Research On Beam Pointing Stability Control Technology

Based on the current mainstream laser applications,this paper expounds the important significance of beam pointing stability control technology in the fields of communication,medical treatment,military,processing and other laser applications.Based on the analysis and comparison of the research work of beam pointing stability control technology at home and abroad,this paper uses the fast steering mirror compensation method to carry out the research of beam pointing stability control technology in the field of laser precision machining.In this paper,the working principle and main parameters of the core equipment of the system are studied,and the beam pointing offset model is established according to the position detection and fast steering mirror compensation feedback control principle.On this basis,the system optical path is designed and improved,and the design of mechanical and equipment communication is further completed to match the optical path.The core control algorithm of the system is studied and the system simulation test is carried out.The upper computer software is developed to package the algorithm and control the core equipment.An Opto-mechatronic system based on fast steering mirror offset compensation is realized,and its control performance is verified by experiments.The main contents of this paper are as follows.1.The working principle and parameters of the core equipment components of the system are studied,and the influence of the main parameters on the control performance of the system is analyzed.Based on the beam pointing model,a control method combining two groups of position detectors with the closed control loop of the fast steering mirror is proposed,and the optical path design of the system is completed.According to the optical path design,the mechanical structure design and equipment communication design of the system are completed,which provides hardware support for the beam transmission and algorithm implementation of the system.2.The relationship between the spot position and the compensation angle in the system is studied,and the closed-loop feedback control model of parallel single input single output is established.The PID feedback control algorithm is studied,the mathematical relationship between the three control items involved in the algorithm and their corresponding coefficients is clarified,and the PID control structure of the system is designed by comprehensively considering its action mechanism and debugging method.The Simulink tool in MATLAB software is used to simulate and test the control system,and a good control effect is obtained,which verifies the control stability of the system.The upper computer software of the system is developed.The software development process is described from the aspects of software file structure,program structure,interface design,control flow,etc.,and the final effect is shown.The optical electromechanical integration design of beam pointing stability control technology is completed.3.According to the characteristics of the actual application scenarios of laser precision machining,the control performance verification experiment of the system in different interference environments is designed.When the laser beam passes through different transmission distances of 0.5 m,1 m,1.5 m and 2 m,the system can stabilize the pointing offset range of the beam at 10 μ Within rad from 50 μ Within rad,high beam pointing stability control performance is achieved.