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Proceedings Paper

Research of measuring instrument with freeform surface
Author(s): Yuanyuan Wang; Jingchi Yu; Ying Ni; Jia Qu; Hao Chen
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Paper Abstract

In this paper, the principle, method and model of the instrument for measuring aspheric and freeform surface are described. This new type of profilometer which possesses differential measurement and polar-coordinate measurement functions is built on an ultra-precision air bearing stage. When using differential measurement, the radius of the best fit sphere of the tested aspheric surface is selected as reference to define the theoretical difference between the best fit sphere and the tested aspheric surface. After comparing the measurement results with the theoretical calculated results, we will obtain the surface error of the measured aspherical surface. With this method, the dynamic measurement range can be greatly reduced, which improves the measurement precision consequently. This surface profilometer can also be used to measure the surface of progressive addition lens (PAL). As an example, measurement of the freeform lens is given in this paper. The advantages of this device are easy for operation and highly précised.

Paper Details

Date Published: 20 May 2009
PDF: 6 pages
Proc. SPIE 7283, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 72834A (20 May 2009); doi: 10.1117/12.828820
Show Author Affiliations
Yuanyuan Wang, Wenzhou Medical College (China)
Ministry of Health (China)
Jingchi Yu, Wenzhou Medical College (China)
Soochow Univ. (China)
Ying Ni, Soochow Univ. (China)
Jia Qu, Wenzhou Medical College (China)
Ministry of Health (China)
Hao Chen, Wenzhou Medical College (China)
Ministry of Health (China)


Published in SPIE Proceedings Vol. 7283:
4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment
Yudong Zhang; James C. Wyant; Robert A. Smythe; Hexin Wang, Editor(s)

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