Volume 9 Issue 4
Jul.  2016
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MEI Gui, ZHAI Yan, MIAO Jian-yu, PU Qian-shuai, YU Da, ZHANG Bo-yan. Focal plane alignment and testing for an off-axis multispectral space borne camera[J]. Chinese Optics, 2016, 9(4): 491-500. doi: 10.3788/CO.20160904.0491
Citation: MEI Gui, ZHAI Yan, MIAO Jian-yu, PU Qian-shuai, YU Da, ZHANG Bo-yan. Focal plane alignment and testing for an off-axis multispectral space borne camera[J]. Chinese Optics, 2016, 9(4): 491-500. doi: 10.3788/CO.20160904.0491

Focal plane alignment and testing for an off-axis multispectral space borne camera

doi: 10.3788/CO.20160904.0491
Funds:

National Science Foundation of China No.61405191

Jilin Provincial Project of Science & Technology Development of China No.20150520102JH

More Information
  • Corresponding author: E-mail:meigui840428@163.com
  • Received Date: 16 Mar 2016
  • Rev Recd Date: 28 Apr 2016
  • Publish Date: 01 Aug 2016
  • To meet the requirements of high alignment accuracy for a multispectral camera, a focal plane subassembly is designed. Meanwhile, the instruments, fixtures and methods for alignment and measurement are described. First of all, the focal plane subassembly is mounted to the optics so that deflections and shifts of the CCD photosensitive area related to the image plane could be measured and calculated. According to the results given previously, the removal dimension of adjustment spacers is determined and preliminary modification is applied to the spacers. Thereafter, the focal plane subassembly is remounted. Then, the CCD is fine adjusted to its correct orientation and location, and locating pins are embedded into the spacers to hold this adjustment. Finally, based on the fitted optimum focal plane position, spacers are carefully ground and restored. Thus, the alignment is completed. Test results show that, three-dimensional deflections are Δα=-6.7", Δβ=1.9' and Δγ=13.2" respectively; three-dimensional shifts are Δx=-0.004 mm, Δy=0.006 mm and Δz=-0.070 mm respectively. The Modulation Transfer Functions(MTF) corresponding to four spectra and whole field of view are more than 0.25, which can meet the design and alignment specifications. The measurement and calculation error analysis shows that the equipments and methods can meet the precision requirements and provide technique references for homologous cameras.

     

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