The working principle of optical range finder
The method of phase ranging with the equivalent of "light feet" instead of steel tape distance, and lambda /2 light length
The measuring principle of phase photoelectric range finder is that the light emitted by the light source passes through the modulator to become modulated light whose intensity varies with the high frequency signal. The distance is calculated by measuring the phase difference between the modulated light and the transmitted distance at the distance to be measured.
According to the measuring time t, the photoelectric range finder is divided into the direct measuring time pulse ranging method and the indirect measuring time phase measuring method. The phase finder is usually used in high precision range finder.
