A laser sensor technique for measuring 3D surfaces based on the polarized heterodyne astigmatic principle

L. R. Qiu*, X. M. Ding

*此作品的通讯作者

科研成果: 期刊稿件文章同行评审

摘要

A laser measurement technique based on polarized heterodyne astigmatic principle is proposed for high precision three-dimensional (3D) profile measurement. In the presented system, the defocus astigmatic signal coming from the polarized reflection of the detected 3D surface is used to determine the position of the surface. The work of tracing, scanning and processing of the detected 3D surface is performed by combining the system with an ultra precision laser coordinate measuring machine (CMM). Compared with the current heterodyne astigmatic measuring technique, a polarization incidence and Glan-Thompson prism (GP) is used in the novel polarized heterodyne astigmatic measuring method. The anti-interference ability of the optical sensing system is significantly improved. The undesired influence on the measurement results, caused by fluctuation of surrounding brightness, by the intensity disturbance of the laser source, and by the multi-reflection among optical elements, is effectively restrained. Experimental results show that the stability of the optical sensing system is better than 2%. The resolution of the system is better than 0.005μm.

源语言英语
页(从-至)483-488
页数6
期刊Key Engineering Materials
295-296
DOI
出版状态已出版 - 2005
已对外发布

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