Gas monitors

Details Gas monitors Gas monitors

1997-08-05

1999-10-26

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

2503418, 250353, 250373, 356437, G01N 2161

Patent

active

059733268

ABSTRACT:
A gas monitor includes an infra-red source enclosed within a housing having inner surfaces which are reflective. Radiation emitted from the source reflects off ellipsoidal surfaces and intermediate planar surfaces to be focussed at a sensor, being reflected five times. Radiation is absorbed by gas within the housing and a comparison of the source intensity and detected intensity gives a measure of the gas concentration. Use of ellipsoidal reflective surfaces directs emitted radiation along a plurality of routes having substantially the same path length, hence giving an accurate measure of the gas concentration with a compact device. In another embodiment, off axis parabolas are used to direct the radiation through the gas.

REFERENCES:
patent: 3911277 (1975-10-01), Cederstrand et al.
patent: 3921158 (1975-11-01), Anderson
patent: 4266219 (1981-05-01), Foster et al.
patent: 4657397 (1987-04-01), Oehler et al.
patent: 5170064 (1992-12-01), Howe
patent: 5440127 (1995-08-01), Squyres
patent: 5550375 (1996-08-01), Peters et al.

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