摘要:
电视摄象管用于脉冲曝光时,会显出灵敏度下降和图象质量变坏。为了克服这些缺点,可以用在阴极上加适当的偏压脉冲,并延迟读出的方法。考虑到隔行扫描的电子束在靶面上部分地相互重叠所造成的靶面的复杂情况,可把靶面上的扫描光栅分为两部分,然后分别分析这两部分脉冲曝光后的讯号电流。 导出的公式可以计算讯号电流特性,这些公式在设计摄象机中的r校正器时是有用的。 为了表明阴极偏压的作用,计算了某些情况下的讯号电流特性。对于实际应用,加适当的阴极偏压是有实际意义的。最后,本文指出什么样的摄象管适用于脉冲摄象。
Abstract:
When T. V. pick-up tube is used under pulsed exposure, one will find the sensitivity of the tube descreases slightly and the quality of the picture degrades. These disadvantages can bo overcome by the use of delay readout and pulsing the cathode with suitable bias potentials.Eegarding to the complexity of the target surface due to partial overlapping of the electron scanning lines, we divide the scanning raster on the target into two parts, then analyse the signal current of these parts after pulsed exposure respectively. The obtained formulas can be used for calculating the signal current characteristics, some special case have been calculated, which give the useful informations for selecting the cathode bias potentials. Finally the paper shows how to select a T.V.pick-np tube for pulsed exposure application.
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