ApplicationNo. 05/895937 filed on 04/13/1978
US Classes:250/343, With means to transmission-test contained fluent material250/576, Sample holder or supply356/246, Fluid containers (e.g., cells or cuvettes)356/410, Of flowing liquids356/440With significant sample holder or supply
ExaminersPrimary: Smith, Alfred E.
Assistant: Grigsby, T. N.
Attorney, Agent or Firm
International ClassesG01N 33/00 (20060101)
G01N 21/03 (20060101)
G01N 21/31 (20060101)
AbstractAn 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.