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题名:
An improved schlieren method for measurement and automatic reconstruction of the far-field focal spot
作者: Wang, Zhengzhou1,2,3; Hu, Bingliang3; Yin, Qinye2
作者部门: 先进光学仪器研究室
刊名: PLOS ONE
出版日期: 2017-02-16
卷号: 12, 期号:2
DOI: 10.1371/journal.pone.0171415
文章类型: Article
英文摘要:

The schlieren method of measuring far-field focal spots offers many advantages at the Shenguang III laser facility such as low cost and automatic laser-path collimation. However, current methods of far-field focal spot measurement often suffer from low precision and efficiency when the final focal spot is merged manually, thereby reducing the accuracy of reconstruction. In this paper, we introduce an improved schlieren method to construct the high dynamic-range image of far-field focal spots and improve the reconstruction accuracy and efficiency. First, a detection method based on weak light beam sampling and magnification imaging was designed; images of the main and side lobes of the focused laser irradiance in the far field were obtained using two scientific CCD cameras. Second, using a self correlation template matching algorithm, a circle the same size as the schlieren ball was dug from the main lobe cutting image and used to change the relative region of the main lobe cutting image within a 100x100 pixel region. The position that had the largest correlation coefficient between the side lobe cutting image and the main lobe cutting image when a circle was dug was identified as the best matching point. Finally, the least squares method was used to fit the center of the side lobe schlieren small ball, and the error was less than 1 pixel. The experimental results show that this method enables the accurate, high-dynamic-range measurement of a far-field focal spot and automatic image reconstruction. Because the best matching point is obtained through image processing rather than traditional reconstruction methods based on manual splicing, this method is less sensitive to the efficiency of focal spot reconstruction and thus offers better experimental precision.

WOS标题词: Science & Technology
类目[WOS]: Multidisciplinary Sciences
研究领域[WOS]: Science & Technology - Other Topics
关键词[WOS]: NATIONAL IGNITION FACILITY
收录类别: SCI
项目资助者: National Natural Science Foundation of China(11327303 ; project titled "Research on underwater imaging technology based on compressive sensing via soft range gating and adaptive polarized light" ; 61405244)
语种: 英语
WOS记录号: WOS:000394424500028
ISSN号: 1932-6203
产权排序: 1
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.opt.ac.cn/handle/181661/28721
Appears in Collections:先进光学仪器研究室_期刊论文

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作者单位: 1.Xi An Jiao Tong Univ, Sch Elect & Informat Engn, Xian, Peoples R China
2.Univ Chinese Acad Sci, Beijing, Peoples R China
3.Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian, Peoples R China

Recommended Citation:
Wang, Zhengzhou,Hu, Bingliang,Yin, Qinye. An improved schlieren method for measurement and automatic reconstruction of the far-field focal spot[J]. PLOS ONE,2017,12(2).
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文件名: An improved schlieren method for measurement and automatic reconstruction of the far-field focal spot.pdf
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