微通道板输入信号利用率提高研究

分析了微通道板输入信号损失的原因,提出了在微通道板输入端镀制绝缘层,从而提高微通道板输入信号利用率的方法,并进行了试验.试验结果表明:在微通道板输入端镀制一层15nm的绝缘层,可以提高微通道板输入信号的利用率,从而提高微通道板的增益.绝缘层的二次电子发射系数越高,微通道板输入信号的利用率越高,增益提高的比例越大.对SiO2膜层而言,可以提高12%左右;对Al2O3膜层而言,可以提高35%左右.在微通道板增益提高的同时,像增强器的分辨力和调制传递函数会降低,并且绝缘层的二次电子发射系数越高,分辨力和调制传递函数降低的比例越大.但微通道板分辨力和调制传递函数降低的比例远低于增益提高的比例.本文提出的提高微通道板输入信号利用率的方法具有一定的实用性,可以推广使用.

Study on the Improvement of Input Signal Utilization of MCP

In this paper,the reason of input signal loss caused by input electrode of Microchannel Plate(MCP)is analyzed,and a method of plating insulation layer on input end of MCP is proposed to increase the utilization of input signal of MCP which is verified by experiment.The experimental results show that a layer of 15 nm thick insulating layer is plated on the input end of the MCP,which can increase the utilization of the input signal of the MCP and the gain of the MCP.The higher the secondary electron emission coefficient of the insulating layer is,the higher the utilization ratio of the input signal of the MCP is,and the larger the ratio of the gain increase is.For SiO2 films,the gain can be increased by about12%.For Al2O3 films,the gain can be increased by about 35%.At the same time,the resolution and MTF of image intensifier will decrease slightly.Similarly,the higher the secondary electron emission coefficient is,the larger the decrease ratio of resolution and MTF is.However,the decrease ratio of resolution and MTF of MCP is much lower than that of gain increase.The method proposed in this paper to increase the utilization rate of input signal of MCP has certain practicability and can be popularized.