| 基于离散小波包变换的规整化波前解卷积 |
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| 引用本文： | 田雨, 饶长辉, 张学军. 基于离散小波包变换的规整化波前解卷积[J]. 强激光与粒子束, 2008, 20(03). |
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| 作者姓名： | 田雨 饶长辉 张学军 |
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| 作者单位： | 1.中国科学院 光电技术研究所, 成都 61 0209;;;2.中国科学院 研究生院, 北京 1 00039 |
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| 摘 要： | 直接波前解卷积可以有效地克服大气湍流对天文观测的影响，但解卷积问题具有病态特性，必须进行规整化。基于奇异值分解的规整化方法在处理图像边缘等高频部分不够理想；而WVD方法仅适用某些解卷积问题。在提出一种基于小波包变换的新规整化方法的基础上，将此方法应用于室内模拟点源实验中，并与基于奇异值分解规整化的维纳逆滤波进行了对比,实验结果表明：该规整化方法可以有效地解决解卷积问题的病态特性，应用该规整化方法所恢复的图像质量明显提高。
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| 关 键 词： | 图像复原 解卷积 小波包 病态特性 规整化 |
Characteristics of X-ray photons in tilted incident laser-produced plasma |
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| wang rui-rong, chen wei-min, xie dong-zhu. Characteristics of X-ray photons in tilted incident laser-produced plasma[J]. High Power Laser and Particle Beams, 2008, 20. |
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| Authors: | wang rui-rong chen wei-min xie dong-zhu |
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| Affiliation: | 1. Key Laboratory of Optoelectronic Technology and System,Chongqing University,Chongqing 400044,China;;;2. State Key Laboratory of High Power Laser and Physics,Shanghai Institute of Laser Plasma,P.O.Box 800-229,Shanghai 201800,China |
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| Abstract: | Characteristics of X-ray and spout direction of heat plasma flow were studied on Shenguang-Ⅱ laser facility. Using of pinhole X-ray camera, X-ray photons from the plasma of aluminum (Al) irradiated by 1.053 μm laser, was measured and analysed. It is observed that the spatial distribution of X-ray photons in Al plasma for tilted irradiation is symmetic at the center of the target. The spout direction of heat plasma flow is inferred by the distribution contour of X-ray photons. The experimental results show that the spout direction of heat plasma flow is normal to target plane and the output intensity of X-ray photons does not increase significantly for tilted laser incidence. Uniformity of laser energy deposition is improved by superposing tilted incident and laser perpendicularly incide |
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| Keywords: | tilted irradiation plasma spout uniformity x-ray photons |
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