Sensing device for detecting the presence of a gas contained in

Details Sensing device for detecting the presence of a gas contained in Sensing device for detecting the presence of a gas contained in

1982-08-30

1985-01-29

Kreitman, Stephen A.

Measuring and testing

Gas analysis

Gas chromatography

G01N 2712

Patent

active

044957939

ABSTRACT:
A sensing device which senses the presence and/or concentration of one or more gases contained in a mixture is disclosed. An electrically charged semiconductor whose surface is in contact with the mixture of gases is illuminated with light, either intermittently or constantly. Changes in the transient and steady state conductivity of the semiconductor are measured and amplified. The form of the functionality between the gas and the conductivity changes is unique to a particular gas at a particular concentration and is used both to detect the presence and/or concentration of the gas.

REFERENCES:
patent: 3276004 (1966-09-01), Maye
patent: 4242303 (1980-12-01), Takahashi et al.
"Chemisorption, Photodesorption and Conductivity Measurements on ZuO Surfaces", Y. Shapira et al., Surface Science, 54, pp. 43-59, 1976.
"A Model for the Operation of a Thin-Film SnO.sub.x Conductance-Modulation Carbon Monoxide Sensor", Henry Windischmann and Peter Mark, J. Electro Chem. Soc., vol. 126, No. 4, pp. 627-633, Apr. 1979.

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