激光聚变实验中诊断设备反馈控制瞄准技术

Feedback control aiming technology of diagnostic equipment in laser confusion experiment

中文关键词  诊断设备  自动瞄准  图像识别  函数拟合  反馈控制

英文关键词  diagnostic equipment  automatic aiming  image recognition  function fitting  feedback control

中文摘要

      在激光惯性约束聚变实验中，为实现诊断设备高精度自动瞄准，提出了一种采用靶图像自动识别，诊断设备离线标定，诊断搭载平台反馈控制的自动瞄准技术。首先，为计算像素偏差，自动确定出目标靶点的中心坐标；其次，对诊断设备瞄准系统进行离线标定，通过函数拟合建立起真实靶点的空间位置偏差与图像像素偏差间的关系；最后，根据通用诊断搭载平台的运动控制理论，由计算出的空间位置偏差对诊断搭载平台进行反馈控制从而实现高精度自动瞄准。在离线情况下通过微米级平移台控制靶点运动模拟靶点与诊断设备的相对运动，通过5次反馈控制测得瞄准精度。将诊断设备搭载在通用诊断搭载平台上进行在线验证，对于一般瞄准精度要求不高的诊断设备，经过两次反馈控制得到的瞄准效果即可满足实验需求，对于瞄准精度要求较高的诊断设备，经过五次反馈控制则可达到优于50μm的瞄准精度。瞄准效率得到了很大改善。

英文摘要

      In order to realize high precision automatic pointing technique to the target by the diagnostic instrument in the inertial confinement fusion experiments, an automatic aiming technique is proposed, which includes the automatic image recognition technique, the off-line calibration technique of the diagnostic equipment, and the feedback control technique of the diagnostic instrument manipulator. First, the center of the target is determined so as to find the pixel deviations; Second, the offline calibration of the aiming system is implemented, and the relationship between the spatial deviation of target and pixel deviation is obtained by fitting; Third, according to the control theory of the diagnostic instrument manipulator movement and the target spatial deviation, the feedback control of the diagnostic instrument manipulator is executed to realize high precision automatic aiming. The target movement is controlled off-line by the micro level translation platform to simulate the relative movement of the target and the diagnostic equipment, and the convergence accuracy is obtained through 5 steps in feedback control. The aiming technique was tested by a diagnostic instrument online. For the instrument with a relatively large tolerance, twice feedback control can meet the aiming requirements, and for the instrument with high precision requirements, five steps feedback control can achieve a pointing deviation of less than 50μm. The aiming efficiency of the diagnostic instruments is improved much.