Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1977-05-03
1978-07-25
Willis, Davis L.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
G01N 2126
Patent
active
041031636
ABSTRACT:
An infrared gas analyzer includes side-by-side measuring and comparison vessles S, V containing sample and reference gases alternately exposed to infrared light through a rotary chopper CH. The end windows of the vessels are transparent, and a detector D containing two series chambers D1, D2 filled with a gas of the same kind as the component gas to be analyzed is axially disposed below the vessels. A capacitive diaphragm sensor is coupled between the chambers to detect pressure variation differences therebetween, and an adjustable reflecting means is disposed below the transparent bottom window of the second chamber to reflect back a portion of the light energy passing therethrough. The degree of reflection is suitably adjusted so that any interference gas component has an equal influence on the absorption curves of both chambers, whereby its effects are self-cancelling.
The same structural concept of an adjustable reflecting means disposed below the bottom window of the second chamber may also be used to implement zero adjustment when a reference gas is circulated through the vessel.
REFERENCES:
patent: 3950644 (1976-04-01), Blunck
patent: 3968369 (1976-07-01), Luft
Fuji Electric & Co., Ltd.
Willis Davis L.
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