標題: Collimation testing and calibration using a heterodyne Moire method
作者: Chang, Wei-Yao
Hsu, Ken Y.
Chen, Kun-Huang
Chen, Jing-Heng
光電工程學系
Department of Photonics
關鍵字: Collimation testing;Moire interferometry;Talbot effect;Heterodyne interferometry
公開日期: 1-Nov-2014
摘要: This study proposes a simple, rapid, and highly accurate method to achieve the collimation testing and calibration of laser light beams. By applying a relative constant velocity to two gratings, every pixel of a CMOS camera can receive a series of heterodyne moire signals. Based on the least squares sine fitting algorithm, the phase of the optimized sinusoidal wave can be obtained. Consequently, the phase slope along the direction perpendicular to the grating lines can be estimated and then used to judge the degree of collimation. Furthermore, by measuring only two phase slopes at two positions of the collimating lens, the calibration of the light beam collimation can also be achieved. The experiment validated the proposed method, and the positioning error of the light beam collimation was approximately 7 mu m. (C) 2014 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.optlaseng.2014.06.001
http://hdl.handle.net/11536/24799
ISSN: 0143-8166
DOI: 10.1016/j.optlaseng.2014.06.001
期刊: OPTICS AND LASERS IN ENGINEERING
Volume: 62
Issue: 
起始頁: 126
結束頁: 131
Appears in Collections:Articles


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