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Proceedings Paper

Method for calculating the center position of collimated laser beam spots
Author(s): Guojun Wu; Lingling Wu; Yuping Cang; Liangyi Chen
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Paper Abstract

It is a key problem of measuring warp making use of collimated laser how to accurately calculate laser beam's center. A new method, named double geometrical center method, is put forward. In this method, plane wave perpendicularly irradiates an aperture stop, and a charge couple device (CCD) is employed to receive diffraction-beam spots, then the geometrical centers of the first and second diffraction-beam spots are working-out respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as intensity fluctuations of the laser beam spots, part of the image being saturated, this method can still work well. What's more, this method can detect whether an unacceptable error is exits in the courses of image receiving, processing and calculating. Experimental results indicate this method can remarkably improve the measurement accuracy.

Paper Details

Date Published: 28 November 2007
PDF: 5 pages
Proc. SPIE 6834, Optical Design and Testing III, 683421 (28 November 2007); doi: 10.1117/12.755275
Show Author Affiliations
Guojun Wu, Xi'an Institute of Optics and Precision Mechanics (China)
Graduate School of the Chinese Academy of Sciences (China)
Lingling Wu, Xi'an Institute of Optics and Precision Mechanics (China)
Graduate School of the Chinese Academy of Sciences (China)
Yuping Cang, Xi'an Institute of Optics and Precision Mechanics (China)
Graduate School of the Chinese Academy of Sciences (China)
Liangyi Chen, Xi'an Institute of Optics and Precision Mechanics (China)


Published in SPIE Proceedings Vol. 6834:
Optical Design and Testing III
Yongtian Wang; Theo T. Tschudi; Jannick P. Rolland; Kimio Tatsuno, Editor(s)

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