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19 May 2006 Research on technology of digital knife-edge test
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In order to measure the quantitative surface characteristics of large aperture optics conveniently, a digital knife-edge is formed based on the combination of traditional knife-edge, CCD image processing and computer aided calculation, which includes knife-edge positioning with image processing and introduces parameter PSD to describe frequency spectrum. Quantitative digital measurement of knife-edge is realized and surface characteristics of &nullset;150mm and &nullset;125mm spherical mirror is obtained with an accuracy up to 0.12λ(λ=532nm). In the meantime, the testing error, especially the tilt error is analyzed. Compared with testing results of interferometer, the digital knife-edge testing technology is verified available and the data useful for calculating geometric aberration and provides theoretical bases for surface modifying.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jun Zhang, Rong-zhu Zhang, Bang-wei Cai, and Panlong Liu "Research on technology of digital knife-edge test", Proc. SPIE 6150, 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 61500M (19 May 2006); doi: 10.1117/12.678088;

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