All objects over absolute temperature radiate infrared energy and can therefore be detected by passive systems like an infrared camera. Unlike sensors using for detecting reflecting visible light infrared detectors can work either in total darkness or in very luminous or shiny scenario. Also are better coping with haze, smoke, wet weather even in some dust environment. This gives the chances to record information no visible to human eye valid to take action at the right moment and at the right place. As the time lapses the infrared thermography in surveillance, safety and rescue as becoming a technique of countless applications and limited only for the imagination of the user.