Pressure sensor

Details Pressure sensor Pressure sensor

1988-05-20

1990-08-07

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Vibration type

73708, 73717, G01L 708, G01L 1100, G01L 1904

Patent

active

049457683

ABSTRACT:
A pressure sensor for accurate readings of low pressures utilizes an ultrasonic transmitter which sends a signal to a movable diaphragm via a waveguide. Pressure changes across the diaphragm causes changes in the signal path length from transmitter to receiver which are translated into pressure readings via electronic circuitry employing phase comparator circuitry. The received signal is split into two signals one of which is shifted in phase. A temperature responsive controller selects which received signal is used in a comparison with the transmitted signal thus greatly extending the temperature range over which the sensor operates. The use of an ultrasonic waveguide with a length of at least twice the frequency of the transmitted signal coupled to the transmitter eliminates echoes and reflections and provides for enhanced accuracy in reading even very low pressures.

REFERENCES:
patent: 2985018 (1961-05-01), Williams
patent: 3500301 (1970-03-01), Meier
patent: 4244226 (1981-01-01), Green et al.
patent: 4264788 (1981-04-01), Keidel et al.
patent: 4456849 (1984-06-01), Takayama et al.

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