Infrared rangefinder is an instrument that uses modulated infrared light for precise ranging, and the range is generally 1-5 kilometers. The principle of non-diffusion of infrared rays is used: because infrared rays have a small refractive index when they pass through other substances, long-distance rangefinders will consider infrared rays, and the propagation of infrared rays takes time. When infrared rays are emitted from the rangefinder The reflective object is reflected back and received by the rangefinder, and then the distance from infrared can be calculated according to the time from infrared to being received and the propagation speed of infrared. The advantage of infrared ranging is that it is cheap, easy to manufacture, and safe. , the distance is short, and the directionality is poor. Infrared rangefinder and ultrasonic rangefinder technology are relatively backward, and now the general concept of infrared rangefinder, that is, laser rangefinder.
