Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1989-02-10
1991-02-26
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250339, G01N 2161
Patent
active
049964313
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 two infrared radiation absorption channels with the wavelengths for measurement selected so that one channel at 3.2 microns provides an output signal corresponding to approximately the sum of all hydrocarbons in the gas sample which signal is displayed as an indication of concentration of hydrocarbon gas in the gas sample, and the other channel at 3.4 microns, after essentially being ratioed to the 3.2 micron channel output provides an output signal representative of the type or average type of hydrocarbon in the gas sample, and the ratio of the signal in the two channels is displayed as an indication of the type of hydrocarbon in the gas sample.
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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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