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设计了一种大探测面积磁透镜分幅变像管。通过理论分析和模拟仿真的方法对单透镜和三透镜两种结构的分幅变像管在不同离轴位置的空间分辨率特性进行了研究,并通过实验进行验证。在仿真计算中,当成像缩小倍率为2…1时,单透镜结构仅能在10mm离轴半径内达到5lp/mm的空间分辨率,而三透镜结构能够在30mm离轴半径内达到5lp/mm的空间分辨率。在实验测试中,单透镜结构仅能在12mm离轴半径内达到5lp/mm的空间分辨率,而三透镜结构则能在27mm离轴半径内达到5lp/mm的空间分辨率。实验结果表明,采用三透镜结构设计的分幅变像管,其有效探测面积比单透镜结构大4倍以上。
Design a large detection area magnetic lens sub-variable image tube. Through the theoretical analysis and simulation, the spatial resolution characteristics of two kinds of single-lens and three-lens subscanned tubes in different off-axis positions are studied and verified by experiments. In the simulation calculations, the single-lens structure achieves only a spatial resolution of 5 lp / mm within an off-axis radius of 10 mm when the imaging reduction factor is 2 ... 1 while the three-lens structure achieves 5 lp / mm within a 30 mm off-axis radius The spatial resolution. In the experimental test, the single-lens structure achieves a spatial resolution of 5 lp / mm within a 12 mm off-axis radius, while the three-lens structure achieves a spatial resolution of 5 lp / mm within a 27 mm off-axis radius. Experimental results show that the use of three-lens design of variable-aspect tube, the effective detection area than the single lens structure more than 4 times larger.