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内转式进气道异形面光学窗口设计及成像畸变修正

Heteromorphic Optical Window Design and Imaging Distortion Correction for Inward-Turning Inlet

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摘要

基于光线轨迹跟踪,提出一类内表面保形、外表面修正,且双侧窗口对称的异形面光学窗口设计方法,设计了异形面光学窗口。搭建异形面光学窗口实验系统,研究了通过光学窗口观测到的流场图像畸变特性及其修正方法,提出了二阶多项式成像畸变的修正模型,并对畸变图像进行修正。结果表明:平行光经过异形面光学窗口后有明显的偏折,导致亮度分布不均匀,存在亮带和暗斑;同时,使棋盘格标定板的图像发生平移、缩放和旋转,不同位置处的畸变特征不同。构建畸变图像修正模型,对畸变图像进行修正,修正后的图像与原图像基本重合,各角点坐标差值小于1 pixel(7.4 μm),说明修正模型具有较高的精度。异形面光学窗口的设计及修正模型的发展有助于获得精确的内转式进气道异形曲面的流道内部流场结构和流动特性。

Abstract

This work proposes a strategy of designing the optical heteromorphic window which comprises a pair of symmetrical conformal internal surface and correction external surface that are determined using ray tracing. An experimental system is set up to analyze the characteristics and correction of image distortion of the optical heteromorphic window. A correction model of two-order polynomial imaging distortion is proposed and then applied to distorted image correction. The results show that after passing through the optical heteromorphic window, the parallel light has obvious deflection, resulting in uneven brightness distribution and bright and dark spots. At the same time, the image of the calibration board is translated, zoomed, and rotated, and its distortion characteristics at different positions are different. By constructing the correction model, the distorted image is corrected, and the corrected image is highly coincident with the original image. The coordinate difference of each corner point is less than 1 pixel(7.4 μm), demonstrating that the correction model has high precision. The design of the optical heteromorphic window and the development of the correction model contribute to obtaining an accurate internal flow field structure in the inward-turning inlet.

Newport宣传-MKS新实验室计划
补充资料

中图分类号:V11

DOI:10.3788/AOS201939.1211004

所属栏目:成像系统

基金项目:能源清洁利用国家重点实验室开发课题;

收稿日期:2019-07-03

修改稿日期:2019-09-02

网络出版日期:2019-12-01

作者单位    点击查看

郭鹏宇:中国空气动力研究与发展中心超高速空气动力研究所高超声速冲压发动机技术重点实验室, 四川 绵阳 621000
薛志亮:浙江大学热能工程研究所能源清洁利用国家重点实验室, 浙江 杭州 310027
林文辉:浙江大学热能工程研究所能源清洁利用国家重点实验室, 浙江 杭州 310027
汪磊:浙江大学热能工程研究所能源清洁利用国家重点实验室, 浙江 杭州 310027
吴迎春:浙江大学热能工程研究所能源清洁利用国家重点实验室, 浙江 杭州 310027
余安远:中国空气动力研究与发展中心超高速空气动力研究所高超声速冲压发动机技术重点实验室, 四川 绵阳 621000
吴颖川:中国空气动力研究与发展中心超高速空气动力研究所高超声速冲压发动机技术重点实验室, 四川 绵阳 621000
吴学成:浙江大学热能工程研究所能源清洁利用国家重点实验室, 浙江 杭州 310027

联系人作者:吴迎春(wycgsp@zju.edu.cn)

备注:能源清洁利用国家重点实验室开发课题;

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引用该论文

Guo Pengyu,Xue Zhiliang,Lin Wenhui,Wang Lei,Wu Yingchun,Yu Anyuan,Wu Yingchuan,Wu Xuecheng. Heteromorphic Optical Window Design and Imaging Distortion Correction for Inward-Turning Inlet[J]. Acta Optica Sinica, 2019, 39(12): 1211004

郭鹏宇,薛志亮,林文辉,汪磊,吴迎春,余安远,吴颖川,吴学成. 内转式进气道异形面光学窗口设计及成像畸变修正[J]. 光学学报, 2019, 39(12): 1211004

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