Sensor conditioning circuitry for use with electrically excited

Details Sensor conditioning circuitry for use with electrically excited Sensor conditioning circuitry for use with electrically excited

1993-02-03

1997-02-25

Cosimano, Edward R.

Boots, shoes, and leggings

32420716, 364481, 364506, G01B 716, G01L 126

Patent

active

056065159

ABSTRACT:
Circuitry that is used to determine the strain of a component and includes a waveform random access memory that stores excitation digital data that represent values of an excitation waveform, a digital-to-analog converter to convert the digital data to an analog excitation signal, a strain sensing transducer that receives the excitation signal and generates an analog response signal, an analog-to-digital converter that digitizes the transducer response signal, a demodulator that multiplies the digital response signal times phase adjusted values of the excitation digital data stored in the waveform memory and low-pass filters the digital response signal, and a resistance-to-voltage converter connected to present a voltage indicating the resistance of an identifying resistor to the analog-to-digital converter. Also disclosed are the use of a serial data transmission line to transmit multiplexed excitation waveform data from a host to a plurality of slave sensor conditioning boards and a calibration technique for calculating a phase shift angle for the demodulator.

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Electronic Components and Circuits, Hardware Techniques and Processes, NASA Tech Briefs, Mar. 1992.
Chrysafis, A., "Digital Sine-Wave Synthesis Using the DSP56001", Motorola, Apr. 1, 1988.
Rader, C. M., "Method and Apparatus for Sampling In-Phase and Quadrature Components", The MIT Report, Oct. 1991.
Kehrer, R., "MGC Measuring Amplifier System--the optimum combination of analog and digital technologies drastically changes current amplifier structures", paper distributed publicly in 1990.
McCune, E., "Create signals having optimum resolution, response and noise", Digital RF Solutions Corp., EDN, pp. 95-107, Mar. 14, 1991.
Koljonen, T. et al., "Averaging increases .mu.P's ADC resolution", Design Ideas EDN, pp. 139-140, Feb. 1, 1990.

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