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菲利浦研究实验室已经为电子透镜的设计研究出了计算程序。几年来,马拉德公司(Mullard Mitcham)一直使用这些程序来设计新型的象增强器。使用结果证明:这种计算程序能精确地确定象管电子透镜的一些性质,比如象面位置、放大率等。在象增强器中电子透镜的一个非常重要的参数是焦深,焦深影响电子透镜元件公差的确定,也影响所允许的象场弯曲。然而焦深主要又取决于光电子能量的分布,于是需要寻求测量光电子能量分布的方法。使用具有聚焦电极的象增强器(型号为XX1332)可以直接测量焦深。其方法是测量调制传递函数和聚焦电压的比率变化。对不同波长的光,可以估算出相应的焦深,这样就能通过综合焦深的结果和光电阴极的光谱响应来计算光电子能量的分布,从而可以获得0.07eV的平均光电子能量。
Philips Research Laboratories has developed a computational program for the design of electron lenses. For years, Mullard Mitcham has been using these programs to design new image intensifiers. The results show that: This calculation program can accurately determine the tube electron lens of some properties, such as the image plane position, magnification and so on. A very important parameter of electron lenses in image intensifiers is the depth of focus, the determination of the depth of focus that affects the tolerances of the electronic lens elements, and also the allowed bending of the image field. However, the focal depth depends mainly on the distribution of the photoelectron energy, so the method of measuring the photoelectron energy distribution needs to be sought. Depth of focus can be measured directly using an image intensifier with focusing electrode (model XX1332). The method is to measure the ratio of the modulation transfer function to the focus voltage. For different wavelengths of light, the corresponding depth of focus can be estimated so that the distribution of the photoelectron energy can be calculated by combining the result of the depth of focus and the spectral response of the photocathode so that an average photoelectron energy of 0.07 eV can be obtained.