Electric circuits

Details Electric circuits Electric circuits

1977-03-28

1978-03-28

Goldstein, Herbert

Measuring and testing

Gas analysis

By vibration

73204, G01F 168

Patent

active

040808211

ABSTRACT:
An electric circuit includes three matched resistance thermometer sensors and is responsive to changes in rate of heat loss from at least one of them. The sensors are connected in a series-parallel arrangement to form one arm of a bridge circuit. An amplifier detects imbalance in the bridge and controls current flowing in the bridge to restore balance. Twice as much current flows in one sensor than in the other two, so that the one is maintained hotter. Environmental changes effecting a change in the rate of heat loss from the one sensor are detected as a change in current flowing in the bridge.

REFERENCES:
patent: 2552017 (1951-05-01), Schwartz et al.
patent: 2726546 (1955-12-01), King, Jr.
patent: 3995481 (1976-12-01), Djorup

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