AC excited transducer having stabilized phase sensitive demodula

Details AC excited transducer having stabilized phase sensitive demodula AC excited transducer having stabilized phase sensitive demodula

1983-04-11

1986-07-08

Karlsen, Ernest F.

Electricity: measuring and testing

Magnetic

Displacement

34087036, 318657, 364560, G01B 714, G05B 106, G08C 1906

Patent

active

045995605

ABSTRACT:
A signal conditioning circuit (30) using an oscillator (32) which feeds a counter (34) whose output addresses a programmable memory (42). The output of the programmable memory (42) provides a selected processed signal which is used for excitation of a transducer (12). The processed signals can have various phase shifts, frequencies, or amplitudes. The transducer (12) has a mechanical input (14) and provides a modulated signal output which is a function of the mechanical input. The output of the transducer (12) is fed to a phase sensitive demodulator (36). Demodulator (36) provides an output signal in response to the signal from transducer (12) and an appropriate demodulator drive signal. The output signal from demodulator (36) is indicative of the mechanical input to transducer (12). Averaging means (40) is connected to the output of the demodulator (36) to provide a DC signal which is proportional to the mechanical input to transducer (12).

REFERENCES:
patent: 4134065 (1979-01-01), Bauer et al.
patent: 4140998 (1979-02-01), Bettle
patent: 4207520 (1980-06-01), Flora et al.
patent: 4322683 (1982-03-01), Vieira et al.
patent: 4450443 (1984-05-01), Dolland
"Transducer Signal Conditioners" December, 1971, Technical Bulletin 7001 pp. 1-4 by Schaevitz Engineering.
"Signal Conditioning Stops Transducer Errors" Feb. 18, 1981 EDN pp. 147, 150 by Yishay Netzer-Honeywell Electro Optics.
"Multifunction chip plays many parts in analog design" 4/7/81 Electronics pp. 121-129 by David Gilooly & Paul Henneuse.

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