Filters for gas detectors

Details Filters for gas detectors Filters for gas detectors

1975-09-02

1977-05-24

Church, Craig E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

356106S, G01N 2126

Patent

active

040257924

ABSTRACT:
A radiation filter, for a gas detector, comprising an optical interferome having in each of first and second physically separated optical paths therethrough a gas cell containing a quantity of the gas to be detected; there being a difference in pressure between the quantities of gas in the two gas cells; the gas cells being of substantially equal lengths in the direction of the optical path therethrough; and the interferometer being arranged so that in the absence of the gas cells there is zero path difference between the said first and second optical paths through the interferometer.

REFERENCES:
patent: 3381134 (1968-04-01), Wolf
patent: 3723731 (1973-03-01), Blau

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