Method and apparatus for detecting gas

Details Method and apparatus for detecting gas Method and apparatus for detecting gas

1986-03-18

1987-11-24

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250343, 356437, G01N 2135

Patent

active

047091509

ABSTRACT:
An analyzer to detect a specific gas in the atmosphere by infrared absorption, having a porous tube surrounding an enclosed column of air, the porous tube having an average pore size to permit gas to diffuse through it quickly, and having within the tube an infrared source, an infrared detector and an optical filter that passes those portions of the infrared spectrum most strongly absorbed by the gas, the analyzer having a time base generator to pulse the infrared source and electronic means to measure the maximum and minimum signals from the detector and a meter to indicate the difference between the maximum and minimum as a measure of the amount of the gas in the column of air.

REFERENCES:
patent: 3529152 (1970-09-01), Strange et al.
patent: 3790797 (1974-02-01), Sternberg et al.
patent: 3826918 (1974-07-01), Van Der Koogh et al.
patent: 3860818 (1975-01-01), Stalder et al.
patent: 4323777 (1982-04-01), Baskins
patent: 4437005 (1984-03-01), Ophoff et al.

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