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›› 2010, Vol. 27 ›› Issue (4): 471-479.DOI: 10.7523/j.issn.2095-6134.2010.4.006

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Simulation study on measuring piston error of segmented mirror using dispersed fringe sensoring technology

ZHANG Yong, ZHANG Liang   

  1. National Astronomical Observatories / Nanjing Institute of Astronomical Optics & Technology, Chinese Academy of Sciences, Nanjing 210042, China; Key Laboratory of Astronomical Optics & Technology, Nanjing Institute of Astronomical Optics &Technology, Chinese Academy of Sciences, Nanjing 210042, China; Graduate University, Chinese Academy of Sciences, Beijing 100049, China
  • Received:2009-09-30 Revised:2010-03-12 Online:2010-07-15

Abstract:

When constructing the segmented primary mirror of a maximum aperture telescope, the piston error of segmented mirrors needs testing accurately. In this paper, a dispersed fringe sensor (DFS) was simulated from physical optics, according to the principle of dispersed fringe sensoring technology. DFS interferograms were produced and signals were sampled from them to obtain the result of detection through fitting curve of light distribution. We compared sampling signals in different wavebands and put forward two methods of sampling effective signals by opening window on a CCD camera to improve measuring precision. The measurement range is as large as ±50μm, and the measurement accuracy is about several tens of nanometers.

Key words: active optics, segmented mirrors, dispersed fringe sensor, piston error

CLC Number: