Abstract: The invention concerns a method and device, for remote sensing of objects that emit variable thermal emissions having phases, which may include: A. acquisition of a map of the radiation coming from the surface of the portion of space within or behind the object to be sensed at least at a first time t1 and a second time t2, such times being successive to each other; B. acquisition of a map of the radiation coming from the surface of said portion of space at a third instant t*; C. summation of the maps of at least two times t1 and t2; D. subtraction of the map at time t* from the sum from the sum of phase C as well as other phases.