Measuring and testing – Fluid pressure gauge – Vibration type
Patent
1979-06-04
1981-05-05
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Vibration type
73300, 331 65, 310313R, G01L 900
Patent
active
042651247
ABSTRACT:
Disclosed is an acoustic wave sensor, including an acoustic wave oscillator having a resonant frequency which is modulated according to changes in a physical variable and a broadcast amplifier for directly transmitting the modulated frequency as a radio frequency signal. As a surface acoustic wave pressure sensor, the sensor includes a housing defining a cavity therein, an opening in the housing communicating with the cavity, a surface acoustic wave transducer attached to the housing to close the opening and adapted to deflect in response to a pressure differential across the transducer, an amplifier coupled to the transducer in a feedback loop, the transducer thereby being adapted to modulate the resonant frequency of the loop in response to the deflection, and a broadcast amplifier for directly transmitting the modulated frequency as a radio frequency signal. As a Stoneley acoustic wave pressure sensor, the sensor includes a housing defining a cavity therein, an opening in the housing communicating with the cavity, a Stoneley acoustic wave transducer attached to the housing to close the opening and adapted to deflect in response to a dynamic pressure differential across the transducer, an orifice in the housing communicating with the cavity to equalize any static pressure differential, an amplifier coupled to the transducer in a feedback loop, the transducer thereby being adapted to modulate the resonance frequency of the loop in response to the deflection, and a broadcast amplifier for directly transmitting the modulated frequency as a radio frequency signal.
REFERENCES:
patent: 3717857 (1973-02-01), Evans
patent: 3978731 (1976-09-01), Reeder et al.
Lim Teong C.
Staples Edward J.
Deinken John J.
Hamann H. Fredrick
Malin Craig O.
Rockwell International Corporation
Woodiel Donald O.
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