The functions of the infrared sensor are as follows: it can perceive certain characteristics of the surrounding environment. Infrared sensor is a sensor that uses infrared for data processing. It has the advantages of high sensitivity. Infrared sensor can control the operation of the drive device, also known as infrared light, which has the properties of reflection, refraction, scattering, interference, absorption, etc., including optical system, detection element and conversion circuit. The optical system can be divided into transmission type and reflection type according to different structures; the detection element can be divided into thermal detection element and photoelectric detection element according to the working principle. Infrared sensors are commonly used in non-contact temperature measurement, gas composition analysis and non-destructive flaw detection, and are widely used in fields such as medicine, military, space technology and environmental engineering.