摘要
为满足高功率激光驱动器光束自动准直的高精度和实时性要求,提出了一种快速高精度的自动准直目标定位算法。首先利用变结构元广义数学形态学边缘检测算法在充分提取图像边缘细节信息的同时抑制图像噪声的影响,然后采用拉格朗日多项式插值算法对圆目标轮廓进行快速亚像素定位,最后利用最小二乘拟合以及几何形心拟合的方法实现图像中光斑目标中心的精确定位。该算法在神光Ⅱ升级装置的光路自动准直中得以验证,实验结果表明八路预放光路准直时间小于3min,主放光路准直时间小于7min,主放输出光束近场准直准确度优于0.2%,远场指向准确度优于0.2″(RMS)。
To meet the requirements for high accuracy and real time performance of high power laser driver beam automatic alignment,a fast and precise center location method for target of high power laser driver beam automatic alignment is proposed.The specific characteristics of the target edge are fully extracted by using multiple structuring elements-based generalized morphological edge detection,while the influences of the noises on images are diminished.Then,the edge is quickly located in sub-pixel precision by adopting the Lagrange polynomial interpolation method,at last the center position of the spot target in image is accurately acquired by using circle fitting method based on least square fitting method and geometric centroid.This algorithm is verified in the ShenguangⅡ upgrade device,the alignment time of eight prelight roads is less than 3 min,and the alignment time of the main light path is less than 7 min.The main output of the near-field beam collimation accuracy is better than 0.2%,and the far field accuracy is better than 0.2″（RMS）.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2013年第9期2203-2207,共5页
High Power Laser and Particle Beams
基金
国家高技术发展计划项目
中日韩激光聚变高能量密度物理合作研究资助课题
国家自然科学基金青年基金项目(61205137)
关键词
自动准直
图像处理
变结构元广义数学形态学算法
拉格朗日多项式插值
automatic alignment
image processing
multiple structuring elements-based mathematical morphology
Lagrange polynomial interpolation
作者简介
李红（1986一），女，助理研究员，主要从事高功率激光光束控制与准直方面的研究；hongli_0309@163．com。
