摘要:
本文对Vidicon型摄象管中电子束着靶时的自变尖效应及其对电子束分辨能力的影响进行了计算机数值分析。所采用的数学物理模型为电子束中电流密度在横截面上的分布为Gauss分布;电子束中电子的能量分布为Maxwell分布;电子束读出靶面信息的模型为电容放电模型。在电子束截面为一维模型时,计算了1¼、1、2/3PbO管(plumbicon)1Sb2S3管和1硒砷碲管(saticon)中电子束自变尖的情况及其对电子束幅度响应函数(AR)的影响。分析了束电流、信号电流、束等效温度、靶面电容、扫描速度等因素在自变尖效应中所起的作用。本文还以1 ¼PbO靶管为例,给出了电子束截面为二维模型时,电子束有效着靶截面的自变尖情况。
Abstract:
In this paper the self-sharpening effect of electron beam landing on the target in a vidicon and its influence on resolution of electron beam have been digitally analyzed with computer. The mathematical-physical models applied are as follows: The distribution of current density in electron beam is Gaussian; the energy distribution of electrons in beam is Maxwellian; and the signal-readout model is capacitor discharge model. When the model of cross section of beam is one-dimensional, the self-sharpening effect of beam in 1¼ and 2/3plumbicon, 1 Sb2S3 vidicon and 1staticon are computed. Also their influences on AR (amplitude response) of electron beam have been computed. The influences of beam current, signal current, equivalent temperature of beam, target capacitor and velocity of scanning on the self-sharpening effect have been analyzed. when the model of cross section of beam is two-dimensional, the self-sharpening effect of beam in1¼plumbicon, as an example, is given.
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