Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Specified electrical sensor or system
Patent
1990-11-29
1992-02-18
Raevis, Robert
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Specified electrical sensor or system
G10L 120
Patent
active
050883305
ABSTRACT:
A device for measuring a physical quantity includes a transducer and circuitry for exciting the transducer with an a.c. square wave. The excitation circuitry includes two amplifiers, a switch and a resistor network. The excitation circuitry provides a plus one gain when the switch is in one position and a minus one gain when the switch is in a second position. A similar circuit synchronously demodulates the transducer's output signal. Another similar circuit synchronously demodulates the transducer excitation signal and provides a reference voltage to an analog-to-digital converter (ADC). The ADC converts the demodulated transducer ouptut signal into a binary word. Both demodulated signals are filtered before application to the ADC. An example of the device is a force-measuring device such as a weighing scale incorporating a strain gauge load cell.
REFERENCES:
patent: 2924967 (1960-02-01), Gieseler
patent: 3354703 (1967-11-01), Russell, Jr. et al.
patent: 3965429 (1976-06-01), Roberts, III
patent: 4155263 (1979-05-01), Frantz
Analog Devices; Linear Products Data Book; 1988; pp. 9-15, 9-16.
Horowitz, Paul et al.; The Art of Electronics, 2d ed.; 1989; p. 183.
Levin Nathaniel
Pitney Bowes Inc.
Raevis Robert
Scolnick Melvin J.
Whisker Robert H.
LandOfFree
Square wave excitation of a transducer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Square wave excitation of a transducer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Square wave excitation of a transducer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1815420