航空相机大面阵CCD多自由度拼接方法研究
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摘要
随着科学技术的进步,航空相机向着高分辨率、大视场方向发展,现有单片CCD不能满足大视场的要求,高精度、多自由度的CCD拼接技术已成为当前发展的迫切需求。通过对比现有拼接技术的优劣,提出了一种新的大面阵CCD多自由度机械交错拼接技术,采用三点凸轮式多自由度拼接机构,取代传统修磨垫片方式,拼接时可在线实时调整。对拼接精度进行分析,结果表明,该方法的搭接误差<2μm,共面误差<4μm,满足航空相机大视场和高分辨率要求;对拼接结构进行模态仿真分析与模态测试实验,拼接机构一阶谐振频率大于390 Hz,满足使用要求。
With the rapid development of relative technologies, the aero-cameras are developing in the direction of high resolution and large field of view. The existing CCDs cannot meet the requirement of large field of view. So, high-precision, multi-degree of freedom stitching technology has become an urgent demand for the current development. By comparing existing stitching technology, a multiple degrees of freedom mechanical interleaving stitching method which was different from traditional mechanical stitching and optical stitching methods were designed. The multiple degrees of freedom stitching machine with three points of cam was used to replace the traditional way of adjusting shims. So stitching can be adjusted in real time online. The analysis result shows that the method has a stitching error of less than 2 μm, a coplanar error of less than 5 μm. It can meet the imaging requirement of the camera. Modal simulation and modal experiment show that the resonant frequency of the structure of the first order is greater than 390 Hz, it can meet the requirements.
With the rapid development of relative technologies, the aero-cameras are developing in the direction of high resolution and large field of view. The existing CCDs cannot meet the requirement of large field of view. So, high-precision, multi-degree of freedom stitching technology has become an urgent demand for the current development. By comparing existing stitching technology, a multiple degrees of freedom mechanical interleaving stitching method which was different from traditional mechanical stitching and optical stitching methods were designed. The multiple degrees of freedom stitching machine with three points of cam was used to replace the traditional way of adjusting shims. So stitching can be adjusted in real time online. The analysis result shows that the method has a stitching error of less than 2 μm, a coplanar error of less than 5 μm. It can meet the imaging requirement of the camera. Modal simulation and modal experiment show that the resonant frequency of the structure of the first order is greater than 390 Hz, it can meet the requirements.
引文
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[6]Derek Edinger,Paul Mammini,Liz Osborne.Compact,lightweight,and athermalized mirror and ount for use on JWST′s NIRCam instrument[C]//SPIE,2005,5877:58770Q-1.
[7]Alison Nordt,Derek Edinger.Optical bench assembly for the near infrared camera[C]//SPIE,2005,5904:590406-1.
[8]Paul R Jorden,David G Morris,Peter J Pool.Technology of large focal planes of CCDs[C]//SPIE,2004,5167:72-82.
[2]Besuner Robert W,Bebek Christopher J,Haller Gunther M,et al.A 260 megapixel visible/NIR mixed technology focal plane for space[C]//SPIE,2011,8155:81550D-1.
[3]He Xin,Wei Zhonghui,Hao Zhihang.Digital stitching based on a single spherical system of nine plane array CCDs[J].Optics and Precision Engineering,2003,11(4):421-424.(in Chinese)何昕,魏仲慧,郝志航.基于单心球面系统的九块面阵CCD数字拼接[J].光学精密工程,2003,11(4):421-424.
[4]Shi Lei,Jin Guang,An Yuan,et al.Research on a mechanical interleaving stitching method of CCDs for remote sensing camera[J].Infrared,2009,30(1):12-15.(in Chinese)史磊,金光,安源,等.一种遥感相机的CCD交错拼接方法研究[J].红外,2009,30(1):12-15.
[5]San Bing,Wang Zhihong,Wang Shuxin,et al.Mechanical interleaving stitching method for multiple spectral CCDs camera[J].Journal of Changchun University of Technology(Natural Science Edition),2011,32(6):584-587.(in Chinese)伞兵,王志宏,王书新,等.多谱段相机面阵CCD交错拼接方法[J].长春工业大学学报(自然科学版),2011,32(6):584-587.
[6]Derek Edinger,Paul Mammini,Liz Osborne.Compact,lightweight,and athermalized mirror and ount for use on JWST′s NIRCam instrument[C]//SPIE,2005,5877:58770Q-1.
[7]Alison Nordt,Derek Edinger.Optical bench assembly for the near infrared camera[C]//SPIE,2005,5904:590406-1.
[8]Paul R Jorden,David G Morris,Peter J Pool.Technology of large focal planes of CCDs[C]//SPIE,2004,5167:72-82.