Int. J. of Nanomanufacturing   »   2013 Vol.9, No.2

 

 

Title: Computer-aided alignment in null testing of large aspheric mirrors

 

Authors: Yang Lin Peng; Yi Fan Dai; Xu Hui Xie; Shan Yong Chen; Gui Lin Wang

 

Addresses:
College of Mechatronics and Automation, National University of Defense Technology, Changsha, 410073, China
College of Mechatronics and Automation, National University of Defense Technology, Changsha, 410073, China
College of Mechatronics and Automation, National University of Defense Technology, Changsha, 410073, China
College of Mechatronics and Automation, National University of Defense Technology, Changsha, 410073, China
College of Mechatronics and Automation, National University of Defense Technology, Changsha, 410073, China

 

Abstract: During the null testing of aspheric mirrors, the error induced by misalignment of the null compensator or the mirror will couple with the surface figure and consequently give incorrect information for deterministic figuring. A mathematical alignment model of null testing is established, and the computer-aided alignment software is developed to determine the misalignment in this paper. Based on the analysis of aberration compensation with different alignment parameters, numerical simulations show that high accuracy alignment of null testing can be achieved by adjusting only five degrees of freedom of the null compensator, on condition that a planar interferometer is used and the amount of misalignment is small.

 

Keywords: large aspheric mirrors; null testing; computer-aided alignment; aberration compensation; null compensator misalignment; mathematical modelling; numerical simulation.

 

DOI: 10.1504/IJNM.2013.055147

 

Int. J. of Nanomanufacturing, 2013 Vol.9, No.2, pp.194 - 200

 

Submission date: 11 Sep 2012
Date of acceptance: 16 Jan 2013
Available online: 17 Jul 2013

 

 

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