provided with a mass.
|Method of carrying out a vibratory fatigue test of a mechanical part|
A method of carrying out a vibratory fatigue test of a mechanical part having a fatigue endurance limit, the part including a repair extending partly on a first zone of the part, the method including a preliminary test phase including: selecting a loading mode of the part; determining a cutting of the part defining a truncated part, the cutting of the part being defined to obtain a loading level in the repaired zone equal to the maximum value of an abatement to be validated; selecting a measuring device for the fine control of the fatigue test by the measurement of a stress applied to a point of the part; determining a resonance frequency of the truncated part according to the selected loading mode; implementing a loading according to the selected mode at a given level of the truncated part at the resonance frequency up to rupture of the part.. .
|Tire pressure decrease detection apparatus, method, and computer readable medium therefor|
An apparatus for detecting a decrease in tire pressure based on a resonance frequency of a tire installed in a vehicle includes rotation information detection means for detecting rotation information of the tire, resonance frequency estimate means for estimating the resonance frequency of the tire from the rotation information of the tire, and judgment means for judging the decrease in the tire pressure by comparison between the resonance frequency estimated by the resonance frequency estimate means and a reference frequency preliminarily determined by learning at the time of initialization. An effective speed region when the reference frequency is determined at the time of the initialization is a first speed or less.
|Methods and apparatus for porting loudspeakers to an earpiece|
A hand-held electronic device includes an earpiece, a first speaker having a first primary audio output ported to the earpiece, a second speaker having a second primary audio output and a second bass reflex output, with the second bass reflex audio output also being ported to the earpiece. The device includes a use case manager configured to determine a mode of operation of the device, and a controller configured to drive the first and second speakers in either a broadcast mode or a private mode in response to a signal from the use case manager.
|Using millisecond pulsed laser welding in mems packaging|
A new packaging method for a wide range of mems for application on both the wafer and device scale. Titanium is used as the packaging material and both silicon and titanium mems devices are integrated on to a titanium substrate.
|Method for measuring mechanical resonance frequency using servo driver|
A method of measuring mechanical resonance frequency using a servo driver including the steps of: having the servo driver work under a torque control mode, by applying in the servo driver a preset torque drive signal, the motor drives the mechanical components in a microvibration state; collecting actual speed signals of the motor to obtain the actual speed signal sequence of the motor; the actual speed signal sequence of the motor being passed in sequence through a certain number of band-pass filters having a fixed pass-band frequency and different center frequencies to obtain filtered speed signals; the filtered speed signal sequences output from each of the band-pass filters being changed into absolute values and then accumulated to obtain accumulation values; comparing the accumulation values obtained from the signal sequences output from the certain number of band-pass filters, and the center frequency of the band-pass filter corresponding to the largest accumulation value being the mechanical resonance frequency. By using the method, an automatic measurement of the mechanical resonance frequency of a mechanical device can be achieved..
|Micromachined ultrasonic transducer arrays with multiple harmonic modes|
Micromachined ultrasonic transducer (mut) arrays capable of multiple resonant modes and techniques for operating them are described, for example to achieve both high frequency and low frequency operation in a same device. In embodiments, various sizes of piezoelectric membranes are fabricated for tuning resonance frequency across the membranes.
|Actuator and electric beauty appliance|
An actuator includes a movable body including a cylindrical magnet having on a circumferential surface thereof alternating n and s pole faces along a circumferential direction thereof. An immovable body includes pole teeth arranged along the circumferential direction so as to face the circumferential surface of the magnet and that are equal in number to the n pole faces and the s pole faces, and a coil that receives an alternating current of a frequency substantially equal to a resonance frequency of the movable body to excite the pole teeth to have alternately different polarities in the circumferential direction.
