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采用双磁透镜设计时间展宽分幅变像管,对其空间分辨特性进行模拟和测试。采用2#分辨率板测试像管空间分辨率,以及大面积阴极测试像管在离轴位置的空间分辨能力。测试结果表明,双磁透镜像管的空间分辨率为74 mm;在图像缩小1倍时,能有效分辨阴极距离中心轴位置30 mm的信息。像管的空间分辨率和在阴极离轴位置的分辨能力都优于单磁透镜像管。因此,双磁透镜能有效提高时间展宽分幅变像管的空间分辨特性。
The double magnetic lens is used to design the time broadening sub-variable image tube, and the spatial resolution characteristics are simulated and tested. The 2 # resolution board is used to test the spatial resolution of the image tube and the spatial resolution of a large area cathode tube in the off-axis position. The test results show that the spatial resolution of the dual magnetic lens tube is 74 mm. When the image is reduced by one time, the cathode can be effectively separated from the central axis by 30 mm. The spatial resolution of the image tube and the resolving power in the off-axis position of the cathode are better than those of the single magnetic lens tube. Therefore, the bi-magnetic lens can effectively improve the spatial resolution of the time-broadening tube.