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Gas analyzer cuvettes

  • US 5,616,923 A
  • Filed: 09/02/1994
  • Issued: 04/01/1997
  • Est. Priority Date: 05/23/1990
  • Status: Expired due to Term
First Claim
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1. A gas analyzer for outputting a signal indicative of the concentration of a designated gas in a gas sample which may contain that gas, said gas analyzer comprising:

  • a casing which houses an infrared radiation emitter, an infrared radiation detector, and a cuvette for so confining said sample that infrared radiation propagated along an optical path between the infrared radiation emitter and the infrared radiation detector traverses the gas(es) in said sample;

    said cuvette comprising wall means and windows fixed in apertures in said wall means at opposite sides thereof, said wall means and said windows defining a sampling passage through which said gas sample can flow along a straight path extending generally normal to said optical path;

    said gas analyzer casing having first and second compartments located on opposite sides of the cuvette;

    said windows cooperating with the gas analyzer casing wall means to isolate the first and second compartments in the gas analyzer casing from the sampling passage;

    the infrared radiation emitter and the infrared radiation detector being isolated in the first compartment with the emitter being so oriented as to direct radiation through the cuvette to the second compartment;

    the gas analyzer further comprising mirror means isolated in said second compartment for redirecting the infrared radiation reaching that compartment back through the cuvette to the infrared radiation detector; and

    the cuvette wall means having sufficient porosity that gas can reach and/or exit from the sampling passage by diffusion or convective flow.

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