Research On High Precision Adjusting System For Laser Light Path Of Compton Light Source ?

Since entering 21 th century,spaceflight activities of each country develops prosperously,in China,a lot of strategies and programs for spaceflight development are prepared with actual demand and long term objective of national development of our country as the guideline,while rapid development of Chinese aerospace raises higher and higher requirement for all kinds of equipment serving aerospace industry undoubtedly,as a kind of effective load for space exploration,X/? detector plays key roles in all kinds of space exploration activities.But the existing calibration resources could hardly meet the accuracy requirement in the application of space exploration.To this end,a good mono-chromaticity and continuously energy adjustable light source within the scope of KeV~MeV meeting the requirement of high precision calibration for space detector is urgently needed.Compton scattering will be happened when incident photons collide with high-velocity electrons and then ? photon occurs,by using such a approach,qualified ? light source might be obtained.Through analysis,a high precision adjusting system for laser light path which could make laser beam of all 20?m waist radiuses to collide with electron beam with precise variable angle is needed to be designed.By researches to domestic and overseas micro locating platform,a adjusting system for laser light path meeting the requirement is designed in the thesis,core structure-three degree of freedom flexible laser-bounce mirror mounts in the system is detailed designed and analyzed,the adjusting mirror mounts adopts a manner of flexible chain transmission and piezoelectric ceramics motor driven,its positional accuracy of angular displacement could reach to 0.0004°,translation regulation precision could reach to 1?m.By building pseudo rigid body model of adjusting mirror mounts,kinematics analysis is made to mechanism of mirror mounts and its displacement output theoretical equation as well as stiffness model is established.By finite element analysis software,stress distribution and simulation of displacement under simulating actual working situation are made to mirror mounts.By comparison of simulation result and theoretical result,correctness of theoretical model is verified.In order to enhance systematic locating positional accuracy,all kinds of factors that might influence accuracy of adjusting system for laser light path was theoretically researched and analyzed in the thesis,and the action law of each kind of error is found,then a certain error compensation method is raised.Finally,through analysis of controlling system of adjusting system for laser light path,a closed loop controlling system with CCD camera as the feedback element is built,by making use of Simulink software to make simulated analysis to PID controlling system and fuzzy PID controlling system,and set up the experimental platform,relative superiority of fuzzy self-tuning PID controlling system is both tested by simulated and experimental result.