Infra-red light absorption gas detector

Details Infra-red light absorption gas detector Infra-red light absorption gas detector

1984-09-28

1986-05-20

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250339, 250343, 350 16, 350166, G01N 2127, G02B 528

Patent

active

045903743

ABSTRACT:
A gas detector arrangement, e.g. for detecting carbon dioxide, includes an infra-red source, a photodetector and band pass filter disposed in the light path therebetween. The arrangement includes means for oscillating the pass-band of the filter across an absorption band edge of the gas to be detected. The arrangement is portable and may be installed in diving apparatus.

REFERENCES:
patent: 2834246 (1958-05-01), Foskett et al.
patent: 3940623 (1976-02-01), Hempowitz et al.

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