(1) Night vision

　　 When the visibility is low and the light is insufficient, infrared rays are used for night vision equipment. When the night vision device is working, it will actively illuminate the target and then use the target to reflect the infrared light of the infrared source to implement the night vision technology of observation. This corresponding device is a night vision device.

　　 (2) Thermal imaging

　　 uses the infrared radiation emitted by the infrared emission tube to reach the target, and finds the target through the temperature difference between the surrounding and the target (thermal radiation). It can be used in harsh environments, such as fog, rain, and snow. It has a long range, can recognize camouflage and prevent interference.

　　 (3) heating

　　 Infrared radiation can be used as a commonly used heating source, such as: infrared sauna, removing ice formed when airplanes are at high altitude, and coating curing, annealing, plastic forming in industrial manufacturing and other applications. In these applications, infrared heaters have also been derived to replace convection ovens.

　　（4）Communication

　　 Transmit infrared signal through infrared emission tube. The infrared receiving tube completes a series of processes such as receiving, amplifying, and detecting the waveform of the infrared signal, and demodulates the remote control code pulse to realize the communication effect.