Gas sensitive devices

Details Gas sensitive devices Gas sensitive devices

1974-03-29

1976-01-13

Smith, Alfred E.

Electricity: measuring and testing

Determining nonelectric properties by measuring electric...

Erosion

340237S, 23254, 73 23, G01N 2700, G08B 2100, G01N 3100

Patent

active

039328074

ABSTRACT:
In a system for detecting a gas or vapour by virtue of its effect on the electrical conductivity of a semiconducting material which is maintained at a suitable operating temperature by an electric resistance heater, the heater has an appreciable temperature coefficient of resistance and is connected in a bridge circuit, the current supplied to the bridge being automatically controlled in response to variations of its out-of-balance voltage so as to maintain constancy of the resistance of the heater and hence of the operating temperature.

REFERENCES:
patent: 3695848 (1972-10-01), Taguchi
patent: 3699803 (1972-10-01), Sumi et al.

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