中国物理B ›› 2009, Vol. 18 ›› Issue (1): 215-220.doi: 10.1088/1674-1056/18/1/035

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇    下一篇

Algorithm of far-field centre estimation based on phase-only matched filter

高妍琦, 朱宝强, 刘代中, 刘晓凤, 林尊琪   

  1. Laboratory of High Power Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Shanghai 201800, China
  • 收稿日期:2008-06-02 修回日期:2008-08-22 出版日期:2009-01-20 发布日期:2009-01-20
  • 基金资助:
    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.

Algorithm of far-field centre estimation based on phase-only matched filter

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)   

  1. Laboratory of High Power Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Shanghai 201800, China
  • Received:2008-06-02 Revised:2008-08-22 Online:2009-01-20 Published:2009-01-20
  • Supported by:
    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.

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摘要： 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.

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.

Key words: beam auto-alignment, far-field, image process, phase-only matched filter

中图分类号:  (Filters, zone plates, and polarizers)

  • 42.79.Ci
42.30.Kq (Fourier optics) 42.30.Va (Image forming and processing)