Identification of unknown gases using infrared absorption spectr

Details Identification of unknown gases using infrared absorption spectr Identification of unknown gases using infrared absorption spectr

1995-05-11

1996-04-16

Porta, David P.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

25033904, 25033913, G01J 302

Patent

active

055085253

ABSTRACT:
A method and apparatus for identifying an unknown gas by generating an infrared spectrum of the unknown gas using an infrared spectrophotometer that includes a circular variable interference filter, compressing the infrared spectrum of the unknown gas, and comparing the compressed infrared spectrum of the unknown gas to a library of compressed infrared spectra of reference compounds. After comparison, the compressed spectra that most closely match the unknown gas are decompressed and displayed. Because frequency characteristics of circular variable interference filters vary from filter to filter, information designating these frequency characteristics for the particular filter employed are used in generating the infrared spectrum of the unknown gas.

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G. Hangac et al., "Compression of an Infrared Spectral Library by Karhunen-Loeve Transformation," Applied Spectroscopy, vol. 26, No. 1, 1982.

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