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Gas constituent measurement and recording

  • US 4,927,766 A
  • Filed: 05/27/1986
  • Issued: 05/22/1990
  • Est. Priority Date: 05/27/1986
  • Status: Expired due to Fees
First Claim
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1. A method of measuring the molecular concentration of a constituent in a gas comprising the steps of:

  • (a) contacting the gas with a surface of a solid body;

    (b) momentarily heating said surface so that said constituent reacts at said surface to alter a property of said surface permanently; and

    (c) determining the degree or rate of alteration in said property produced by reaction of said constituent during said momentary heating step, said heating step including the step of momentarily applying heating radiant energy to said surface in a plurality of heating pulses to a plurality of different localized regions of said surface in temporal sequence, said determining step being performed separately for each of said localized regions to thereby provide a plurality of measurements of said molecular concentration, whereby each of said measurements is indicative of said molecular concentration at the time of one of said pulses.

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