A driving apparatus (100) is provided with: a first base part (110-1); a second base part (110-2); a first elastic part (120a-1, 120b-1); a driven part (130); a second elastic part (120a-2, 120b-2); and an applying part (160) which is configured to apply, to the second base part, an excitation force for rotating the driven part such that the driven part rotates while resonating around the axis along the one direction, at a resonance frequency determined by the second elastic part and the driven part, the applying part applies the excitation force such that the second base part vibrates and deforms in a shape of stationary wave along the another direction and the deformational vibration becomes resonance, the resonance frequency at which the second base part resonates is same as a resonance frequency of the driven part.. .
|Wireless power transmission/reception apparatus and method|
Disclosed herein is a wireless power transmission/reception apparatus. The wireless power transmission/reception apparatus includes a wireless power transmission unit and a wireless power reception unit.
|Wireless power transmission/reception apparatus and method|
Disclosed herein is a wireless power transmission/reception apparatus. The wireless power transmission/reception apparatus includes a wireless power transmission unit and a wireless power reception unit.
|Method of designing power feeding system and power feeding system|
Disclosed is a method of designing a power feeding system achieving critical coupling at a desired resonance frequency without adjusting a size or a distance of a coil, and thus obtain high transmission efficiency over broad band. The method includes designing impedances of the power feeding and the power receiving unit to be small as a resonance frequency between the power feeding helical coil and the power receiving helical coil becomes small by adjusting impedances of the dc/ac converter and the ac/dc converter..
|Ultrasonic irradiation apparatus and method for irradiating ultrasonic wave|
An ultrasonic irradiation apparatus irradiates an ultrasonic wave to a target portion where micro bubbles or micro grains which reflect or scatter an ultrasonic wave exist. The apparatus includes an input unit, a drive signal setting unit, and an ultrasonic emission unit.
|On-chip optical reference cavity exhibiting reduced resonance center frequency fluctuations|
An optical apparatus comprises a waveguide substrate and an optical reference cavity. The optical reference cavity comprises an optical waveguide formed on the waveguide substrate and arranged to form a closed loop greater than or about equal to 10 cm in length.
|Light scanning device and display apparatus|
Provided is a light-scanning device may be designed to have a high resonance frequency and a large scanning angle. A mirror unit vibrates by using an arbitrary straight line as a rotation axis.
Provided is a piezoelectric oscillator to attain high-frequency performance and frequency stabilization with the use of reflection characteristics of a reflective element. A piezoelectric oscillator is configured such that a resonant circuit is connected to a gate of a field effect transistor; an output terminal is connected to a drain and a power supply voltage v is applied to the drain; a piezoelectric resonator is connected to a source, as a reflective element; and a resonance frequency of the resonant circuit and an oscillation frequency of the piezoelectric resonator as a reflective element are set to substantially the same frequency, and further, the piezoelectric oscillator may be configured such that a first matching circuit is provided between the resonant circuit and the gate, second matching circuit is provided between the drain and the output terminal, and a third matching circuit is provided between the source and the reflective element..
|Device, system, and method of 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..
|Communication terminal and antenna apparatus thereof|
Disclosed are to a communication terminal and an antenna apparatus thereof. The antenna apparatus includes an antenna device including a feeding point to which a signal is applied; and at least one variable reactance device connected to the antenna device.
|Liquid ejecting apparatus and liquid ejecting method|
A liquid ejecting apparatus includes a reference drive signal generation section that generates a reference drive signal, a signal modulation section that modulates the reference drive signal to generate a modulation reference drive signal, a signal amplification section that amplifies the modulation reference drive signal using switching elements to generate a modulation drive signal, a signal conversion section that converts the modulation drive signal to a drive signal, and a head which includes a piezoelectric element that deforms in response to the drive signal, a pressure chamber that expands and contracts due to the deformation of the piezoelectric element and has a helmholtz resonance frequency of a period tc, and a nozzle opening portion that communicates with the pressure chamber. A period of an alternating current component contained in the modulation drive signal is a divisor of a section of one of the drive signal..
|Detector of gravitational waves and method of detecting gravitational waves|
A semiconductor detector of gravitational waves of a first frequency may include an oscillator having a metal coated oscillating member over a metal coated semiconductor substrate to be subjected to a casimir attraction force towards the semiconductor substrate. The oscillator may be configured to exert a force to counterbalance the casimir attraction force causing the oscillating member oscillates with a main harmonic resonance frequency equal to the first frequency.
|Target clearance measurement device|
A target or rotor blade clearance measurement device is disclosed for indicating an interaction of a measurement probe with a target or rotor blade. In a preferred embodiment, the measurement device comprises a measurement probe containing a coil, a frequency source arranged to apply an input alternating signal to the measurement probe, and a frequency regulator arranged to regulate the input alternating signal at a frequency below the resonance frequency of the measurement probe.
