摘要
鉴于离子阻挡膜保证了三代像增强器的工作寿命,但增加了微通道板和三代像增强器的噪声因子,降低了三代像增强器的信噪比,削弱了NEA光阴极的优势,提出一种最新研制的微通道板。它优化了玻璃成份,提高了玻璃的工作温度,同时还改善了通道内壁工作面结构,且开口面积比达到65%-70%。通过三代像增强器制管试验证实,这种高性能微通道板具有低噪声因子特性,与标准M CP相比,可显著提高三代管的信噪比。最后指出通过进一步试验和改进,实现更高信噪比长寿命无膜三代像增强器的可能性。
A new technique of MCP fabrication is proposed for overcoming the disadvantages of noise factor increase, signal-to-noise ratio decrease and NEA photocathode superiority reduction caused by the ion barrier film coated on MCP during the operation lifetime of image intensifier. With the technique, the glass composition is optimized, the operation temperature of the synthetic glass is increased, the inwall structure of the channel is improved, and the open aperture ratio reaches 65%-70%. The experiment results show that the high performance MCP can improve the secondary emission performance while the ion feedback noise is reduced. This MCP can offer an even lower noise figure performance in comparison with the standard MCP, and significantly improve the signal-to-noise ratio of Gen. Ⅲ image intensifiers. Finally, it is pointed out that the further work on the MCP will make high signal-to-noise ratio and long operation life filmless Gen. Ⅲ image intensifier possible.
出处
《应用光学》
CAS
CSCD
2007年第3期301-304,320,共5页
Journal of Applied Optics
关键词
像增强器
微通道板
信噪比
噪声因子
高性能微通道板
image intensifier
microchannel plate
signal-to-noise ratio
noise figure
high performance MCP
