Vacuum gauge

Details Vacuum gauge Vacuum gauge

1990-12-27

1992-01-14

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Electrical

73708, 330789, 338 36, G01L 2112

Patent

active

050799541

ABSTRACT:
The present invention provides a vacuum gauge having two integrated circuits connected in a half bridge circuit to register subatmospheric gas pressure from a change in thermal gas conductivity. One of the integrated circuits serves to generate an electrical current proportional to the ambient temperature and a function of its power output conducted by the gas. The other of the integrated circuits acts as a reference to generate an electrical current proportional to ambient temperature. The half bridge circuit acts to subtract the currents so that subatmospheric pressure can be read on an ammeter as a function of gas thermal conductivity.

REFERENCES:
patent: 2736200 (1956-02-01), Kleimack et al.
patent: 3066537 (1962-12-01), Rivera
patent: 3139754 (1964-07-01), Dore
patent: 3884080 (1975-05-01), Chapman
patent: 4123698 (1978-10-01), Timko et al.
patent: 4134304 (1979-01-01), Yamamoto
patent: 4369661 (1983-01-01), Gibb
patent: 4492123 (1985-01-01), Reich
patent: 4541286 (1985-09-01), Holme
patent: 4682503 (1987-07-01), Higashi
patent: 4995264 (1991-02-01), Stocker et al.
"Temperature Measurement Components", vol. 1, pp. 8-15 to 8-21.
"IEEE Journal of Solid-State Circuits", Dec. 1976, pp. 784-788.

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