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为了探讨三代微光像增强器的合适工作电压,研究了前近贴脉冲电压对微光像增强器halo效应的影响.将脉冲电压信号加在光电阴极上,分别改变脉冲信号的高低电平电压幅值和占空比,利用高分辨率CCD采集了微光像增强器的halo图像,对比分析了halo图像中心线上各像素点对应的灰度值分布和光子计数.研究结果表明,随着高电平电压幅值和占空比的提高,灰度值为255的像素点数目变多,halo图像中背景和信号的边界越来越清晰.当前近贴电压增加到200V以上和占空比大于60%左右时,其对三代微光像增强器halo图像中心线上各像素点的灰度值分布影响不大.当低电平电压增加到2V以上时,光电子在低电平阶段无法克服阻滞场到达微通道板.此研究有利于探讨微光像增强器的最佳工作电压和光电子从阴极面出射时的能量分布,为提高三代微光像增强器的性能提供了实验支撑.
In order to investigate the suitable operating voltage of the three-stage micro-image intensifier, the influence of the pulse voltage on the halo effect of the micro-image intensifier was studied. The pulse voltage signal was applied to the photocathode to change the voltage level of the pulse signal The amplitude and the duty ratio of the halo image were acquired by using a high resolution CCD and the gray value distribution and photon counting corresponding to each pixel on the center line of the halo image were compared and analyzed.The results show that with the High voltage amplitude and duty cycle increased, the number of gray-scale value of 255 pixels increased, halo image background and signal boundaries become clearer.Now the current patch voltage increased to more than 200V and duty cycle Is greater than 60%, it has little effect on the gray value distribution of each pixel on the central line of halo image of three generations of micro-image intensifier.When the low level voltage is increased above 2V, the photoelectrons can not be overcome in the low level And the stagnation field reaches the microchannel plate.This study is conducive to discuss the best working voltage and energy distribution when the photoelectron exits from the cathode plane, which provides an experimental support for improving the performance of the third-generation light intensifier.