Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1979-05-24
1981-02-17
Willis, Davis L.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
356437, 356440, G01N 2126
Patent
active
042517273
ABSTRACT:
The invention provides an apparatus for detecting gases by absorption of infra-red radiation comprising a source of infra-red radiation arranged at one end of an optical path through the apparatus, at the other end of which path there is an infra-red detector. A plurality of cells located within an enclosure housing the cells are arranged to be moved in turn into the optical path in such position that when a cell is positioned on the optical path, the infra-red radiation passes through the cell before reaching the detector. The atmosphere to be tested is introduced into the enclosure and some of the cells are provided with means by which during movement of those cells through the enclosure into the optical path the atmosphere in the enclosure is pumped into the cell. Electronic means are provided for comparing the infra-red radiation received by the detector when one cell is positioned on the optical path with the infra-red radiation received by the detector when a different cell is positioned on the optical path and for producing a signal dependent on the comparison. The invention also provides a process for detecting gases using the apparatus of the invention.
REFERENCES:
patent: 3869613 (1975-03-01), Link et al.
patent: 3904880 (1975-09-01), Benz et al.
patent: 3950101 (1976-04-01), Dewey, Jr.
patent: 4055395 (1977-10-01), Honkawa et al.
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