摘要
MCP是一种超快响应的电子倍增器,在像增强器和光电倍增管中有广泛应用。本文首先介绍了MCP输入增强膜原理,之后利用真空镀膜方法在MCP的输入端镀制了一层具有高二次电子发射系数的膜层,并通过面电阻、XPS表征了膜层特性。通过试验,对比测量了镀膜MCP和常规MCP像增强器的信噪比、MCP增益以及像增强器分辨力,测量结果表明,镀膜MCP像增强器的信噪比、MCP增益较常规MCP像增强器的信噪比、MCP增益均有提高,但像增强器分辨力有所下降。常规MCP像增强器的信噪比平均为25.27、MCP增益平均为209.5、像增强器分辨力平均为61 lp/mm,而镀膜MCP像增强器的信噪比平均为29.53、MCP增益平均为450.5、像增强器分辨力平均为54.75 lp/mm。镀膜MCP像增强器信噪比和MCP增益提高的原因是MCP输入端镀膜以后,表面二次电子发射系数提高。另外由于MCP输入端表面二次电子发射系数提高,导致镀膜MCP输入端表面散射电子数量的增加,使得镀膜MCP像增强器分辨力有所下降。
A microchannel plate(MCP)is a superfast response electron multiplier that is widely used in image intensifiers and photomultipliers.Herein,first,the principle of MCP input enhancement film is introduced;subsequently,a film with a high secondary electron emission coefficient is deposited on the input end of the MCP via vacuum coating,and the characteristics of the film are characterized by surface resistance and X-ray photoelectron spectroscopy(XPS).Through experiments,the signal-to-noise ratio,MCP gain,and image intensifier resolution of the coated MCP and conventional MCP image intensifier are measured.The results show that the signal-to-noise ratio of the image intensifier and the MCP gain of the coated MCP are higher than those of the conventional MCP;however,the resolution of the image intensifier is lower.For the conventional and coated MCP image intensifiers,the signal-to-noise ratios are 25.27 and 29.53,respectively;the average MCP gains are 209.5 and 450.5,respectively;the average resolutions of the image intensifier are 61 and 54.75 lp/mm,respectively.The increase in the signal-to-noise ratio of the image intensifier and MCP gain are due to the increase in the surface secondary electron emission coefficient after the MCP input is coated.In addition,owing to the increase in the secondary electron emission coefficient of the MCP input surface,the number of scattered electrons on the MCP input surface increases,thereby decreasing the resolution of the MCP image intensifier.
作者
曾进能
李廷涛
常乐
龚燕妮
赵伟林
赵恒
张俊
褚祝军
李顺平
李晓峰
ZENG Jinneng;LI Tingtao;CHANG Le;GONG Yanni;ZHAO Weilin;ZHAO Heng;ZHANG Jun;CHU Zhujun;LI Shunping;LI Xiaofeng(North Night Vision Technology Co.Ltd,Kunming 650217,China;Science and Technology on Low-light-level Night Vision Laboratory,Xi’an 710065,China)
出处
《红外技术》
CSCD
北大核心
2020年第8期735-741,共7页
Infrared Technology
基金
国家自然科学基金(11535014)。
关键词
像增强器
微通道板
分辨力
信噪比
MCP增益
二次电子
image intensifier
MCP
resolution
signal to noise ratio
MCP electronic gain
secondary electron
