Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1983-03-08
1985-02-12
Howell, Janice A.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250352, G01J 100
Patent
active
044993790
ABSTRACT:
An infrared radiation gas analyzer for determining the concentration of an ingredient in a sample gas has a sample gas container for containing a sample gas at a temperature at which the ingredient the concentration of which is to be determined will emit infrared radiation in the range characteristic of the ingredient and a window for allowing the infrared radiation to escape from the container. An optical chopper outside said container interrupts the radiation escaping from the container. A pair of filters is positioned in the path of the radiation escaping from the container and spaced transversely of the path, one of the filters transmitting only radiation in the range and the other of the filters transmitting only radiation in a range near to the first mentioned range. Infrared radiation detectors are positioned for receiving the radiation passed by the respective filters and they emit a signal representative of the difference between the radiation received by the respective detectors and which is representative of the concentration of the ingredient the concentration of which is to be determined in the sample gas.
REFERENCES:
patent: 3794838 (1974-02-01), Weiss et al.
patent: 3968370 (1976-07-01), Luft
patent: 4233513 (1980-11-01), Elder et al.
patent: 4320297 (1982-03-01), Cederstrand et al.
patent: 4373137 (1983-02-01), Fabinski et al.
Miyatake Kimio
Tomita Katsuhiko
Horiba Ltd.
Howell Janice A.
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