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28 November 2007 Method for calculating the center position of collimated laser beam spots
Guojun Wu, Lingling Wu, Yuping Cang, Liangyi Chen
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Proceedings Volume 6834, Optical Design and Testing III; 683421 (2007) https://doi.org/10.1117/12.755275
Event: Photonics Asia 2007, 2007, Beijing, China
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.
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Guojun Wu, Lingling Wu, Yuping Cang, and Liangyi Chen "Method for calculating the center position of collimated laser beam spots", Proc. SPIE 6834, Optical Design and Testing III, 683421 (28 November 2007); https://doi.org/10.1117/12.755275
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KEYWORDS
Diffraction
Image processing
Charge-coupled devices
Collimation
Image filtering
Binary data
Linear filtering
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