With the development of photoelectric information, microelectronics, network communications, digital video, multimedia technology and sensing technology, highly integrated digital, intelligent, network security monitoring technology from traditional analog to. With increasing market demand, the modern high-tech almost have applications in the security surveillance systems or upcoming application. Modern sensor technology in the rapid development of infrared thermal imaging technology in the security system also began to be applied.

Infrared Thermal Imaging
The wavelength of visible light that our eye can perceive :0.38-0.78 micron. We usually than 0.78 microns long electromagnetic waves, called infrared. Nature, all objects are infrared radiation, so the use of the detector was measured the infrared difference between the target itself and background, you can get different infrared image, called a thermal image.