机载光电平台球罩的视轴指向误差

韩松伟; 项阳; 刘洵; 孟中; 毛大鹏; 吴志勇; 王国华; 丁金伟; 李永刚

光学精密工程, 2009, 17 (10): 2385, 网络出版: 2010-08-31

机载光电平台球罩的视轴指向误差

Effect of spherical shell of airborne electro-optical platform on optical axis pointing precision

论文大纲

韩松伟 ^*项阳刘洵孟中毛大鹏吴志勇王国华丁金伟李永刚

作者单位

中国科学院长春光学精密机械与物理研究所，吉林长春 130033

光电平台玻璃球罩视轴指向精度 electro-optical platform glass spherical shell optical pointing precicion

摘要

机载光电平台光学镜头前的通光窗口须选用内外球心重合的等厚球形玻璃球罩，这是由于球罩在加工过程中产生的内外表面球心不重合会给视轴指向精度带来附加误差。本文根据光路图推导出了产生这种误差的数学表达式，分析了内外球心偏离对视轴指向精度的影响，进行了相关实验并对实验数据进行处理。实验结果表明，实测数据与数学理论推导结果吻合得很好。当某机载光电平台球罩的内外表面球心沿视场中心线的偏离达到0.26 mm时,45°视场处的视轴指向误差实测值达到0.075°,超出了0.029°(0.5 mrad)的允许值。为了将球罩加工误差带来的视轴指向偏差减小到理想值0.017°(0.3 mrad)以内，内外球心偏离必须控制在0.10 mm以内。根据分析结论重新加工了球罩内外表面，将球罩内外球心偏离控制在0.1 mm以内后，视轴误差均满足要求。

Abstract

A concentric glass spherical shell with a uniform thickness is usually chosen as the transparent window mounted in front of the optical lens of an airborne opto-electronic platform,becaused the misalignment of the spheric centers on inside and outside surfaces produced by the fabrication can cause additional pointing errors. In this paper, the theoretical expression of addition pointing error based on an optical path is derived and the effect of the misalignment of the spheric centers on inside and outside surfaces on the pointing accuracy of a sight axis is analyzed. Several kinds of experiments are undertaken and the data processing result of the experiment indicates that the measurement results are in agreement well with the theoretical results. When the concentric misalignment of a spherical center is 0.26 mm, the axial pointing error at a 45° field of view reaches 0.075°,which is higher than the error limitation 0.029° (0.5 mrad).Analyzed results also show that the concentric misalignment should be controlled below to 0.10 mm in order to reduce the pointing error to 0.017°(0.3 mrad). Based on the analyzed results,the inside and outside surfaces of the spherical shell is reprocessed,the experimental results demonstrate that the pointing error is acceptable when the concentric misalignment is controlled in 0.10 mm.

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韩松伟, 项阳, 刘洵, 孟中, 毛大鹏, 吴志勇, 王国华, 丁金伟, 李永刚. 机载光电平台球罩的视轴指向误差[J]. 光学精密工程, 2009, 17(10): 2385. HAN Song-wei, XIANG Yang, LIU Xun, MENG Zhong, MAO Da-peng, WU Zhi-yong, WANG Guo-hua, DING Jin-wei, LI Yong-gang. Effect of spherical shell of airborne electro-optical platform on optical axis pointing precision[J]. Optics and Precision Engineering, 2009, 17(10): 2385.

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