Pneumatic detector for nondispersive infrared gas analyzers

Details Pneumatic detector for nondispersive infrared gas analyzers Pneumatic detector for nondispersive infrared gas analyzers

1986-06-23

1988-05-03

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250344, G01N 2161

Patent

active

047422297

ABSTRACT:
A pneumatic detector for nondispersive infrared gas analyzers comprises two gas-filled chambers disposable one behind the colinearly with a source of infrared radiation and connected to one another by a gas conductive line containing a microflow sensor which generates an electrical signal indicative of the pressure difference between the two chambers. A third chamber is disposed on a side of the two chambers opposite the radiation source and is connected to a second of the two chambers via a gas conductive line. An adjustable aperture stop is arranged between the second and the third gas-filled chambers. The arrangement of chambers and the adjustable aperture stop serve to compensate and reduce to zero a negative cross-sensitivity.

REFERENCES:
patent: 2951939 (1960-09-01), Luft
patent: 3968369 (1976-07-01), Luft
patent: 3970387 (1976-07-01), Faulhaber et al.
patent: 4210808 (1980-07-01), Miyatake
patent: 4336453 (1982-06-01), Imaki et al.
M. S. Turnbull, "Non-Dispersive Infra-Red Gas Analyzers" Electronics and Instrumentation vol. 2, No. 12 (Mar. 1972) pp. 11-15.

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