Gas analyzer sample cell

Details Gas analyzer sample cell Gas analyzer sample cell

1978-04-13

1979-12-04

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250576, 356246, 356410, 356440, G01J 100, G01N 110, G01N 2124, G01N 2126

Patent

active

041773810

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: 2534657 (1950-12-01), Bray
patent: 3207026 (1965-09-01), Churchill et al.

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