Differential surface acoustic wave transducer

Details Differential surface acoustic wave transducer Differential surface acoustic wave transducer

1977-03-18

1978-07-18

Myracle, Jerry W.

Measuring and testing

Vibration

Sensing apparatus

73609, 73658, 73DIG4, G01L 116

Patent

active

041008111

ABSTRACT:
A diaphragm formed in a substrate and having a piezoelectric surface includes a first surface acoustic wave (SAW) delay line disposed on said surface and connected in an oscillator circuit for a significant frequency sensitivity to surface strain of said diaphragm, and a second, similar oscillator with the SAW delay line thereof connected for a significant frequency sensitivity to surface strain of the diaphragm opposite in sense to that of the first oscillator, and a mixer for providing the difference in the frequencies of the two oscillators, whereby the overall sensitivity to strain is enhanced, while at the same time the sensitivity to temperature variations is reduced significantly through subtractive combination.

REFERENCES:
patent: 3858064 (1974-12-01), Schissler
patent: 3878477 (1975-04-01), Dias et al.
patent: 3940636 (1976-02-01), Perahia

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