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8155639 |
System and method for computer noteboook electromagnetic compatibility analysis
A system and method for antenna analysis and electromagnetic compatibility testing in a wireless device utilizes a “parent” device that undergoes rigorous conventional testing. A “child” device ...
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7936175 |
Full function test for in situ test of sensors and amplifiers
The present invention provides a method and an apparatus for in situ test of transducers comprising sensing elements and associated conditioning preamplifiers. The invention makes it possible to...
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7832093 |
Method of creating an electro-mechanical energy conversion device
There are provided methods for creating energy conversion devices based on the giant flexoelectric effect in non-calamitic liquid crystals. By preparing a substance comprising at least one type of...
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7768276 |
Systems and methods for identifying problems with PZT elements of micro-actuators
Systems and methods for identifying problems with PZT elements of micro-actuators are provided. In certain example embodiments, a voltage (e.g., a sine voltage) may be applied to a reference unit...
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7679460 |
Crystal oscillator tester
A crystal oscillator tester includes first and second test pins, first and second transistors, an indicator, a first diode, and first-third capacitors. The first test pin is connected to a power...
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7646190 |
Stress measurement device and stress measurement method
A stress measurement device includes a current supply portion; a series circuit which is connected to the current supply portion and has a piezoresistive element that forms a single gauge...
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7621028 |
Method for optimized dematching layer assembly in an ultrasound transducer
A method for manufacturing an acoustical stack for use within an ultrasound transducer comprises using a user defined center operating frequency of an ultrasound transducer that is at least about...
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7616013 |
Micromechanical positional state sensing apparatus method and system
A micromechanical device may include one or more piezoresistive elements whose electrical resistance changes in response to externally or internally induced strain. The present invention leverages...
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7564251 |
Method for identifying analog measuring sensors and associated assembly
Individual measuring sensors each have a different specific signal type and must therefore be appropriately connected to the analog measuring inputs. An adjustable voltage with adjustable current...
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7525324 |
Inspection method, inspection apparatus, and polarization method for piezoelectric element
A method for inspecting a piezoelectric element includes first-inspection-signal application step of applying to the piezoelectric element a first inspection signal Vp(1) having a first...
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7132942 |
Method and apparatus for detecting a target material in a sample by pre-screening the sample for piezoelectric resonance
A method and apparatus for screening samples to determine which samples include a target material. Generally, the samples are pre-screened to determine which of the samples have a piezoelectric...
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7042228 |
Transducer in-situ testing apparatus and method
The present invention is directed to an apparatus and method for a measurement system for the testing of transducers, and more particularly to the testing of piezoelectric transducers. The...
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6998615 |
Method for evaluating piezoelectric fields
In a method of evaluating a piezoelectric field, non-destructive spectrometry of piezoelectric fields is performed in a semiconductor heterojunction using a technique different from PR...
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6975123 |
Method and apparatus for calibrating piezoelectric driver in dual actuator disk drive
A method and apparatus are disclosed which are operable to determine a capacitance associated with at least one piezoelectric element in an dual actuator disk drive. The capacitance information is...
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6972553 |
Sensor readout circuit
A sensor readout circuit which provides a frequency signal output including a phase detector circuit responsive to an output signal from a sensor and an input signal to the sensor and configured to...
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6965272 |
Worldwide marketing logistics network including strategically located centers for frequency programming crystal oscillators to customer specification
A worldwide logistics network includes a processing center for receiving customer orders for crystal oscillators over communications links, processing the orders, and generating work orders that...
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6937034 |
Absolute value calculating element for converting AC signals into DC signals
A sensor element formed of PZT is overlapped onto an actuator formed of electrostrictive elements, and both members are pinched between a rigid body that is not deformed. By impressing an...
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6880213 |
Method for screening piezoelectric transformer apparatus
A method for quickly screening piezoelectric transformer apparatuses having low mechanical strength and latent defects is performed by connecting a load impedance to a generator of a piezoelectric...
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6870377 |
Method for detecting piezoelectric element failures in head suspensions
Method and apparatus for detecting failure in a piezoelectric element on a head suspension for a disk drive by clamping one end of the suspension, mechanically displacing and rapidly releasing the...
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6861854 |
Peizoelectric microactuator and sensor failure detection in disk drives
A test device and method for testing one of a disk drive microactuator and a disk drive sensor that includes two piezoelectric elements. The test device includes a signal generator, signal...
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6771083 |
Poole-frenkel piezoconductive element and sensor
A new class of highly sensitive piezoconductive strain sensor elements and sensors has been invented. The new elements function under conditions such that electrical conductivity is dominated by...
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6691387 |
Method of using a two-dimensional transducer array
A method of manufacturing a two-dimensional ultrasound transducer array is provided in which the transducer array is formed by a plurality of transducer elements sequentially arranged in the...
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6680620 |
Method for timed measurements of the voltage across a device in the charging circuit of a piezoelectric element
A method for timed measurement of a voltage across a device in a charging circuit of a piezoelectric element. The voltage across the device is sensed and read at a predefined time in...
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6556028 |
Method and apparatus for detecting defects in piezoelectric actuators
Roughly described, piezoelectric actuators are tested as part of an assembly using a three-stage process. In the first stage, a substantially steady state electromechanical potential is induced...
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6531884 |
Diagnostics for piezoelectric sensor
A diagnostic device for testing a piezoelectric sensor includes an AC source configured to apply an AC signal to the piezoelectric sensor at two or more different frequencies. The response of the...
