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Method and apparatus for detecting the presence of carbon dioxide in a sample

  • US 5,272,088 A
  • Filed: 04/26/1993
  • Issued: 12/21/1993
  • Est. Priority Date: 09/12/1991
  • Status: Expired due to Fees
First Claim
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1. Method for detecting the presence or determining the concentration of carbon dioxide gas in a sample comprising the steps of a) exposing to a predetermined wavelength range radiation a carbon dioxide-quenchable photoluminescent phosphor put in contact with said sample to cause said phosphor to store radiation, b) stimulating said photoluminescent phosphor with infrared radiation to release the stored energy as photoluminescent light, c) detecting and measuring by detecting means the intensity of said photoluminescent light and d) correlating said measured intensity with an intensity of the photoluminescent light previously measured at a given reference carbon dioxide pressure value, wherein said photoluminescent phosphor is an europium activated magnesium oxide phosphor having anionic vacancies.

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