Infrared source for use in an infrared gas detector

Details Infrared source for use in an infrared gas detector Infrared source for use in an infrared gas detector

1976-12-13

1978-07-25

Smith, Alfred E.

Radiant energy

Radiant energy generation and sources

219553, 250504, G21G 400, G21K 100, H05B 310

Patent

active

041031741

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 stablized 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: 2596837 (1952-05-01), Calvert
patent: 3205343 (1965-09-01), De Bell et al.
patent: 3394259 (1968-07-01), Brown
American Institute of Physics Handbook, Second Edition, pp. 6-160, McGraw-Hill, 1963.

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