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Measuring the concentration of gaseous hydrogen fluoride

  • US 4,535,241 A
  • Filed: 11/17/1982
  • Issued: 08/13/1985
  • Est. Priority Date: 04/13/1981
  • Status: Expired due to Term
First Claim
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1. A method for quantitatively determining the concentration of gaseous hydrogen fluoride in a medium containing gaseous hydrogen fluoride, characterised in that said method comprises combining the results of (a) a measurement of the transmission or absorption of a laser beam at a first frequency corresponding to a neon 3 p4 -2 s2 transition through said medium containing gaseous hydrogen fluoride, and (b) a measurement of the transmission or absorption of a laser beam at a second frequency excluding said first frequency, through said medium containing gaseous hydrogen fluoride.

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