The infrared range finders uses the principle that the reflection intensity of the infrared signal is different when it encounters an obstacle. In the
rangefinder there are infrared signal transmitting and receiving diodes. After the transmitting tube emits an infrared signal of a specific frequency, the receiving tube receives the signal reflected by the obstacle, and the distance between the obstacles can be obtained after digital processing. Briefly, the beamwidth time t is calculated using the phase shift of the high frequency modulated infrared light at the distance to be measured. Therefore, the distance D=ct/2 (c is the propagation speed of infrared rays).
