Infra-red light absorption gas detector
AssigneeInternational Standard Electric Corporation
InventorArthur E. Brewster
Life of this patent
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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.
Claims5
An arrangement for detecting and measuring the concentration of a gas having an infra-red absorption band, the arrangement including a light source and photodetector, a multilayer interference filter disposed in the light path between the source and detector and supported on a single crystal silicon substrate, and means for vibrating the filter such that its transmission peak oscillates across the absorption band edge of the gas to be detected.
Dependencies are inferred from the claim text.