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Method of compensating for carrier-gas-composition dependence due to the collision-broadening effect in non-dispersive infrared photometers having a detector comprised of two absorption chambers arranged one behind the other

  • US 4,110,619 A
  • Filed: 01/28/1977
  • Issued: 08/29/1978
  • Est. Priority Date: 11/21/1975
  • Status: Expired due to Term
First Claim
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1. A method of setting up a non-dispersive infrared photometer of the type comprised of a light source, a reference cuvette containing a reference gas, a measurement cuvette containing an infrared-active gas component whose concentration is to be measured accompanied by a carrier gas, the carrier gas comprising at least one component which is infrared-inactive, a light modulator for effecting antiphase modulation of the light passing through the two cuvettes, and a detector arrangement comprised of two gas-filled absorption chambers arranged one behind the other and a transducer for converting pressure changes induced in the absorption chambers into a measurement signal, the method comprising the step of adjusting the photometer to render the measurement signal substantially independent of the composition of the carrier gas in the measurement cuvette.

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