Nondispersive infrared gas analyzer

Details Nondispersive infrared gas analyzer Nondispersive infrared gas analyzer

1980-03-12

1981-12-15

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250345, G01N 2126

Patent

active

043061532

ABSTRACT:
A two-beam, infrared gas analyzer includes a front and a rear detection cell in each path filled with gas of the type to be detected; and a pressure-differential chamber with capacitor pick-up is connected to these front and rear cells. The rear cells are constructed to ensure substantially complete absorption of all radiation of the absorption band being characteristic of the component to be detected. In one example, filters are interposed between front and rear cells for broadband, i.e., nonselective attenuation. Alternatively, the rear cells are connected to a reservoir of the same gas to attenuate pressure variations. Either case enhances frequency selectivity by reducing cross sensitivity.

REFERENCES:
patent: 2844066 (1958-07-01), Friel
patent: 2898800 (1959-08-01), Bergson
patent: 2951939 (1960-09-01), Luft
patent: 3725702 (1973-04-01), Schaefer
patent: 3925667 (1975-12-01), Staab
patent: 3953734 (1976-04-01), Dimeff
patent: 4156812 (1979-05-01), Staab

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