Capacitive pressure transducer

Details Capacitive pressure transducer Capacitive pressure transducer

1988-09-30

1989-09-19

Ruehl, Charles A.

Measuring and testing

Fluid pressure gauge

Vibration type

73723, G01L 900

Patent

active

048669881

ABSTRACT:
A pressure transducer capable of measuring very high pressures with great accuracy. The transducer includes a metal structure enclosing a volume which forms a resonant cavity to provide the tuning element in a UHF oscillator. The resonant cavity provides an inductance and a variable capacitance, the capacitance being variable as a function of the pressure to be measured. A transistor oscillator is very loosely coupled to the tuned circuit and provides positive feedback to maintain the oscillation. Due to the loose coupling between the transistor and the tune circuit, changes in the input reactance of the oscillator circuit have very little affect on the frequency of the tuned circuit. The frequency varies as a function of the pressure and provides an indication thereof. Two embodiments of the transducer are described. A first embodiment includes two concentric tubes, a section at the center of the outer tube being reduced in diameter to form an annular gap to provide the variable capacitance. A second embodiment includes a flat diaphragm-like member in close proximity to an opposing flat section. The capacitance between the diaphragm and the section is variable in response to an external pressure.

REFERENCES:
patent: 2668232 (1954-02-01), Tunick
patent: 3161060 (1964-12-01), Kemmer
patent: 3509499 (1970-04-01), Schaffner
patent: 4491806 (1985-01-01), Reynolds et al.

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