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Optical Engineering • Open Access

Aspherical surface profile fitting based on the relationship between polynomial and inner products

Paper Abstract

High-precision aspherical polynomial fitting is essential to image quality evaluation in optical design and optimization. However, conventional fitting methods cannot reach optimal fitting precision and may somehow induce numerical ill-conditioning, such as excessively high coefficients. For this reason, a projection from polynomial equations to vector space was here proposed such that polynomial solutions could be obtained based on matrix and vector operation, so avoiding the problem of excessive coefficients. The Newton–Raphson iteration method was used to search for optimal fitting of the spherical surface. The profile fitting test showed that the proposed approach was able to obtain results with high precision and small value, which solved the numerical ill-conditioning phenomenon effectively.

Paper Details

Date Published: 26 January 2016
PDF: 6 pages
Opt. Eng. 55(1) 015105 doi: 10.1117/1.OE.55.1.015105
Published in: Optical Engineering Volume 55, Issue 1
Show Author Affiliations
Xuemin Cheng, Graduate School at Shenzhen, Tsinghua Univ. (China)
Yikang Yang, Graduate School at Shenzhen, Tsinghua Univ. (China)
Qun Hao, Beijing Institute of Technology (China)

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