G - Physics
01
N
G01N 21/00 (2006.01) G01N 21/03 (2006.01) G01N 21/59 (2006.01)
Patent
CA 2212432
A gas monitor includes an infra-red source 5 enclosed within a housing 2 having inner surfaces which are reflective. Radiation emitted from the source 5 reflects off ellipsoidal surfaces 7 and 8 and intermediate planar surfaces 3 and 9 to be focussed at a sensor 6, 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 7 and 8 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.
Doncaster Alan Mason
Parry Michael
E2v Technologies (uk) Limited
Eev Limited
Kirby Eades Gale Baker
LandOfFree
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