Surface acoustic wave pressure gauge

Details Surface acoustic wave pressure gauge Surface acoustic wave pressure gauge

1980-03-06

1982-03-02

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Vibration type

73DIG4, G01L 1100

Patent

active

043173721

ABSTRACT:
The present invention relates to a pressure gauge of the type comprising a piezoelectric substrate one face of which is polished and carried two delay lines using interdigital combs forming part of two oscillators whose output signals are mixed. The gauge comprises a two-part case communicating with a pressure gauge inlet, a piezoelectric wafer fixed by its edges to a support, the whole forming a sealed dividing wall with respect to the fluid contained in the inlet, this latter exerting its pressure on the non-polished face of the wafer. A printed circuit carrying the required electronic circuits is connected to the delay lines and inserted between the two parts of the case. A protection device may be provided for avoiding contact between the polished face and polluted air, while maintaining constant pressure on this face.

REFERENCES:
patent: 3858064 (1974-12-01), Schissler
patent: 3878477 (1975-04-01), Fleming et al.
patent: 3888115 (1975-06-01), Schwartz
patent: 3978731 (1976-09-01), Reeder et al.
patent: 4096740 (1978-06-01), Sallee
patent: 4100811 (1978-07-01), Cullen et al.
patent: 4107626 (1978-08-01), Kiewit
patent: 4227182 (1980-10-01), Ogasawara et al.

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