Automatic Collimation Controlling Technology Of Photoelectricity Detecting System

In the applications of laser communication or laser guiding or laser measure or lidar,we will fall across the problems of capturing or tracking of laser beam.Due to the vibration of equipments or atmosphere transmission environment,the facula being received will drift.For being able to aiming at the object automatically, is requested that the photoelectricity incepting system can capture the drift of facula and adjust the position of the receive equipment to ensure that the beam is in the effective receiving range.The paper puts forward a plan of auto-collimation technology to ensure that the atmosphere-radiancy photoelectricity detecting system can incept the light signal more accurately and that the receiving equipment can adjust the 2-Dimension position in time, so as to the laser beam can irradiate on the centre of target steadily. The controlling precision of system is demarcated to be less than 10p.m.In the article,we have discussed the trait of some kind of detector and put forward a plan of auto-collimation system based on the four-quadrant photodetector. We introduced the working principle of the four-quadrant detector and designed the amplifier,filter and A/D Signal Acquisition Circuit with special Integrated Circuits based on Characteristics of Signal from detector.Based on the demand of auto-collimation system,we designed the control cell with SCM AT89C51 to control the course of system and process the data in the working course.In order to realize the exact displacement of the incepting equipment,we designed the 2-Dimension stepping system with driving circuit and stepping motor.In the paper,we introduced the driving circuit detailedly and analyzed the capability.In the article,we also have designed the program of the control system and analyzed the function of every segment.At last,the whole system was built up and debugged.The run of the system indicates its veracity, reliability and the facility.The whole system settled for the requirement of design and the method can be used to control various laser beam auto-collimation systems widely.