Relative phase sensor employing surface acoustic waves

Details Relative phase sensor employing surface acoustic waves Relative phase sensor employing surface acoustic waves

1980-07-18

1982-03-23

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Delay lines including elastic surface wave propagation means

324 83R, 333154, H03H 968, H03H 972

Patent

active

043215653

ABSTRACT:
A sensor formed on the surface of a body of piezoelectric material. Two input transducers disposed on the surface in parallel spaced apart relation produce surface acoustic waves in the body in response to the application of signals to the input transducers. A row of output transducers is disposed on the surface between the input transducers. Individual output transducers are offset from one another by amounts related to the wavelength of the surface acoustic wave so that at or near only one of the output transducers will the two surface acoustic waves from the input transducers cancel each other. An analog circuit and a digital circuit for ascertaining which output transducer experiences maximum cancellation to afford a determination of the delay difference between the two signals applied to the input transducers.

REFERENCES:
patent: 3723916 (1973-03-01), Speiser et al.
patent: 3803395 (1974-04-01), Quate
patent: 4070638 (1978-01-01), Reeder

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