Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1989-02-10
1990-09-18
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250339, G01N 2161
Patent
active
049580760
ABSTRACT:
A selective gas detecting apparatus for determining the concentration and type of hydrocarbon gas in a gas sample based upon absorption of infrared radiation by the gas sample, the apparatus having at least two infrared radiation absorption channels with the wavelengths for measurement in the two channels selected as 3.2 microns and 3.4 microns, signals in the two channels being processed to formulate an indication of absorbance of hydrocarbons at the selected wavelength, the absorbance signal in one channel being displayed as an indication of concentration of approximately the total hydrocarbon gas in air and the ratio of absorbances being displayed as an indication of the type of hydrocarbon in air and independent of the concentration of the gas.
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Bonne Ulrich
Matthys Robert J.
Fields Carolyn E.
Gas Research Institute
Pauley Douglas H.
Speckman Thomas W.
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