Measuring and testing – Fluid pressure gauge – Diaphragm
Patent
1981-06-01
1983-07-05
Birmiel, Howard A.
Measuring and testing
Fluid pressure gauge
Diaphragm
324 57Q, 324 60C, 331 65, 331142, G01L 912
Patent
active
043911463
ABSTRACT:
A circuit for measuring a parameter to be sensed by means of at least one variable impedance sensor responsive to such parameter. The circuit includes a frequency determining means coupled to the variable sensor for providing an oscillatory frequency signal responsive to the impedance of the sensor, a signal amplifier coupled to the frequency determining means for amplifying the frequency signal to provide an output signal representative of the frequency signal and to sustain circuit oscillation, a signal detector coupled to the output signal to provide a control signal representative of such output signal, and a control coupled to receive the control signal and coupled to the frequency determining means thus allowing the oscillatory frequency signal of the circuit to oscillate at a frequency representative of the measured parameter.
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Birmiel Howard A.
Rosemount Inc.
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