Study Of High-precision Laser Range Finder Hardware Circuit

Probed into the exploitation of the high precision laser ranging, andbased on the technical specifications, the paper attempted to solve the problemthat the precision is low in the measurements of laser ranging, gave a deeplyresearch in the hardware design of the laser phase-shift ranging.At the beginning, the paper introduced the developments and applicationsof the laser ranging: gave a detailed depiction in principles of the laserranging, particularly introduced the laser phase-shift ranging, and chose asuitable ranging mode.Next, the paper investigated the theories of the laser diode, and designeda drive circuit which could be auto power controller(APC); designed atime-lapse and slow-start circuit, realized stable transmit of the lasersignals: gave a simple research to the frequency synthesizers based onphase-locked loop circuits.Then, the paper proposed an amplifier circuit, investigated the photodiodemonitoring: designed a circuit which had two optoelectronic channels, analyzedthe noises in optoelectronic detectors, and discussed the methods of reducingthe noises.Then after, the paper analyzed various interferences of the circuit boardwe designed, proposed effective solutions.At last, it is explained the test results and the progress of the work,gave some experience sum-up to the exploitation of the laser phase-shiftranging.