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High performance side stream infrared gas analyzer

  • US 5,932,877 A
  • Filed: 04/17/1997
  • Issued: 08/03/1999
  • Est. Priority Date: 04/17/1997
  • Status: Expired due to Fees
First Claim
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1. An infrared gas analyzer for detecting the concentration of a gaseous component of a substantially gaseous flow stream provided via an airway, comprising:

  • an infrared energy detector which converts received incident radiation into at least one electrical signal representative of the received incident radiation, said infrared energy detector having a first infrared transmissive window on a detection side thereof through which said incident radiation passes for detection;

    a sample cell mounted on said detection side of said infrared energy detector such that said first infrared transmissive window of said infrared energy detector is shared with said sample cell on one side thereof, said sample cell receiving at least a portion of said substantially gaseous flow stream and directing said portion to a detection volume having a smooth surface and a low swept volume which promote laminar flow of said gaseous flow stream through said sample cell; and

    a source of infrared energy mounted on a side of said sample cell opposite said infrared energy detector so as to emit infrared energy through a second infrared transmissive window which is shared by said source and a side of said detection volume opposite said one side, through said detection volume for absorption by said gaseous component, and through said first infrared transmissive window for detection by said infrared energy detector,whereby said infrared energy from said source passes through a single infrared transmissive window to enter said sample cell on said other side of said sample cell and exits said sample cell through a single infrared transmissive window on said one side of said sample cell for detection.

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