综合诊断光路快速自动准直系统设计与实现

Design and Implementation of Integrated Diagnostic Beam Fast Automatic Alignment System

为了实现综合诊断光路全程快速准直,从并行处理、快速收敛电机运动模型和最小外切圆特征点提取三个方面对自动准直系统进行了总体设计.首先,对全部准直步骤采取并行、串并结合的方式执行,并将关键准直任务归纳成单元准直模型;其次,使用准直数学模型,实现单元准直模型中电机的快速收敛;最后,针对小孔图像灰度对比低、分布极不均匀、光斑很不完整的特点,提出在最小外切圆的圆环上,取两两距离最大的100个点为特征点,使用最小二乘法进行圆拟合法计算小孔图像圆心.研究表明优化后系统的准直时间从优化前40min减少到8min,小孔图像圆心误差在2个像素之内,满足打靶实验的要求.

Parallel processing, fast convergent motor model and characteristic points extracted from the smallest outer circle were proposed to design the automatic alignment system, which can integrated diagnostic fast automatic alignment. First, all the alignment steps were executed in parallel and serial- parallel mode, and the important steps were reduced to unit alignment model. Second, the mathematical model for fast automatic alignment was used and the fast convergent algorithm of the unit alignment model was implemented. Finally, according to the characteristics of small laser spot, which contrast was low, distribution was asymmetrical, spot was not complete, the 100 characteristic points were extracted from the smallest outer circle and any two points distance was maximal, then a new method of circle fitting using least square method to calculate small laser spot center was proposed. Through the improvement of the above three aspects, alignment time reduced from 40 minutes to 8 minutes before the three aspects were optimized, the error of small laser spot centre is less than 2 pixels, and meet the experiment requirements.