Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1974-09-27
1977-03-22
Smith, Alfred E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
356 51, G01J 100, G01N 2124, G01N 2126
Patent
active
040132609
ABSTRACT:
An improved gas analyzer for measuring the presence of one or more gaseous compounds in a gas sample. The gas analyzer has an infrared source stabilized against temperature variations by a radiation loading scheme in combination with a selected source environmental temperature sensitivity to provide a stable source temperature without a conventional temperature controller. A rotating interference filter assembly is disposed in the optical path. This assembly alternately totally blocks radiation, passes radiation in a wave length band which will not be absorbed by a random gas sample, and sequentially passes radiation in one or more additional bands which will be absorbed by one or more gases in the sample cell. The sample cell features a unique enclosed cell with infrared transparent windows which are substantially free of impingement of contaminants of the gas sample thereon. A unique detector provides protection against deterioration from moisture while allowing easy and inexpensive assembly. The system electronics eliminates sensitivities to background radiation, contamination of windows, etc., and provides a self test capability.
REFERENCES:
patent: 3790797 (1974-02-01), Sternberg et al.
Burough Irvin G.
McClatchie Edward A.
Watson Dean A.
Andros Incorporated
Grigsby T. N.
Smith Alfred E.
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