微通道板防离子反馈膜阈值电压特性研究

发布时间：2018-11-23 09:00

【摘要】：微通道板(Microchannel-plate,MCP)防离子反馈膜是负电子亲和势光电阴极微光像增强器的特有标志,其主要作用是有效阻止反馈正离子轰击阴极以提高器件工作寿命。微通道板防离子反馈膜的厚度决定了其对电子透过、离子阻挡能力的大小,电子透过能力直接影响图像的对比度和信噪比。根据微通道板防离子反馈膜阈值电压定义和测试原理,对微通道板不同厚度防离子反馈膜、不同工作电压条件下的阈值电压特性进行了测试研究。结果表明:防离子反馈膜的阈值电压随着膜层厚度的增加而增加,两者之间遵循正比的线性关系:Y=3.98 X+50;在微通道板线性工作电压范围内,防离子反馈膜的阈值电压随微通道板工作电压的增加而降低,两者之间遵循反比关系。该研究对提高微通道板在负电子亲和势光电阴极微光像增强器中的使用性能具有重要意义。
[Abstract]:Microchannel plate (Microchannel-plate,MCP) antiion feedback film is a special sign of negative electron affinity photocathode low light image intensifier. Its main function is to prevent feedback positive ion from bombarding the cathode to improve the working life of the device. The thickness of the antiion feedback film of the microchannel plate determines the electron transmission, the ion barrier ability and the electron transmission ability which directly affect the contrast and signal-to-noise ratio (SNR) of the image. According to the definition and testing principle of the threshold voltage of the microchannel plate antiion feedback membrane, the threshold voltage characteristics of the microchannel plate with different thickness and different working voltage are tested and studied. The results show that the threshold voltage of the anti-ion feedback membrane increases with the increase of the thickness of the film, and the linear relationship between the two is linear: YC 3.98 X 50; In the linear working voltage range of the microchannel plate, the threshold voltage of the anti-ion feedback membrane decreases with the increase of the working voltage of the microchannel plate, and the relationship between the two is inversely proportional. This study is of great significance to improve the performance of the microchannel plate in the negative electron affinity photocathode low light image intensifier.
【作者单位】：微光夜视技术重点实验室;北方夜视科技集团股份有限公司;
【基金】：国防预研基金
【分类号】：TN144

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