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为了提高激光惯性约束聚变实验二维成像诊断的精密化程度, 提出了分幅变像管动态空间分辨率的标定方法. 标定原理是以直边函数为物, 经光学系统成像后求解系统的调制传递函数, 从而获得系统的空间分辨率. 在神光Ⅱ装置上利用八路激光打靶产生1-3.5 keV能区的连续X 射线标定源, 照射高Z刀边材料, 并成像到分幅变像管阴极上, 分幅变像管采用脉冲选通工作模式获得动态像. 对分幅变像管采集的动态图像进行处理得到系统的调制传递函数. 根据调制传递函数为0.1时对应的空间截止频率, 得到系统的空间分辨率为20 lp/mm. 根据分幅变像管的动态空间分辨理论, 计算系统的极限空间分辨率为22.8 lp/mm. 标定结果略低于极限空间分辨率, 与理论基本吻合. 根据传统标定方法得到该分幅变像管的静态空间分辨率为22 lp/mm, 比动态空间分辨率略高. 在二维成像诊断时, 分幅变像管工作于动态选通模式, 故动态空间分辨率的标定结果更能真实地反映其成像诊断能力.In order to improve the two-dimensional imaging diagnostic accuracy of inertial confinement fusion (ICF) experiment, a calibration method of the dynamic spatial resolution of X-ray framing image-converter (XFIC) is proposed. When an object with straight edge function is projected onto the photocathode of XFIC as an input, edge spread function can be obtained by recording an image of the XFIC output. The first derivative of the edge spread function produces the line spread function (LSF). Then the modulation transfer function (MTF) of the system can be worked out by Fourier transform of the LSF. Therefore, the spatial resolution can be deduced. According to this theory, the spatial resolution of XFIC can be obtained. Based on SG-Ⅱ laser facility, the calibrating X-ray source is generated by 8 bundled lasers bombarding the target. High-Z knife-edge is irradiated by the X-ray and imaged on the photocathode of XFIC, and then a dynamic image is obtained as the system works in the gating mode. By handling the dynamic image, the LSF of XFIC is given by analyzing the edge image. Then the MTF of the camera can be indicated by the Fourier transform of the LSF. When the MTF is 0.1, the corresponding spatial resolution of the imaging system is 20 lp/mm. According to the dynamic spatial resolution theory of framing image-converter, the extreme spatial resolution is 22.8 lp/mm. The calibration result agrees with the theoretical results. By contrast, the static spatial resolution of the same X-ray framing image-converter calibrated by the traditional method is presented here. The calibrated static spatial resolution is 22 lp/mm, a little higher than the dynamic one. During the two-dimensional imaging diagnosis, the X-ray framing image-converter works in the dynamic gating mode, thus the calibrated dynamic spatial resolution can be more truthful to reflect its imaging diagnosis ability.
[1] Nagel S R, Hilsabeck T J, Bell P M, Bradley D K, Ayers M J 2012 Rev. Sci. Instrum. 83 10E116
[2] Yi S Z, Mu B Z, Wang X, Zhu J T, Jiang L, Wang Z S, He P F 2014 Chin. Opt. Lett. 12 013401
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[18] Yuan Y T, Miao W Y, Ding Y K, Zhao Z Q, Hao Y D, Cao Z R 2009 High Power Laser and Particle Beams 21 245 (in Chinese) [袁永腾, 缪文勇, 丁永坤, 赵宗清, 郝轶聃, 曹柱荣2009强激光与粒子束 21 245]
[19] Zou Y S 1980 Vacuum Imaging Devices (Part One) (Beijing: Beijing Institute of Technology Press) pp46-71 (in Chinese) [邹异松 1980 真空成像器件(上册)(北京: 北京工业学院出版社) 第46-71页]
