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Optical gas analyzer

  • US 5,130,544 A
  • Filed: 09/09/1988
  • Issued: 07/14/1992
  • Est. Priority Date: 09/15/1987
  • Status: Expired due to Fees
First Claim
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1. An optical gas analyzer for analyzing an anesthetic gas, N2 O and CO2, each of said anesthetic gas, N2 O and CO2 having corresponding wavelength characteristics, contained in a gas sample comprising a source of radiation, means for defining a radiation path, gas sample means for providing said gas sample in said radiation path whereby said radiation passes through said gas sample, radiation divider means for dividing said radiation after passing through said gas sample into at least three secondary radiation paths, at least three optical filter means, said at least three optical filter means including first optical filter means corresponding to said anesthetic gas characterized by passing therethrough a wavelength of about 8.81μ

  • , second optical filter means corresponding to said N2 O characterized by passing therethrough a wavelength which is characteristic for said N2 O, and third optical filter means corresponding to said CO2 characterized by passing therethrough only wavelengths of about 4.26μ

    , and at least three detector means for measuring said wavelength characteristics of said gases to be analyzed, said radiation divider means comprising mirror means wherein said at least three optical filter means and said mirror means are arranged such that said radiation may be passed through said at least three optical filter means to said at least three detector means after a single reflection from said mirror means.

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