Stitching optimization for large-aperture aspheric surface and accuracy testing

Shiwei, 叶世蔚 Ye; Ping, 杨平 Yang; Zhengzhong, 王振忠 Wang; Yanting, 张艳婷 Zhang; Yunfeng, 彭云峰 Peng

doi:10.3788/hplpb20152706.64101

Cited by 2 publications

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“…Further, the acquired total angle(θ i,i-1 ) is substituted to derive the total translation(tx i,i-1 ) based on the data of overlap region. When the coordinate values of overlap region are processed into reference system, the values are equal [11].…”

Section: Multi-segments Stitching Algorithmmentioning

confidence: 99%

A Multi-Segments Stitching Method for Profile Measurement of Large Scale Aspheric Surface within Submicrometer Accuracy

Yang

Wang

et al. 2017

AMM

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A multi-segments stitching method is proposed to obtain two-dimensional profile of large scale aspheric components during grinding process. We firstly analyze the corresponding relation between surface features of aspherics and measurement range of profilometer. According to multi-body system theory and slope difference, a mathematical model of multi-segments stitching method is constructed. Further, the multi-segments stitching errors based on 400 mm aspheric profile are simulated with different translation amounts, rotation angles, translation errors as well as rotation errors. The simulation results indicate that the translation error is the key factor for measuring accuracy of the multi-segments stitching method. In addition, the standard deviations of multi-segments stitching errors are between 0.2 μm and 0.4 μm as the four factors are set to the proper values. To verify the simulation analysis results, an experimental setup, including Talysurf PGI 1240 and fixture, is applied to detect a 150 mm profile line on the aspheric surface. The experiment results show that the standard deviations of multi-segments stitching errors are almost within 1 μm when the rotation angle is under 7° and the translation amount is under 11 mm. The multi-segments stitching method can employ a small-range profilometer to achieve measurement of large scale aspheric surfaces with submicrometer accuracy.

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Section: Multi-segments Stitching Algorithmmentioning

confidence: 99%