基于时间展宽技术, 设计研制了大面积阴极分幅变像管。 借助Matlab编程分别对单磁透镜和双磁透镜像管在离轴空间分辨率和像场畸变等方面特征作了数值模拟, 并采用阴极微带光刻分辨率板进行测试验证。 实验测试显示, 在缩小一倍成像下, 双透镜像管在离轴9 mm以内的空间分辨率优于5 lp/mm。 相比单透镜像管, 双透镜像管具有更高的空间分辨率, 更大的有效成像范围以及更小的成像畸变。 因而, 采用双透镜成像能够有效地提高像管的空间分辨能力, 可为分幅相机性能的进一步提升提供新的思路。

A large cathode framing tube was designed and developed based on the pulse-dilation technique. By virtue of Matlab programming, the spatial resolution of off-axis positions and the imaging distortion for magnetic double-lens and single-lens imaging were numerically simulated respectively. Resolution plates photoetched on the cathode micro-stripe were adopted to test the spatial performance of the tube. The experimental results show that at an imaging magnification of 2:1, the spatial resolution of the positions within 9 mm from the centre is higher than 5 lp/mm. Compared to magnetic single-lens imaging, the magnetic double-lens tube possesses a higher spatial resolution, a wider imaging range and a lower distortion, which provides a new way to improve the spatial resolving power of framing image converter tube.