Automatic nulling circuit for transient pressure rate changes

Details Automatic nulling circuit for transient pressure rate changes Automatic nulling circuit for transient pressure rate changes

1980-08-15

1983-01-25

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Electrical

374 65R, G01L 2112

Patent

active

043696619

ABSTRACT:
An automatic nulling circuit applicable to small leak detection in vacuum chambers. A pressure sensitive, variable impedance element is connected as one branch of a bridge circuit, another branch of which comprises an adjustable impedance circuit. The voltage across the two branches are normally balanced by means of an amplifier circuit which amplifies any differential between the branch voltages, and a feedback circuit between the amplifier output and the adjustable impedance element. The amplifier and feedback circuits, however, introduce a time lag such that the two branches are unbalanced, resulting in an amplified output, in response to a changing sensed pressure. A filter circuit removes the effects of long term pressure changes, whereby the nulling circuit produces an output only for short term transients in the rate of pressure change, such as those associted with small leak testing.

REFERENCES:
patent: 2511855 (1950-06-01), Keck et al.
patent: 3079800 (1963-03-01), Hoar
patent: 3778710 (1973-12-01), Snook
patent: 4242665 (1980-12-01), Mate

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