|Integrated magnetic spectrometer for multiplexed biosensing|
A magnetic spectrometer is integrated in a semiconductor substrate and provides high sensitivity without using an external magnet field. The spectrometer includes one or more highly stable on-chip oscillator and lc resonator.
|Vehicle starting apparatus|
There is provided a vehicle starting apparatus that reduces vibration of an engine caused when the engine starts so that vibration of the vehicle can be decreased. A vehicle starting apparatus according to the present invention is provided with an engine starting apparatus that starts an engine mounted in a vehicle, wherein before the engine is ignited, the engine starting apparatus makes a cranking rotation speed of the engine lower than a rotation speed corresponding to the resonance frequency of the engine, and after the engine has been ignited, the engine starting apparatus increases the rotation speed of the engine up to a rotation speed that is the same as or higher than said rotation speed corresponding to the resonance frequency..
|Thermal flow sensor with vibrating element and gas sensor comprising at least one such sensor|
Piezoelectric gauges for detecting the resonance frequency variation of the vibrating element, the gauges forming means for heating the vibrating element by joule effect and the suspension means comprising two beams formed by nanowires so as to reduce the heat losses from the vibrating element toward the support.. .
|System and method for transmitting a radio frequency signal through a speaker coil|
In accordance with an embodiment, a system has an audio amplifier configured to be coupled to a speaker coil port via a parallel resonant circuit, and a radio frequency (rf) amplifier configured to transmit a rf signal at a first rf transmission frequency. The speaker coil port is configured to be coupled to a speaker coil, and the parallel resonant circuit has a resonance frequency of about the first rf transmission frequency..
|Magnetic induction signal repeater|
A magnetic induction (mi) repeater includes first and second coils configured to have the same resonance frequency and to be substantially isolated from one another, and an amplifier connected to the first and second coils and configured to receive a signal induced in the first coil by a first magnetic field and output, via the second coil, a second magnetic field based on the signal, wherein the second magnetic field is amplified relative to the first magnetic field.. .
|Method and arrangement relating to testing objects|
The invention relates to an arrangement (100, 200, 500) and a method for testing a hold (120, 220, 520), such as an implant, attached to an object (130, 230, 530), such as a bone, the method comprising the steps of: bringing a member (110, 210, 510) into contact with said hold, contactlessly detecting at least one resonance frequency of said member (110, 210, 510) when it is in contact with said hold (120, 220, 510); and interpreting the detected resonance frequency in terms of the degree of attachment of the hold with respect to the object.. .
|Apparatus for controlling resonance frequency of device subject to wireless power transmission interference and method thereof|
Provided is an apparatus and method to control a resonance frequency of a device subject to wireless power transmission interference. The apparatus and method include supplying power from a printed circuit board (pcb) to an integrated circuit (ic) during exposure to a wireless power transmission environment experiencing mutual resonance.
|Magnetic recording assisted by spin torque oscillator with a radio frequency current bias|
A design is disclosed for a microwave assisted magnetic recording device wherein direct current and rf current are simultaneously injected from a bias tee into a spin transfer oscillator (sto) between a main pole and write shield to improve the assist process. The sto oscillation layer (ol) has a large angle magnetization oscillation frequency that is locked to a magnetic medium bit resonance frequency f0 when the rf current has a frequency f=f0 and a threshold current density is applied.
|Magnetic recording assisted by spin torque oscillator with a radio frequency current bias|
A method to tune an oscillation layer frequency in a spin torque oscillator (sto) during a microwave assisted magnetic recording (mamr) process is described. The sto oscillation layer (ol) has a large angle magnetization oscillation frequency that is locked to a magnetic medium bit resonance frequency f0 when the rf current has a frequency f=f0 and a threshold current density is applied.
|Fet switch as detune circuit for mri rf coils|
A radiofrequency (rf) coil assembly for use in magnetic resonance includes a radiofrequency coil (42, 100) and an electronic switch (28) which switches between open and closed states to detune and tune the coil to a preselected resonance frequency. Each electronic switch includes at least one field effect transistor (fet) (70) and a bias network (72)..