防离子反馈微通道板的最佳工作电压试验研究  

Experimental investigations on best working voltage of MCP with ion barrier film

作　　者：张妮[1,2] 朱宇峰[1,2] 李丹[1,2] 张太民[1,2] 刘照路[1,2] 李相鑫[1,2] 郝子恒 陈畅[1,2] 

机构地区：[1]微光夜视技术重点实验室,陕西西安710065 [2]北方夜视科技集团有限公司,云南昆明650223

出　　处：《应用光学》2017年第3期480-484,共5页Journal of Applied Optics

摘　　要：带防离子反馈膜的微通道板(micro-channel plate,MCP)是负电子亲和势光电阴极微光像增强器的关键部件之一,其工作状态对负电子亲和势光电阴极微光像增强器的性能有严重影响,通过对无膜MCP及镀有不同厚度防离子反馈膜的MCP在不同阴极电压下、不同MCP电压下增益的测试与分析,最终确定出防离子反馈MCP的最佳工作电压:(1)对于负电子亲和势光电阴极像增强器用无膜MCP,其最佳工作电压为:当阴极电压大于一定值V_(c1)时,MCP增益几乎不变,说明此时的阴极电压V_(c1)为无膜MCP的最佳工作电压;当MCP电压为某一特定值V_(m1)(阴极电压为大于V_(c1)的任一值)值时,MCP出现增益,但增益值很低,当MCP电压大于(V_(m1)+100V)值时,MCP增益较大(大于20 000),可认为板压为(V_(m1)+100V)值为无膜MCP最佳工作板压;(2)对于同种材料的带膜MCP,其最佳工作电压为阴极电压Vc=无膜MCP的最佳阴极电压V_(c1)与防离子反馈膜的阈值电压的代数和,MCP电压为Vm>(V_(m1)+100V),具体值应根据防离子反馈MCP增益值的线性工作区来确定。该文的研究对防离子反馈MCP的最佳工作电压的确定及对负电子亲和势光电阴极像增强器性能的提高具有重要的意义。Micro-channel plate （MCP） with ion barrier film is one of the key components of Low Light Level（LLL）image intensifier with negative electron affinity, and working state of filmed MCP has a serious influence on it, so MCP best working voltage should be determined by testing filmed and unfilmed MCP gain in different voltage of MCP voltage and cathode voltage. ①For LLL image intensifier with negative electron affinity with unfilmed MCP, optimum operating voltage are： if cathode voltage exceeds a certain value Vc1 with MCP gain almost unchanged, this explains that cathode voltage Vc1 at this time is the best operating voltage; if MCP voltage is of a specific value Vm1 （cathod voltage is any value higher than Vc1） with low MCP gain, and MCP gain turns higher enough when〉20 000 MCP voltage becomes（Vm1＋100V）, thus this value （Vm1＋100V）is the optimum MCP voltage; ②For the same material with filmed MCP, operating voltage are： cathode voltage Vc=algebraic sum of unfilmed MCP cathode voltage （Vc1） and threshold voltage, and MCP voltage is Vm〉（Vm1＋100V）, whose specific value should be determined according to linear region of filmed MCP gain value. This study has an important significance to the determination of best working voltage and performance improvement of filmed MCP on NEA photocathode image intensifier.

关 键 词：最佳工作电压 防离子反馈MCP MCP电压 阴极电压 

分 类 号：TN223[电子电信—物理电子学]