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摄像管内信号电流I_s、电子束电流I_b、返回电子束电流I_r之间始终保持I_b=I_s+I_r的关系。本文从这一关系出发得出,为了消除图像中高亮度处的慧尾,控制电子束的办法有三种:信号电流(I_s)反馈控制电子束方式,返回电子束电流(I_r)反馈控制电子束方式和等效返回电子束电流(I_R)反馈控制电子束方式,并以2/3英寸、1英寸硒砷碲管的实际参数为基础,对其中最佳的第三种控制电子束方式的模型电路静态和暂态控制特性进行较详细的分析和实测,找出瞬间发生的电子束电流不足与控制特性的调整和图像慧尾改善度、图像信号波形的失真度之间对应关系,论述了最佳工作状态和控制特性的选定方法以及图像在不产生慧尾和模糊时,与正常信号电流的光圈比较,自动最佳电子束电路(ABO)的控制范围扩大4档以上,即进光量可扩大16倍以上。文中还指出只要在信号电流的输出端加入信号校正电路,则ABO电路也适用于二极管枪摄像管。
The relationship between I_b = I_s + I_r is always maintained between the camera signal current I_s, the electron beam current I_b and the returning electron beam current I_r. In this paper, we conclude from this relationship that there are three ways to control the electron beam in order to eliminate the high tail in the image: signal current (I_s) feedback control electron beam method, return electron beam current (I_r) feedback control electron beam method Based on the actual parameters of the 2/3 inch, 1 inch selenium arsenic and tellurium tubes, the best third electron beam mode control circuit Static and transient control characteristics of a more detailed analysis and measurement to find the instantaneous occurrence of electron beam current control and control characteristics of the tail and the improvement of the degree of distortion of the image signal waveform correspondence between the corresponding discussed the best Working conditions and control characteristics of the selected methods and images do not produce tail and blur, compared with the normal signal current aperture, automatic optimal beam control circuit (ABO) to expand the control range of more than 4 files, which can increase the amount of light into 16 times more. The article also pointed out that as long as the signal current output signal correction circuit added, the ABO circuit is also suitable for diode gun camera.