提高CCD激光自准直测角精度的硬件方法

设计了一个CCD激光自准直测角系统。为提高系统的测量精度和实时性，对系统中的硬件参数进行研究，有效改善了采集到图像的质量。降低数据处理难度的同时，缩短了图像处理时间和提高了系统的测量精度。对系统中小孔光阑的直径，CCD的积分时间，会聚镜头的焦距值，采集卡的亮度和对比度参数分别进行分析，寻找优化值对系统进行改进。对改进前后的系统进行对比实验，实验结果表明，改进后系统的测角精度由原来的5.0″提高到了1.0″，处理一帧图像的时间缩短到了0.417s。

Changing hardware parameters to improve the measuring accuracy of CCD laser autocollimator

A novel CCD laser autocollimator was discussed. In order to improve test accuracy and real-time performance of the measuring system, a method based on hardware parameters study was proposed to meliorate the quality of spot image. The computation of image processing can be simplified and the processing time was saved also the measuring precision was improved especially. Size of small aperture, CCD integral time, focal length of objective, brightness and contrast parameters of image data acquisition card were adjusted respectively to optimize the autocollimator. In the end, experiments of contrasting the accuracy of system before and after optimizing were carried out. The experimental results show that the measuring accuracy has been achieved from 5.0 arc-seconds to 1.0 arc-second in 0.417s.