大面积SiPM阵列混合模式读出电子学设计  

Design of Mixed-mode Readout Electronics for Large-area SiPM Arrays

作　　者：何雷 赵修良[1] 黄跃峰[2] 侯会良 安焜豪 HE Lei;ZHAO Xiuliang;HUANG Yuefeng;HOU Huiliang;AN Kunhao(School of Nuclear Science and Technology,University of South China,Hengyang 421001,China;Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]南华大学核科学技术学院,湖南衡阳421001 [2]中国科学院上海应用物理研究所,上海201800 [3]中国科学院大学,北京100049

出　　处：《原子能科学技术》2025年第1期189-196,共8页Atomic Energy Science and Technology

基　　金：国家自然科学基金(12075308)。

摘　　要：放射性物质的准确定位对于寻找“孤儿源”、核设施去污和退役、辐射防护最优化等至关重要。硅光电倍增管(silicon photomultiplier,Si PM)已广泛应用于闪烁体探测系统。为实现低成本大视野高分辨探测系统,通过测量ASIC(application specific integrated circuit)芯片对输入信号的要求,仿真了电阻阻值与电阻网络输出信号上升时间之间的关系,设计了前置放大器用于适配ASIC芯片和电阻网络,利用电阻网络的信号通道压缩特性和ASIC芯片多路复用、高度集成等优点,设计验证了将两者优势相结合的混合模式读出电路。测试结果显示:读出电路RMS噪声约为2.73 m V,能准确测出^(241)Am点源的位置,定位正确率约90.87%。设计的混合模式读出电路将64路Si PM信号简化为4路,探测器输出信号通道数减少16倍,单个A5202模块能同时读出1024个Si PM单元,能极大降低大面积Si PM阵列读出的成本。Accurate localization of radioactive material is essential for finding“orphan sources”,decontaminating and decommissioning nuclear facilities,and optimizing radiation protection.Silicon photomultiplier(Si PM)has been widely used in scintillator detection systems.To realize a low-cost large-field-of-view high-resolution detection system,a mixed-mode readout circuit combining a resistive network,a preamplifier circuit and an ASIC module was designed and verified.Firstly,by changing the rising edge,falling edge,pulse width and amplitude of the input pulse,the requirements of the A5202 module on the input pulse were experimentally measured to achieve the best data acquisition performance.When the rise time of the input pulse is less than 150 ns and the amplitude is greater than20 m V,the data measured by the A5202 module have less noise and higher energy resolution.Then simulation was carried out by Multisim software.This simulation analyzed in detail the relationship between the resistor resistance and the rise time of the output signal.It determines the optimum resistor resistance value for the symmetric charged division circuit.The rise time of the output signal is relatively minimized when the resistance value of the first stage shunt resistor is 1 kΩand the resistance value of the second stage shunt resistor is 100Ω.Finally,in order to simultaneously take into account the characteristics of the output signal of the symmetric charged division circuit and the requirements of the A5202 module for the input signal,an inverse proportional operational amplifier circuit with the AD8066ARZ chip as the core was designed.It is used to connect the A5202 module and the symmetric charged division circuit.After the scintillator detection system was assembled,the stability of the system was examined,then the RMS noise of the system was measured,and finally the positioning accuracy of the system was examined.In order to improve the robustness of localization,the localization threshold was first calibrated with single lute

关 键 词：硅光电倍增管 均衡电荷分配读出方法 ASIC芯片 

分 类 号：TL99[核科学技术—核技术及应用]