The principle of the laser infrared rangefinder is to use the laser beam emitted by the laser beam transmitter, which is focused by a lens to form a light spot, and then the laser beam is irradiated on the target object to be measured and reflected back. In the process of the laser beam from the transmitter to the target object and then returning to the receiver, the distance between the target object and the laser infrared rangefinder can be calculated by measuring the time difference between the laser beam emission and return.

The specific principle is to use the relationship between the propagation speed of light and time. After the laser beam transmitter emits the laser beam, the timing is started by controlling the clock in the receiver. At the same time, after the laser beam is irradiated on the target object and reflected back, it passes through the receiver again and is detected by the detector in the receiver. When the detector in the receiver receives the reflected laser beam, the timing stops. By measuring the time difference between the laser beam emission and return, the distance between the target object and the laser infrared rangefinder can be calculated.