ON-BOARD CALIBRATION OF A PIXEL ARRAY OF AN INFRARED SENSOR

The invention relates to a method for in situ calibration of a pixel array of an infrared sensor, said infrared sensor comprising: an optical system (2); and a pixel array (3) disposed in the focal plane (4) of the optical system (2), said optical system (2) allowing radiation to be focused on the pixel array (3). The method comprises the following steps carried out in a processing unit (7) connected to the infrared sensor, with the pixel array being characterised by a pixel gain table: acquisition (E2) by the pixel array of a first sequence of images of the radiation from a black screen (CN) corresponding to a scene at a first temperature; acquisition (E4) by the pixel array of a second sequence of images of the partially reflected radiation from the pixel array corresponding to a scene at a second temperature; processing (E5, E6, E7, E8, E9) of the first and second image sequences such as to update the gain table by calculating a correction representative of the aging and response of the pixels of the pixel array.