Device for the remote optical detection of gas

A transportable and self-contained remote optical gas detection device for continuous monitoring of an observed site, the device comprising 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 infrared lens and the detector and including power-driven means for successively bringing each filter onto the sighting axis of the infrared lens and detector, the detector being attached to a power-driven support guided in movement inside the detection housing for adjusting the optical focus based on operating conditions for compensating a thermal drift without any spatial modification of a scene observed, in terms of field and analysis resolution, the detection housing further 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.