光学 精密工程, 2015, 23 (2): 402, 网络出版: 2015-03-23
X射线脉冲星导航探测器的微通道板甄选
Selection of MCP for array X-ray pulsar navigation detector
单光子探测 X射线探测器 脉冲星导航系统 微通道板(MCP) MCP甄选 脉冲幅值 计数率 single photon detection X-ray detector pulsar navigation system Microchannel Plate(MCP) MCP selection pulse amplitude count rate
摘要
根据应用于X射线脉冲星导航系统的大面阵X射线探测器对微通道板(MCP)性能的要求, 研究了甄选微通道板的方法。 确定了甄选微通道板的4个关键参量, 分别是增益的均匀性、阻抗匹配、暗计数率、增益系数。针对这4个参量设计了相应的测试实验, 制定了甄选MCP的流程, 并对采用该流程甄选出的MCP进行了幅值和计数率的测试。测试结果显示: 采用单通道阳极接收信号时, 每一个探测单元的幅值存在的相对误差各不相同, 第i个探测单元输出的信号幅值的最大相对误差Δ1i和最小相对误差Δ2i的波动分别为7%~13.5%, 3%~6.7%; 而采用四通道共享阳极时输出信号的Δ1i为7.8%、Δ2i为3.1%; 单通道阳极计数率之和(n=n1+n2+n3+n4)与四通道共享阳极计数率N的相对误差为4.38%, 小于预估值10%。上述实验结果表明该甄选方法能够甄选出满足探测器要求的MCP。
Abstract
According to the demands of an array detector in the X-ray pulsar navigation system for Micro-channel Plate(MCP), a selection method for the MCP was explored. Four key parameters for the selection of MCPs, the uniformity of gain, impedance matching, dark count rate and the gain coefficient were determined. Based on the four key parameters, corresponding experiments were designed and the selection process of MCPs was set out. The amplitudes and counting rates of MCPs selected by proposed method were tested. The tested results show that the relative error of each detection unit is not identical. When a single channel anode is used, the ranges of the maximum relative error Δ1i and minimum relative error Δ2i of the amplitudes for output signals from the ith anode are 7%-13.5% and 3%-6.7%, respectively, and when a four-channel anode is used, Δ1i and Δ2i are 7.8% and 3.1%, respectively. Moreover, the relative error between the anode count rate n1+n2+n3+n4 from the single channel and N from the four-channel shared anode is 4.38%, less than 10%. Obtained results indicate that the MCPs with good performance have been effectively chosen by the proposed selection method.
宋娟, 赵宝升, 盛立志, 刘哲, 刘永安. X射线脉冲星导航探测器的微通道板甄选[J]. 光学 精密工程, 2015, 23(2): 402. SONG Juan, ZHAO Bao-sheng, SHENG Li-zhi, LIU Zhe, LIU Yong-an. Selection of MCP for array X-ray pulsar navigation detector[J]. Optics and Precision Engineering, 2015, 23(2): 402.