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6521166 |
Method of polarization-treating piezoelectric body
A DC voltage is applied to a piezoelectric body for polarization treatment in the air and in an atmosphere with a temperature equal to or higher than an aging temperature, and then, the...
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6518778 |
Method of determining angle-of-cut
Methods are included for determining deviations from φ=0° in test resonators based on the quasi-pure modes' displacement ratio variations with φ angle. A direct relationship between deviation fr...
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6507202 |
Sensed-pressure-data converter
A sensed-pressure-data converter having a circuit for reducing a fluctuation of the output due to a fluctuation of a resistance and a resistance changing characteristic of a pressure sensitive...
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6498501 |
Measuring circuit
A measuring circuit includes a symmetric transmission line connecting a transducer to a measurement amplifier and to a fault indicating signal amplifier, the transducer delivering symmetric input...
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6480073 |
Method of evaluating quality of crystal unit
A method of evaluating quality of a crystal unit, capable of performing quantitative measurement of an actual operation of a crystal unit which is to be oscillated in an actual oscillator to ensure...
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6480010 |
Method of inspecting piezoelectric ceramic device
A piezoelectric ceramic device is heated so that the temperature is increased to a temperature in the vicinity of the maximum temperature at which the device, when the temperature is returned to...
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6348795 |
Crystal resonant frequency sensor
A method for determining a resonant frequency of a mechanical device having a first mass and at least one second mass mechanically coupled to the first mass comprises the steps of: providing a...
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6321588 |
Chemical sensor array
A device for detecting chemical substances includes a plurality of sensors arranged in an array. The sensors are connected to respective oscillator circuits which drive the sensors, and the...
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6320471 |
Method and device for computer supported determination of an oscillating region of an electrical circuit
An electrical circuit having an oscillator and additional structural elements that are connected to the oscillator. In an iterative method, upon variation of circuit parameters of the additional...
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6236276 |
Method for seeking and setting a resonant frequency and tuner operating according to the method
In a method for seeking and setting a resonant frequency for a load impedance and a tuner for carrying out the method, a first frequency sweep is performed over a predetermined frequency interval...
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6208153 |
System for fast piezoelectric-resonator parameter measurements
Method and apparatus are described for speeding parameter measurements of piezoelectric-resonators. A large driving voltage is applied to the resonator until the resonator current reaches its...
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6154037 |
System and method for testing distortion in transformers
The present invention entails a circuit and method for determining the distortion created by a transformer used in data communications. The circuit according to the present invention comprises a...
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6107791 |
Non-disturbing electric field sensor using piezoelectric and converse piezoelectric resonances
This invention relates to an electric field sensor for near field measurement. The electric field sensor of the present invention uses both piezoelectric and converse piezoelectric resonances....
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5959505 |
Crystal oscillator for measuring crystal impedance of a crystal unit
A crystal oscillator for measuring crystal impedance (CI) easily and accurately of various crystal units having an oscillating frequency in a wide band and various CI-values in a broad rage. A DC...
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5777550 |
High reliability instrument system
A high reliability instrument system includes means for applying a test condition to the instrument and for determining whether the instrument properly responds to the test condition, and means for...
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5767682 |
Electric conductivity measurement circuit and probe
In an electric conductivity measurement circuit according to the invention, there are provided first and second cores for forming a closed flux loop in a liquid whose electric conductivity is to be...
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5764068 |
Method for measuring mechanical properties of thin films using a resonator in an anti-resonance regime
A method using quartz resonators probes dynamically the mechanical characteristics of thin films. This method probes the film properties at the anti-resonance frequency where the vibrational...
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5646541 |
Apparatus and method for measuring circuit network
A circuit network measuring apparatus applies a measurement signal from a signal source to a device under test and measures circuit parameters of the device under test from the measurement signal...
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5594354 |
Method for measuring selected frequencies of a coupled-dual resonator crystal
The present invention discloses a method for obtaining frequency parameters to determine the resonator frequencies, the synchronous peak separation frequency, and the normal center frequency of a...
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5587663 |
Method for measuring the inductance of each resonator of a coupled-dual resonator crystal
The present invention discloses a method for obtaining frequency parameters to determine the resonator inductances of a crystal. Under this method, a plurality of frequencies are applied to a first...
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5577308 |
Method of rotating a Bechmann curve of a quartz strip resonator
A method of rotating a non-temperature compensated Bechmann curve of a quartz strip. The method includes the steps of determining (102) whether a crystallographic orientation of an AT cut quartz...
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5451884 |
Electronic component temperature test system with flat ring revolving carriage
A carriage or dielectric disk (40) has a series of electrical contacts (46, 48) defined by conventional circuit board techniques on upper and lower surfaces around a peripheral edge. Sockets (42,...
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5444641 |
Admittance-parameter estimator for a piezoelectric resonator in an oscillator circuit
Equivalent circuit parameters of a piezoelectric resonator are measured in order to precisely control the amplitude and/or frequency of oscillation of an oscillator including the resonator, or to...
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5426374 |
Piezoelectric body polarizing apparatus
A piezoelectric body polarizing apparatus including a DC power supply 2 for applying a DC voltage to a piezoelectric body 1 to polarize the piezoelectric body 1, an impedance measuring circuit 4...
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5369420 |
Method of testing multi-channel array pulsed droplet deposition apparatus
This invention relates to a method of testing multi-channel array pulsed droplet deposition apparatus (10) comprising a multiplicity of parallel channels (12) each with pulse imparting means for...
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