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为了将来在宇宙空间对真空紫外波段辐射进行观测,现正在发展一种新的增强型的电荷耦合器件系统。该系统是专门为美国空间望远镜设计的数字摄象管,其中包括网支撑的CsI光电阴极和减薄的、反面照射的CCD。在这篇文章中,我们报告网支撑光电阴极近旁非均匀静电场对探测器系统成象特点(特别是扩散函数和调制传递函数)影响的计算机模拟结果。这些结果对管子前端结构及管子最佳工作条件的选择是有意义的。计算了管子的总分辨率特性,包括支撑网、管子电子光学以及CCD本身结构的影响。
In order to observe the radiation in the vacuum ultraviolet band in the space in the future, a new enhanced system of charge coupled devices is being developed. The system is a digital video tube designed specifically for the United States Space Telescope, which includes a mesh-supported CsI photocathode and a thinned, back-illuminated CCD. In this paper, we report the results of computer simulations of the effect of mesh-supported non-uniform electrostatic fields near the photocathode on the imaging characteristics of the detector system, in particular the diffusion and modulation transfer functions. These results make sense for the selection of the optimum working conditions for the pipe front structure and the pipe. The total resolution of the tube was calculated, including the effect of the support mesh, tube electron optics, and the structure of the CCD itself.