Device for the remote optical detection of gas

A remote optical gas detection device, comprising an infrared camera associated with measuring and reference filters mounted successively on the sighting axis of the camera, and means for processing the signals supplied by the camera and corresponding to the fluxes of at least two areas of different temperature of an observed region, characterised in that it includes a detection housing connected to an electrical power supply unit, the detection housing comprising an infrared detector with a matrix of photodetectors, an infrared lens mounted in front of the detector, a filter assembly held by a rotating disk, this assembly being arranged between the lens and the detector and including power-driven means for successively bringing each filter onto the sighting axis of the lens and detector, the detection housing likewise including electronic boards for controlling the detector, for acquiring and digitizing the infrared signals and for controlling the means of rotating the disk carrying the filters, and a processor responsible for controlling the operation of the detection housing and for applying gas detection algorithms to the signals supplied by the detector.