Shape measurement of aspheric plasti

Shape measurement of aspheric plastic lens with large angle

In this paper, according to the features of easy distortion and scratch for aspheric plastic lens, a noncontact measuring method is raised to test error in shape of the lens. Namely, the distance between a template and its image reflected with tested lens can be measured in nearly the vertical direction of the lens axis when the two-dimensional (2D) template is put near the measured surface. Then, the outline of the central cross-section could be obtained by calculating and curve fitting. Furthermore, three-dimensional (3D) surface can be imitated through rotating the component. A new fitting method of drift measurement is presented to prevent reducing precision when the lens and the template are fixed. The template is adjusted according to the position of the lens. The measurement precision is in the order of magnitued of sub-microns. Rotationally symmetric convex aspheric surface with any angle can be measured by this method.

作 者： Dagang Huang Heng Zhang Shah-Rong Lee Baoguang Wang   作者单位： Dagang Huang(State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072;College of Information Technique & Science, Nankai University, Tianjin 300071)

Heng Zhang(National Institute of Metrology,Beijing,100013)

Shah-Rong Lee(Kuang Wu Institute of Technology, Taipei)

Baoguang Wang(State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072) 

刊 名： 中国光学快报（英文版）  EI SCI 英文刊名： CHINESE OPTICS OF LETTERS  年，卷(期)： 2005 3(9)  分类号：   关键词：  

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