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| Number | Title | Issue Date |
| 8063648 | Method and device for demodulation of signals A method and device are provided for demodulation of an output signal from a transducer (1) driven by an alternating excitation signal having an excitation frequency. The transducer produces an amplitude-modulated output signal (y(t)) containing the quantity ... | 11/22/2011 |
| 7453268 | Input power protected ratiometric output sensor circuit MOSFETs are provided to connect the sensor input terminals of a ratiometric output sensor to a pair of power terminals, and the gate of each MOSFET is coupled to the opposite power terminal so that both MOSFETs are rendered conducting to power the sensor when a supp... | 11/18/2008 |
| 7403816 | Method and apparatus for analyzing bioelectrical response waveform information, and diagnostic apparatus thereof A method for analyzing skin response waveform information obtained by measuring skin impedance with a voltage of a predetermined frequency. A current value at the start of polarization caused by the application of the voltage is determined, followed by determining a... | 07/22/2008 |
| 7368923 | Time interval trimmed differential capacitance sensor An apparatus and method for operation of a differential capacitance transducer, including generating substantially opposing polarity excitation drive signals by operation of a pair of drive signal generators, applying the excitation drive signals to a pair of sense ... | 05/06/2008 |
| 7337669 | Inertial sensor and combined sensor therewith An inertial sensor is provided which includes a self-diagnosis circuit which applies an AC-bias signal voltage ahead of a synchronous demodulator, and thereby, supplies a diagnostic signal for detecting an abnormality in at least one of a detecting element and a det... | 03/04/2008 |
| 7221347 | Apparatus and method to improve a response speed of an LCD An apparatus and method thereof to improve a response speed of an LCD includes a noise rejection unit and a comparator. The noise rejection unit rejects noise in current digital image data and previous digital image data at a same pixel position as in the current di... | 05/22/2007 |
| 7184901 | Digitizing electrical measurement system A scheme, including a microcomputer, for measuring physical quantities of a passive component. A programmable sinusoidal signal generator is used for generating the test analog sinusoidal signal. An analog-to-digital conversion system has a first node coupled to the... | 02/27/2007 |
| 7119555 | Circuit for detecting difference in capacitance A circuit for detecting a difference in capacitance between a first capacitor and a second capacitor provided in a sensor includes an oscillator configured to generate an oscillating signal, a phase comparator coupled to the oscillator to output a signal responsive ... | 10/10/2006 |
| 7088112 | Sensor capacity sensing apparatus and sensor capacity sensing method A capacitor C and an impedance converter Hiz are included in a feedback circuit of the first operational amplifier OP1 in series; an electrode P1 of a capacitive sensor is connected to a connection point of the said capacitor and the converter ... | 08/08/2006 |
| 6980141 | Analog input for electronic circuit The invention relates to an analog input for electronic circuit, which input is intended to be connected to an electrical output of a sensor for measuring a physical parameter, the sensor being supplied with a supply voltage Vcc and providing at its electrical outpu... | 12/27/2005 |
| 6949937 | Differential capacitance measurement A circuit and method are given, which realizes a stable yet sensitive differential capacitance measuring device with good RF-suppression and with very acceptable noise features for use in capacitive sensor evaluation systems. By evaluating the difference of capacito... | 09/27/2005 |
| 6906532 | Method for digitally measuring electrical impedance A digital eddy current proximity system including a digital impedance measuring device for digitally measuring the proximity probes impedance correlative to displacement motion and position of a metallic target object being monitored. The system further including a ... | 06/14/2005 |
| 6861852 | Method for measuring a gap between a proximity probe and a conductive target material A digital eddy current proximity system including a digital impedance measuring device for digitally measuring the proximity probes impedance correlative to displacement motion and position of a metallic target object being monitored. The system further including a ... | 03/01/2005 |
| 6826490 | Transducer calibration system: apparatus and method A transducer calibration apparatus and method for transforming both previously established transducer parameters for a transducer calibrated to a first target object material and measured transducer parameters for the transducer monitoring a second different target ... | 11/30/2004 |
| 6756794 | Apparatus for determining a gap between a proximity probe component and a conductive target material A digital eddy current proximity system including a digital impedance measuring device for digitally measuring the proximity probes impedance correlative to displacement motion and position of a metallic target object being monitored. The system further including a ... | 06/29/2004 |
| 6703843 | Device for digitally measuring electrical impedance A digital eddy current proximity system including a digital impedance measuring device for digitally measuring the proximity probes impedance correlative to displacement motion and position of a metallic target object being monitored. The system further i... | 03/09/2004 |
| 6580277 | Device for the ratiometric measurement of sensor signals Device for the ratiometric measurement of sensor signals using an analog/digital converter whose supply voltage is generated by means of a voltage controller, having an operational amplifier which is connected as a voltage follower and whose noninverting ... | 06/17/2003 |
| 6417674 | Two port self-calibration for an N-port network analyzer An n-port network analyzer system is calibrated. An initial calibration is performed for each test port in the network analyzer system by first performing a measurement calibration using calibration standards. The calibration standards are located in a re... | 07/09/2002 |
| 6147501 | Automatic calibration of a network analyzer A radio frequency network analyzer connected to a multi-port test set is calibrated. An initial calibration is performed for each test set port in the multi-port test set. The initial calibration is performed by first performing a measurement calibration ... | 11/14/2000 |
| 5744968 | Ratiometric circuit A ratiometric circuit (40) includes a differential capacitive sensor (42) for sensing a change in capacitance, a differential capacitive detector (46) operatively connected to the differential capacitive sensor for detecting a change in the capacitance of... | 04/28/1998 |
