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MULTICHANNEL EXHAUST GAS ANALYZER

  • US 3,743,426 A
  • Filed: 11/26/1971
  • Issued: 07/03/1973
  • Est. Priority Date: 11/26/1971
  • Status: Expired due to Term
First Claim
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1. A multichannel exhaust gas analyzer for monitoring the time variant concentrations of a multicomponent mixture of gases by measuring the absorption by the mixture at selected optical wavelengths comprising, a radiation source, a detector, means establishing a radiation path between said source and said detector, a plurality of absorption cells of different lengths located in said radiation path, means for communicating said mixture serially through said plurality of absorption cells, a reference cell containing a reference gas located adjacent the first of said absorption cells, a span cell containing a calibration gas located adjacent the last of said absorption cells, a rotatable chopper wheel interposed between said source and said detector and containing a plurality of spectral filters arranged to be sequentially positioned in said radiation path during rotation of said chopper wheel, each of said filters sequentially passing radiation of a particular optical wavelength through each of said cells, and means for rotating said chopper wheel.

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