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本文讨论硅增强靶摄象管的外动态范围。摄象机的自动光量控制系统可使光动态范围高达10~8∶1,从而实现全天候工作。为使该控制系统有效地发挥作用,要求SIT管在高压3～9kV范围内随控制系统变化时都能提供较好的分辨率,即较高的调制传递函数MTF、特别是在3kV时分辨率不致降得很低。为此,我们利用了“象管电子光学FOR TRAN通用程序”,在SIEMENS 7760计算机上对两种摄象管增强段的电子光学系统及其MTF进行了计算与分析,其结果与实际较为符合。计算与分析的具体内容有:两种管型在不同加速电压下的MTF曲线;400TVL的调制度随加速电压的变化;MTF随象面位置偏离的变化;在不同加速电压下的400TVL调制度随象面位置的变化;最佳工作点与最佳靶面位置的选择等,最后对动态范围的有关参量进行了初步探讨。
This article discusses the silicon’s enhanced dynamic range of the target tube. The camera’s automatic light control system allows the dynamic range of light up to 10 ~ 8: 1, in order to achieve all-weather work. In order to make the control system work effectively, it is required that the SIT tube can provide better resolution in the range of high voltage from 3 to 9 kV when the control system is changed, that is, the higher modulation transfer function MTF, especially at 3 kV resolution Not low down. To this end, we use the “electron tube electron optical FOR TRAN universal program” in the SIEMENS 7760 computer enhanced section of the two camera tube electronic optical system and MTF were calculated and analyzed, the results are more in line with the actual. The calculation and analysis are as follows: MTF curves of two types of tube at different accelerating voltages; the modulation of 400TVL with accelerating voltage; the variation of MTF with the deviation of image plane; the modulation of 400TVL with different accelerating voltages The change of the position of the image plane, the selection of the best working point and the optimal target position, etc. Finally, the relevant parameters of the dynamic range are discussed preliminarily.