| 5610847 | Ratiometric fourier analyzer A ratiometric Fourier analyzer is provided for determining the frequency components of the output waveforms of electronic circuits by eliminating errors due to aliasing without increasing the time necessary for analysis. Ratiometric Fourier analyzers in a... | 03/11/1997 |
| 5579247 | Method and apparatus for decreasing the interference and noise sensitivity of a ratiometric converter type of circuit A ratiometric converter receives an external sense signal and external reference signal and provides an output signal which is proportional to the sense signal and inversely proportional to the reference signal. Electromagnetic interference and noise coup... | 11/26/1996 |
| 5229726 | Portable device for use in the measurement of a component content of a material A portable device for use in the measurement of the dielectric properties of materials such as fish includes: a microwave circuit comprising a microwave source (10) connected via an isolator (12) to a directional coupler (14), a first output (16) of which... | 07/20/1993 |
| 5113140 | Microprocessor-controlled high-voltage capacitance bridge A current comparator bridge for measuring the value of an unknown capacitor includes a current comparator having a first comparator winding with an adjustable tap which is connected to one side of a standard capacitor and a second comparator winding conne... | 05/12/1992 |
| 5103184 | Capacitive fuel composition sensor with ground isolation A fuel composition sensor for a fuel line carrying a mixture of two fuels provides a fuel composition signal VOUT to an engine control computer having a computer analog reference voltage ECM referenced to a computer ground EGD. The sensor has a sensor ana... | 04/07/1992 |
| 5077527 | Encoding system and method for differential capacitive transducer A transducer system and method of use thereof by sequentially operating a comparator to produce a series of pulses in which the time distribution of the pulses is representative of the transducer value, and is used to normalize the sensed value in the eve... | 12/31/1991 |
| 5075631 | Encoding system and method for differential capacitive transducer A transducer system and method of use thereof by sequentially operating a comparator to produce a series of pulses in which the time distribution of the pulses is representative of the transducer value, and is used to normalize the sensed value in the eve... | 12/24/1991 |
| 5028874 | Ratiometric measurement circuit with improved noise rejection A noise rejection circuit improves the signal-to-noise ratio of a ratiometric measurement circuit. A first operational amplifier produces a scaled-up voltage proportional to a low reference voltage. The scaled-up voltage is applied to a series connected r... | 07/02/1991 |
| 5019781 | Source level control for impedance meter An impedance meter with improved measurement accuracy obtained by controlling the level of the signal source. The impedance meter comprises a signal source, feedback amplifier, synchronous detector, A/D and control logic. The source level is maintaind by ... | 05/28/1991 |
| 5007283 | Method and device for processing measured values In connection with a method and a device for processing measured values, where resistance variations are evaluated as a measure for the variation of the gas concentration to be measured, it is proposed to measure a basic resistance value at least once, pr... | 04/16/1991 |
| 4841227 | Apparatus for the ratiometric measurement of a quantity of liquid in a tank Apparatus for the ratiometric measurement of a quantity of liquid in a tank includes first and second capacitors disposed in a tank and responsive to an AC excitation signal. The output signal from the first capacitor corresponds to the quantity of liquid... | 06/20/1989 |
| 4816745 | Method and arrangement for measuring the resistance ratio in a resistance half-bridge The measuring circuit is used to measure the resistance ratio ƊR/R in a resistance half-bridge comprising two series-connected resistors, of which the one resistor has the resistance R+ƊR and the other resistor the resistance R-ƊR. The two resistances ... | 03/28/1989 |
| 4797603 | Device for measuring the ratio of two low value capacities A device for measuring the ratio between a first capacitor and a second capacitor in which first and second switches are provided for selectively conducting a signal, therethrough based on a control signal. A capacity switching device receives the two cap... | 01/10/1989 |
| 4794320 | Multi-frequency capacitance sensor The ratio C1 /C2 between the capacitances of two capacitors is obtained by connecting them into the frequency-determining circuit of an oscillator in at least three different combinations, namely C1 along, C2 al... | 12/27/1988 |
| 4772844 | High precision capacitance bridge A capacitance measuring device and method including a ratio transformer, a reference capacitor(s), and multiplying digital to analog converters connected to form a bridge, the converter being adjustable to at least partially balance the bridge. The bridge... | 09/20/1988 |
| 4766369 | Ice detector An ice detector 11 is provided for the determination of the thickness of ice 22 on the outer surface 12 on an object (e.g., aircraft 10) independently of temperature or the composition of the ice 22. First capacitive gauge 16, second capacitive gauge 18, ... | 08/23/1988 |
| 4716361 | Capacitance measuring method and apparatus An apparatus for performing ratiometric capacitance measurements by comparing the output of a digital-to-analog converter with the voltage at a tap between an unknown capacitance and a first inherent capacitance of the apparatus. A common input voltage is... | 12/29/1987 |
| 4555661 | Method and apparatus for determining dielectric constant An improved method and apparatus for determining the dielectric constant of materials which flow using capacitive techniques, having an electrode device with at least two output terminals and three or more electrodes spaced at fixed distances from one ano... | 11/26/1985 |
| 4490671 | Apparatus and method for determining the number of turns on a sample coil An apparatus and method for determining the number of turns on a sample coil are disclosed. An alternating current of substantially constant amplitude is passed through a primary winding turn which is coupled to the sample coil and also through a primary ... | 12/25/1984 |
| 4485284 | Apparatus and process for microwave moisture analysis An apparatus and process is disclosed for enabling the measurement of moisture in a sample cell by use of microwave energy. A sample cell of predetermined volume is located within an anechoic chamber and positioned on a weight measuring device to measure ... | 11/27/1984 |
