Absolute pressure sensor

Details Absolute pressure sensor Absolute pressure sensor

1981-04-27

1983-08-02

Tung, T.

Chemistry: electrical and wave energy

Processes and products

204406, G01N 2746

Patent

active

043964664

ABSTRACT:
This specification discloses an absolute pressure sensor and measuring technique using an electrochemical apparatus as a feedback element in an oscillator circuit. The sensor needs no reference pressure or reference vacuum. Contributing to sustained oscillation is a phase shift caused by the electrochemical apparatus. The period of oscillation of the oscillator circuit is inversely proportional to the diffusion coefficient of oxygen in its carrier gas, which, in turn, is inversely proportional to total absolute pressure. The result is that the period of oscillation of the oscillator circuit is proportional to total absolute pressure.

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