Abstract Estimation of the far-field centre is carried out in beam auto-alignment. In this paper, the features of the far-field of a square beam are presented. Based on these features, a phase-only matched filter is designed, and the algorithm of centre estimation is developed. Using the simulated images with different kinds of noise and the 40 test images that are taken in sequence, the accuracy of this algorithm is estimated. Results show that the error is no more than one pixel for simulated noise images with a 99% probability, and the stability is restricted within one pixel for test images. Using the improved algorithm, the consumed time is reduced to 0.049s.
Received: 02 June 2008
Revised: 22 August 2008
Accepted manuscript online:
Fund: Project supported by the National
High Technology Research and Development Program of China (Grant No
007SQ804) and Japan--Korea--China Cooperative Project on High
Energy Density Science for Laser Fusion Energy.
Cite this article:
Gao Yan-Qi(高妍琦), Zhu Bao-Qiang(朱宝强), Liu Dai-Zhong(刘代中), Liu Xiao-Feng(刘晓凤), and Lin Zun-Qi(林尊琪) Algorithm of far-field centre estimation based on phase-only matched filter 2009 Chin. Phys. B 18 215
Study of superstructure II in multiferroic BiMnO3 Ge Bing-Hui(葛炳辉), Li Fang-Hua(李方华), Li Xue-Ming(李雪明), Wang Yu-Mei (王玉梅), Chi Zhen-Hua (迟振华), and Jin Chang-Qing (靳常青). Chin. Phys. B, 2008, 17(9): 3163-3169.
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