3He管探测器前端处理电路设计与实现  

Design and implementation of the front-end circuit for 3He neutron detector

作　　者：王蕾[1,2] 张校尧 史涛 郑其斌 金钻明 WANG Lei;ZHANG Xiaoyao;SHI Tao;ZHENG Qibin;JIN Zuanming(Laboratory of Radiation Detection and Medical Imaging,University of Shanghai for Science and Technology,Shanghai 200093,China;Terahertz Technology Innovation Research Institute,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学辐射探测与医学成像实验室,上海200093 [2]上海理工大学太赫兹技术创新研究院,上海200093

出　　处：《电子元件与材料》2024年第9期1104-1112,共9页Electronic Components And Materials

基　　金：国家自然科学基金(12105177);国家重点研发计划(2023YFF0719202)。

摘　　要：面向3 He管中子探测器的测量需求,设计了一款前端处理电路,主要由信号成形模块和高压供电模块组成。信号成形模块采用分立元件方法,集成电荷灵敏放大、极零相消、多级滤波、基线恢复等功能电路,实现了信号的快速放大成形,可满足高计数率、微弱信号的测量需求;高压供电模块的核心器件选用国产高压元件,结合外控电压调节电路,为探测器提供合适的偏置高压,在0~2 kV范围内实现线性控制。测试表明,该前端电路输出信号的脉宽小于1μs,电荷测量的动态范围为-100~0 fC,等效输入噪声优于0.25 fC。A front-end circuit was designed to address the measurement requirements of 3 He neutron detector,which mainly consists of a signal shaping module and a high-voltage power supply module.The signal shaping module adopts the distributed elements method and integrates the charge-sensitive preamplifier,pole-zero cancellation,filter,baseline restorer,and other functions.As a result,the module can enable fast amplification and signal shaping,which can be adapted to high count rate testing.The high-voltage power supply module uses a domestic high-voltage component,and can be adjusted by external voltage control circuit,which can continuously and linearly provide voltage of 0-2 kV to the detector.The test results show that the pulse width of the output signal is less than 1μs,the front-end circuit has a charge range of-100-0 fC,and the measured equivalent input noise is below 0.25 fC.

关 键 词：前端电路 分立元件 整形滤波 高压器件 3 He管中子探测器 

分 类 号：TL82[核科学技术—核技术及应用]