Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1978-08-23
1980-04-22
Smith, Alfred E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
G01J 100
Patent
active
041996836
ABSTRACT:
A nondispersive gas analysis device with minimal cross-sensitivity to interfering gases includes cuvettes for a sample gas and a reference gas which are irradiated by modulated infrared energy. Radiation which has passed through the cuvettes passes unidirectionally and successively through receiving chambers which are dimensioned to be geometrically and optically alike. The chambers are coupled through conduits to a pressure responsive differential signal generator unit. Loss of radiation intensity due to the window between two sets of receiving chambers is compensated for by using suitable optical coatings on the receiving chamber windows or by forming the walls of the upper set of chambers from a material having a thermal conductivity differing from that of the material used in the lower set. An absorption chamber positioned after the receiving chambers has an IR absorbing disc with a plurality of concentric grooves formed to define a sawtooth pattern. Embodiments for in-phase and out-of-phase use are disclosed.
REFERENCES:
patent: 3725702 (1973-04-01), Schaefer
patent: 3968369 (1976-07-01), Luft
Fields Carolyn E.
Smith Alfred E.
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