Displacement converter

Details Displacement converter Displacement converter

1980-09-03

1982-11-09

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

With pressure and/or temperature compensation

73706, 73718, 73724, 331 65, 361283, G01L 1904

Patent

active

043578349

ABSTRACT:
A displacement converter useful for pressure gauges and similar instruments, the converter including a displacement detector provided with a variable capacitor responsive to the displacement to be metered and a fixed capacitor insensitive thereto. Also included is an amplitude-controllable oscillator whose AC output is applied to both capacitors, means being coupled to the capacitors to derive therefrom electrical signals which are a function of their capacitance values. These electrical signals are fed to a control circuit to produce a control signal corresponding to the difference therebetween, the control signal being applied to the oscillator to govern the output amplitude thereof in a manner maintaining the control signal at a constant value.

REFERENCES:
patent: 3858097 (1974-12-01), Polye
patent: 3952234 (1976-04-01), Birchall
patent: 4227419 (1980-10-01), Park
patent: 4272822 (1981-06-01), Yasuhara
patent: 4289035 (1981-09-01), Lee

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