The basic method of infrared led detection is divided into two types: passive and active. Passive infrared detection equipment in the application more; active infrared detection can be divided into single and double-sided method, in infrared detection method of heating method measured target is divided into steady and unsteady heating heating.Infrared detection instrument installation and delivery modes: fixed, portable, vehicle mounted and airborne type (helicopter loading) etc..
(1) the passive infrared detection means
The measured target don’t hot up when check of infrared detection, using only measured target temperature to draw infrared detection on process of heat exchange between the measured target and environment。passive infrared detection used in the operation of device,components and scientific experiment。It no additional heat source，the basic all adoption with this way。
(2) active infrared detection of active infrared detection is the infrared detection before measured object active heating, heating source from the measured target. Way of make heat divided into a steady and non steady。infrared detection according to the different situation can be carried out in the heating process,also can be in stop heating for a certain period of time after continue their detection.