光子计数法测量微光像增强器背景噪声分布特性  

Distribution characteristic measurement of LLL image intensifier background noise with photon counting method

作　　者：史继芳[1,2] 崔东旭[1] 贺英萍 解琪[1] 李宏光[1] 孙宇楠[1] 曹锋[1] 

机构地区：[1]西安应用光学研究所,陕西西安710065 [2]微光夜视技术重点实验室,陕西西安710065

出　　处：《应用光学》2013年第3期485-488,共4页Journal of Applied Optics

基　　金：微光夜视技术重点实验室基金自主项目(J20110509)

摘　　要：针对微光像增强器噪声特性,理论上分析了微光像增强器背景光子噪声特点。设计了采用光子计数法及使用类针孔微弱光照度计对微光像增强器的背景噪声进行测量的方案。在三代微光像增强器信噪比测量装置中,采用类针孔微弱光照度计对微光像增强器无光照时荧光屏上Ф0.2mm光斑的照度进行了测量实验。对于空间特性,以荧光屏中心点为圆心的同心圆上照度值不均匀性小于1%;对于时间特性,在微光像增强器工作大约270min后,荧光屏中心点照度值会达到稳定状态。以各个空间点和时间点照度值为基础分析了无光照时像增强器背景噪声在时间和空间的分布特性,为评价微光像增强器的噪声特性提供了数据支持。According to the noise characteristic of Low Light Level（LLL） image intensifier, the background noise characteristic of LLL image intensifier theoretically was analyzed. Then the photon counting method was designed, and LLL image intensifier background noise was meas- ured by quasi-point source low light illuminometer. On the signal-to-noise ratio measurement device of the third-generation LLL image intensifier, illuminance produced by 0. 2 mm point source on the fluorescent screen was measured using quasi-point source low light illuminometer with no input. For the spatial characteristics, the illuminance value inhomogeneity was less than 1% when the phosphor screen center point acted as the center of the concentric circles. But for the temporal characteristics,after the LLL image intensifiers worked 270 rain later, il- luminance values of phosphor screen center point could reach a steady state. Distribution char- acteristic of LLL image intensifier background noise based on the illuminance both in space points and time points was analyzed, and data proof for evaluating noise characteristic of LLL image intensifier was offered.

关 键 词：光子计数 类针孔光斑 微光像增强器 噪声特性 

分 类 号：TN144[电子电信—物理电子学]