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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。
Development of large-area cathode magnetic focus sub-variable tube. At 2: 1 electron optical magnification, the field curvature of single and double magnetic lens imaging was studied. 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 relationship between the optimal imaging position and the excitation variation of the off-axis point is deduced and a method of measuring and reducing the curvature of the image tube field is proposed The optimal imaging position of the off-axis points of the image tube was simulated by Matlab, and the imaging surface equation was fitted and tested by the proposed field curvature measurement method. The results show that computer simulation and experimental test results are close within a certain field of view. The best imaging planes under single and double magnetic lenses are all paraboloid of revolution, but the field curvature of the dual magnetic lens imaging is obviously improved than the single magnetic lens.