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北京理工大学 光电学院 精密光电测试仪器及技术北京市重点实验室, 北京 100081
E-mail: qiugrass@126.com
收稿日期:2021-03-05,
修回日期:2021-03-30,
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李彦宏,杨帅,唐顺等.后置分光瞳差动共焦曲率半径测量[J].光学精密工程,
LI Yan-hong,YANG Shuai,TANG Shun,et al.Detecting divided aperture laser differential confocal radius measurement[J].Optics and Precision Engineering,
李彦宏,杨帅,唐顺等.后置分光瞳差动共焦曲率半径测量[J].光学精密工程, DOI:10.37188/OPE.2021.0122
LI Yan-hong,YANG Shuai,TANG Shun,et al.Detecting divided aperture laser differential confocal radius measurement[J].Optics and Precision Engineering, DOI:10.37188/OPE.2021.0122
为了提高曲率半径的测量精度,提出后置分光瞳激光差动共焦曲率半径测量新方法。本文对后置分光瞳差动共焦测量原理、虚拟针孔定位算法进行研究。首先,在共焦测量系统的探测光路中通过D型光阑遮挡,使一半测量光束聚焦在焦面探测CCD,接着,采用虚拟针孔定位算法对该CCD探测的艾里斑进行分割焦斑差动相减归一化探测,然后利用差动共焦曲线的零点对被测件的“共焦”位置和“猫眼”位置进行精确定焦并测得它们之间的距离,最终实现曲率半径的高精度测量。实验和分析表明:该方法测量曲率半径为
-
121.209 4 mm,测量重复性优于5×10
-6
,而且无需根据测量物镜和被测镜的参数进行硬件调整。不仅满足曲率半径高精度测量需求,还实现光路结构的简化和研制装调成本缩减,为曲率半径高精度、快捷测量提供新途径。
In order to improve the measurement accuracy of curvature radius, a new method of detecting divided aperture laser differential confocal radius measurement is proposed. In this paper, the principle of this new measurement and the algorithm of virtual pinhole positioning are studied. Firstly, the detection light path of the confocal measurement system is blocked by a D-type aperture, so that half of the measurement beam is focused on the focal plane detection CCD. Next, the Airy disk detected by the CCD is divided into focal spot differential subtraction normalized detection using the virtual pinhole positioning algorithm, and then use the zero point of the differential confocal curve to accurately determine the focus of the "confocal" position and the "cat's eye" position of the test lens and measure the distance between them. Finally a high-precision measurement of the radius of curvature is achieved. Experiments and analysis show that the radius of curvature measured by this method is -121.209 4 mm, and the repeatability is better than 5×10
-6
, and there is no need to adjust the hardware according to the parameters of the measuring objective lens and the tested lens. It not only meets the requirements for high-precision measurement of the radius of curvature, but also realizes the simplification of the optical path structure and the reduction of the cost of structure and adjustment, providing a new way for high-precision and quick measurement of the radius of curvature.
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