Gas detection by infrared absorption

Details Gas detection by infrared absorption Gas detection by infrared absorption

1991-05-03

1991-12-03

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250351, 356 51, 356437, G01N 2161

Patent

active

050702440

ABSTRACT:
A method of detecting for the presence of a combustible infrared absorbing gas in air, particularly in hazardous locations such as on gas and oil rigs. A source of switched infrared radiation is beamed onto a detector within a chamber and an output signal is derived as a measure of radiation incident on the detector. A reduction in the level of the output signal indicates absorption of radiation within the chamber and, thus, indication of the presence of infrared absorbing gas within the chamber. The output signal is processed in a manner which makes provision for the existence of changing levels of background radiation which would otherwise result in a false indication of the presence or absence of combustible gas.

REFERENCES:
patent: 4549080 (1985-10-01), Baskins et al.
patent: 4641973 (1987-02-01), Nestler et al.
patent: 4772790 (1988-09-01), Aldridge

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