Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1990-10-30
1991-10-08
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250343, G01N 2161
Patent
active
050556886
ABSTRACT:
Nondispersive infrared gas analyzer for the concurrent measurement in the concentration of several components contained in a gas sample, and including a source of and modulator for infrared radiation, a measuring and reference chamber are traversed by said beams, at least two serially pneumatic radiation detectors each having a front and a rear chamber filled with a respective component and each provided for measuring the pressure differential between the respective chambers, a filter disposed between the first detectors upstream and having opaque range which covers at least a major absorption band of the component filling the downstream detector but having a region of transparency which includes at least one secondary absorption band of that component.
REFERENCES:
patent: 2898800 (1959-08-01), Bergson
patent: 3770974 (1973-11-01), Fertig
patent: 3898462 (1975-08-01), Ishida et al.
patent: 4336453 (1982-06-01), Imaki et al.
patent: 4692622 (1987-09-01), Taniguchi et al.
Glick Edward J.
Hannaher Constantine
Hartmann und Braun A.G.
Siegemund Ralf H.
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