介质靶成象过程分辨率的研究

本文研究了在某些摄象器件、存贮器件或电光显示器件中介质靶诸因素对分辨率的影响。在考虑各向异性介质靶的普遍情况下,推导了由表面电荷光栅图象到电位图象或光象的介质靶的光学传递函数。定量地分析了它的分辨率极限;较详细地讨论了表面漏电和靶而其他介质膜层的引入对分辨率的影响。作为例子,利用TQ-16型计算机计算了摄象管中的硅靶、录象磁带中的聚苯乙烯靶和大屏幕投影电视中的DKDP晶体各向异性介质靶的MTF曲线,从而求得了它们的分辨率,所得结果与国外资料报道的实验曲线和数据很好地吻合。最后,用DKDP晶体所做的实验进一步证实了计算的结果。关键词：

STUDY OF THE RESOLUTION IN IMAGING PROCESS OF DIELECTRIC TARGETS

The influences of various factors of dielectric target in certain pick-up tubes, storage devices and electro-optic display devices on the resolution are studied in this paper. By considering the general case of anisotropic dielectric target, the optical transfer function (OTF) from surface charge raster pattern to potential or optical pattern of dielectric target is deduced. The resolution limit of the dielectric target is analyzed quantitatively. The leakage of electricity on surface and the influence of the other medium film layer introduced on target surface on the resolution are discussed in detail. For example, the MTF curves of silicon target in pick-up tubes, polystyrene target in video tape and anisotropic medium target of DKDP crystal in large screen projection TV are calculated by TQ-16 type computer, then the resolutions of these targets are found accordingly. The results obtained well coincide with the experimental curves and data in literatures. Finally, the calculation results are further confirmed by experiments on DKDP crvstal.