Fast and precise center location for target of high power laser driver beam automatic alignment

Li Hong; Wang Dongfang; Lin Qiang; Jiang Zhuochai; Gao Yanqi; Liu Daizhong; Zhu Baoqiang

doi:10.3788/HPLPB20132509.2203

Volume 25 Issue 09

Jul. 2013

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Article Navigation > High Power Laser and Particle Beams > 2013 > 25(09): 2203-2207

Li Hong, Wang Dongfang, Lin Qiang, et al. Fast and precise center location for target of high power laser driver beam automatic alignment[J]. High Power Laser and Particle Beams, 2013, 25: 2203-2207. doi: 10.3788/HPLPB20132509.2203

Citation:

Li Hong, Wang Dongfang, Lin Qiang, et al. Fast and precise center location for target of high power laser driver beam automatic alignment[J]. High Power Laser and Particle Beams, 2013, 25: 2203-2207. doi: 10.3788/HPLPB20132509.2203

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Fast and precise center location for target of high power laser driver beam automatic alignment

doi: 10.3788/HPLPB20132509.2203

1.
Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;
2.
Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130021,China;
3.
Shanghai Institute of Laser Plasma,CAEP,Shanghai 201800,China

Received Date: 2013-04-03
Rev Recd Date: 2013-05-09
Publish Date: 2013-07-17

Abstract

Abstract

To meet the requirements for high accuracy and real time performance of high power laser driver beam automatic alignment, a fast and precise center location method for target of high power laser driver beam automatic alignment is proposed. The specific characteristics of the target edge are fully extracted by using multiple structuring elements-based generalized morphological edge detection, while the influences of the noises on images are diminished. Then, the edge is quickly located in sub-pixel precision by adopting the Lagrange polynomial interpolation method, at last the center position of the spot target in image is accurately acquired by using circle fitting method based on least square fitting method and geometric centroid. This algorithm is verified in the ShenguangⅡ upgrade device, the alignment time of eight prelight roads is less than 3 min, and the alignment time of the main light path is less than 7 min. The main output of the near-field beam collimation accuracy is better than 0.2%, and the far field accuracy is better than 0.2(RMS).
- automatic alignment,
- image processing,
- multiple structuring elements-based mathematical morphology,
- Lagrange polynomial interpolation

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