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核技术  2015 

碲锌镉探测器的数字核信号处理系统设计

DOI: 10.11889/j.0253-3219.2015.hjs.38.110401, PP. 110401-110401

Keywords: 碲锌镉探测器,电荷灵敏放大器,核信号处理系统,上升时间甄别,数字脉冲幅度分析器

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Abstract:

设计了完整的碲锌镉(CdZnTe,CZT)探测器数字核信号处理系统，包含了低功耗偏压电源、低噪声电荷灵敏放大器、数字梯形多道脉冲幅度分析器及数字上升时间甄别器。在考虑探测器与后端数字多道优化匹配前提下设计了低噪声电荷灵敏放大器；数字多道脉冲幅度分析器(DigitalMulti-ChannelPulseHeightAnalyzer,DMCA)通过高速模数转换器将模拟核信号离散化后，在现场可编程门阵列(FieldProgrammableGateArray,FPGA)中实现数字核脉冲信号处理；FPGA芯片中以快慢双通道梯形成形器为核心，针对碲锌镉探测器空穴收集不完全的问题，设计了数字上升时间甄别模块，有效消除了空穴拖尾效应，显著提升碲锌镉探测器的能量分辨率。从实验结果可知，针对西北工业大学提供的4mm×4mm×2mm的准半球结构碲锌镉探测器对241Am的分辨率最佳可达3.6%，对137Cs的分辨率可达0.96%。

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