Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1984-04-03
1985-12-24
Smith, Alfred E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250339, 250353, G01J 100, G01J 142
Patent
active
045608750
ABSTRACT:
An infrared absorption gas detector uses the amount of IR radiation of a particular wavelength to indicate the presence of a particular component or gas. A monitoring head for such a detector includes a source (8) of IR radiation, dual IR detector elements (17, 18), an optical path which extends between the source and the elements and which includes a gas sample volume, and selectively transmitting spectral filters (20, 21) immediately in front of the detector elements (17, 18) to filter the radiation impinging on them. The optical path also includes a concave mirror (9) to provide a converging beam of radiation concentrated onto both elements of the detector. The location of the gas sample volume, the separation of the two detector elements (17, 18) of the detector, and the mirror are arranged so that IR radiation emitted by the source and impinging upon each of the detector elements follows a substantially common path through the gas sample volume. The monitoring head operates, in effect, as a single beam in both space and time while having no moving parts.
REFERENCES:
patent: 4320297 (1982-03-01), Cederstrand et al.
patent: 4358679 (1982-11-01), Lipoma
patent: 4437005 (1984-03-01), Ophoff et al.
EIGD Limited
Smith Alfred E.
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