Differential surface acoustic wave transducer

Details Differential surface acoustic wave transducer Differential surface acoustic wave transducer

G - Physics

01

L

333/36, 331/55,

G01L 1/16 (2006.01) G01L 9/00 (2006.01) H03B 5/32 (2006.01)

Patent

CA 1082797

ABSTRACT OF THE DISCLOSURE A diaphragm formed in a substrate and having a piezo- electric 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. The invention disclosed herein was made in the course of or under a contract with the Department of the Navy.

297532

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