磁聚焦变像管像场弯曲的改善研究

发布时间：2018-01-21 03:37

本文关键词： 超快光学变像管短磁聚焦空间性能像场弯曲　出处：《中国激光》2017年10期 　论文类型：期刊论文

【摘要】：研制大面积阴极磁聚焦分幅变像管。在2:1电子光学倍率下,研究单磁透镜和双磁透镜成像的像场弯曲。基于光学透镜成像原理,假设成像面形状不随激励微调而改变,推导了离轴点最佳成像位置与激励变化的近似关系式,并由此提出一种测量并减小像管像场弯曲的方法;借助Matlab编程模拟了像管各离轴点的最佳成像位置,拟合得到成像曲面方程,并利用所提出的像场弯曲测量方法进行了测试验证。结果表明,在一定视场范围内,计算机模拟与实验测试结果比较接近。单、双磁透镜下的最佳成像面均为旋转抛物面,但双磁透镜成像像场弯曲比单磁透镜有明显的改善。
[Abstract]:In this paper, a large area cathode magnetic focusing split-amplitude variable image tube is developed. The image field bending of single magnetic lens and double magnetic lens imaging is studied at 2: 1 electron optical ratio. The principle of optical lens imaging is based on the principle of optical lens imaging. Assuming that the shape of the imaging surface does not change with the excitation fine-tuning, the approximate relation between the optimum imaging position of off-axis point and the excitation change is derived, and a method to measure and reduce the bending of the image field of the image tube is proposed. The optimum imaging position of each off-axis point of the image tube is simulated by Matlab programming, and the imaging surface equation is obtained by fitting the imaging surface equation. The proposed image field bending measurement method is used to test and verify the results. In a certain range of field of view, the results of computer simulation and experiment are close. The optimal imaging surfaces under single and double magnetic lenses are all rotating paraboloid, but the bending of imaging image field of double magnetic lens is better than that of single magnetic lens.
【作者单位】：深圳大学光电子器件与系统教育部重点实验室;赣南师范大学物理与电子信息学院;
【基金】：国家自然科学基金(11305107) 深圳市科技计划(JCYJ20160608173121055,JCYJ20170302153912966)
【分类号】：TN143
【正文快照】： X射线分幅相机利用变像管来实现图像的光电转换、脉冲选通以及图像增强,是一种同时具有亚纳秒时间分辨和二维空间分辨能力的高灵敏度诊断设备。其借助光电阴极实现波长转换,响应波段覆盖紫外光到1004004-1X射线区,广泛应用于X射线激光、惯性约束核聚变(ICF)、Z-箍缩(Z-P)以及

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