Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1992-12-03
1994-04-26
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250330, G01N 2135
Patent
active
053069137
ABSTRACT:
A method and apparatus for remote optical detection of a gas present in an observed volume using a thermal imager or camera including one or more sensitive elements which are sensitive to radiant fluxes in a determined band of wavelengths, two filters interposable on the optical axis of the camera, the filters having similar transmission bands, one of which includes an absorption line characteristic of the looked-for gas, while the other of which is complementary to said absorption line, and signal processing means for taking the difference between the radiated fluxes received from two points at different temperatures in the volume as observed first through one of the filters and then through the other filter, for taking the ratio of said differences, and for deducing therefrom whether the gas is present in the observed volume.
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Guern Yves
Noack Jean-Claude
Pelous Gerard
Bertin & Cie
Hannaher Constantine
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