Gas detector

Details Gas detector Gas detector

1979-02-09

1981-04-28

Evans, F. L.

Optics: measuring and testing

By shade or color

Fluid color transmission examination

250343, 350315, 356 51, 356416, 356437, G01N 2125

Patent

active

042642094

ABSTRACT:
Apparatus for illuminating a gas or gas mixture and filtering the output thereof alternately with two filters. One filter has a passband at an absorption band of a gas to be detected. The other filter has a passband outside the absorption band.

REFERENCES:
patent: 3319071 (1967-05-01), Werth et al.
patent: 3694086 (1972-09-01), May
patent: 3756726 (1973-09-01), Astheimer
patent: 3853407 (1974-12-01), Dewey, Jr.

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