[20] Liu D S, Yin Z M, Zhu S L 1987 Fiber Optics (Beijing: Science Press) p77 (in Chinese) [刘德森, 殷宗敏, 祝颂来 1987 纤维光学 (北京: 科学出版社) 第77页]
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[1] Nagel S R, Hilsabeck T J, Bell P M, Bradley D K, Ayers M J 2012 Rev. Sci. Instrum. 83 10E116
[2] Yi S Z, Mu B Z, Wang X, Zhu J T, Jiang L, Wang Z S, He P F 2014 Chin. Opt. Lett. 12 013401
[3] Cao Z R, Miao W Y, Dong J J, Yuan Y T, Yang Z H, Yuan Z, Zhang H Y, Liu S Y, Jiang S E, Ding Y K 2012 Acta Phys. Sin. 61 075213 (in Chinese) [曹柱荣, 缪文勇, 董建军, 袁永腾, 杨正华, 袁铮, 张海鹰, 刘慎业, 江少恩, 丁永坤 2012 61 075213]
[4] Rochau G A, Wu M, Kruschwitz C, Joshen N, Moy K, Bailey J, Krane M, Thomas R, Nielsen D, Tibbitts A 2008 Rev. Sci. Instr. 79 10E912
[5] Zou F, Hou X, Yang W Z, Tian J S, Bai Y L, Liu B Y 2008 Acta Photon. Sin. 37 2369 (in Chinese) [邹峰, 侯洵, 杨文正, 田进寿, 白永林, 刘百玉 2008 光子学报 37 2369]
[6] Cai H Z, Liu J Y, Peng X, Niu L H, Peng W D, Long J H 2011 Proc. SPIE 8194 81941D
[7] Yang W Z, Tian J S, Hou X, Bai Y L, Bai X H, Liu B Y, Qin J J, Ouyang X 2007 Acta Photon. Sin. 36 2209 (in Chinese) [杨文正, 田进寿, 侯洵, 白永林, 白晓红, 刘百玉, 秦君军, 欧阳娴 2007 光子学报 36 2209]
[8] Cai H Z, Liu J Y, Peng X, Li W F, Ye Y P, Wu J F, Zhang T H, Deng Q J, Niu L H, Niu H B, Liu S Y, Yang G H 2012 Chinese J. Lasers 39 0117001 (in Chinese) [蔡厚智, 刘进元, 彭翔, 李文飞, 叶艳平, 吴剑锋, 张桃华, 邓祁军, 牛丽红, 牛憨犇, 刘慎业, 杨国洪 2012中国激光 39 0117001
[9] Liu Y A, Yan Q R, Sai X F, Wei Y L, Sheng L Z, Yang H, Hu H J, Zhao B S 2011 Chin. Phys. B 20 068503
[10] Yuan Z, Liu S Y, Cao Z R, Li Y F, Chen T, Li H, Zhang H Y, Chen M 2010 Chin. Phys. Sin. 59 4967 (in Chinese) [袁铮, 刘慎业, 曹柱荣, 李云峰, 陈韬, 黎航, 张海鹰, 陈铭 2010 59 4967]
[11] Zeng P, Yuan Z, Deng B, Yuan Y T, Li Z C, Liu S Y, Zhao Y D, Hong C H, Zheng L, Cui M Q 2012 Chin. Phys. Sin. 61 155209 (in Chinese) [曾鹏, 袁铮, 邓博, 袁永腾, 李志超, 刘慎业, 赵屹东, 洪才浩, 郑雷, 崔明启 2012 61 155209]
[12] Yuan Z, Liu S Y, Xiao S L, Cao Z R, Li H, Wang L W 2009 Acta Photon. Sin. 38 2495 (in Chinese) [袁铮, 刘慎业, 肖沙里, 曹柱荣, 黎航, 王丽伟 2009 光子学报 38 2495]
[13] Sheng L, Hei D W, Qiu M T, Wei F L, Wang P W, Wang K L 2008 Nucl. Electron. Detect. Technol. 28 274 (in Chinese) [盛亮, 黑东炜, 邱孟通, 魏福利, 王培伟, 王奎禄 2008 核电子学与探测技术 28 274]
[14] Matthew C T, George J Y, Paul Z 1995 Proc. SPIE 2551 181
[15] Zhu H Q, Wang K L, Xiang S M, Song G Z 2008 Rev. Sci. Instr. 79 023708
[16] Bakeman M S, Evans S C, Oertel J A, Walsh P J, Barnes C W 2004 Proc. SPIE 5194 205
[17] Kang H 1996 Imaging Optics (Tianjin: Publishing House of Nankai University) p308 (in Chinese) [康辉 1996 映像光学(天津: 南开大学出版社)第308页]
[18] Yuan Y T, Miao W Y, Ding Y K, Zhao Z Q, Hao Y D, Cao Z R 2009 High Power Laser and Particle Beams 21 245 (in Chinese) [袁永腾, 缪文勇, 丁永坤, 赵宗清, 郝轶聃, 曹柱荣2009强激光与粒子束 21 245]
[19] Zou Y S 1980 Vacuum Imaging Devices (Part One) (Beijing: Beijing Institute of Technology Press) pp46-71 (in Chinese) [邹异松 1980 真空成像器件(上册)(北京: 北京工业学院出版社) 第46-71页]
[20] Liu D S, Yin Z M, Zhu S L 1987 Fiber Optics (Beijing: Science Press) p77 (in Chinese) [刘德森, 殷宗敏, 祝颂来 1987 纤维光学 (北京: 科学出版社) 第77页]
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