Piezoelectric physical quantity detector

Details Piezoelectric physical quantity detector Piezoelectric physical quantity detector

1989-05-05

1990-06-12

Noland, Tom

Measuring and testing

Speed, velocity, or acceleration

Acceleration determination utilizing inertial element

310329, G01P 1510

Patent

active

049322591

ABSTRACT:
A piezoelectric detector for detecting a physical quantity comprising, a piezoelectric device having a first electrode and a second electrode for modulating a carrier A.C., signal a excitation power source for supplying the carrier A.C. signal to the first electrode so as to excite the piezoelectric device, a weight mechanically coupled to the piezoelectric device so as to add the physical quantity to the piezoelectric device, an A.C. amplifier for amplifying a modulated output from the second electrode, and a demodulator for demodulating an amplified output from the A.C. amplifier. The piezoelectric detector measures the physical quantity while having a very low frequency range which D.C. includes.

REFERENCES:
patent: 3033043 (1962-05-01), Runft
patent: 3233466 (1966-02-01), Shaw
patent: 4409836 (1983-10-01), Comroe et al.
patent: 4694696 (1987-09-01), Hojo et al.
"Capacitive Transducers", by T. L. Foldvari et al., Instruments & Control Systems, pp. 77-85, Nov. 1964.

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