一种中子探测器放大电路的设计与实现  

Design and Implementation of a Neutron Detector Amplifier Circuit

作　　者：郭思明[1] 王攀峰[1] 李冠稼 王庆斌[1] 张清江[1] 

机构地区：[1]中国科学院高能物理研究所,北京100049

出　　处：《核电子学与探测技术》2014年第9期1041-1044,1050,共5页Nuclear Electronics & Detection Technology

基　　金：国家重大科学仪器设备开发专项(Y11Z6630BZ)资助

摘　　要：介绍了一种可用于中子探测器的放大电路的设计与实验验证。该电路由前置放大器、主放大器、脉冲幅度甄别器和触发器四部分组成。该电路采集正比计数管产生的微弱信号,由两级放大器对初始信号进行放大,并由脉冲幅度甄别器进行甄别成形,触发器形成固定宽度的方波脉冲供后续单片机系统采集计数。整机探测器在天然本底、252Cf中子源及模拟信号发生器下分别进行实验测试,实验结果证明了该放大电路的可靠性以及在中子探测器中的可用性。This paper introduces the design and experimental validation of an amplification circuit which could amplify the signal generated by neutron proportional counter tube .The circuit consists of preamplifier electron-ics,main amplifier,pulse amplitude discriminator and flip -flops.The circuit can collect the signal which is generated by gas proportional counter tube .Then it improves the signal to noise ratio , and further magnifying the signal .Finally it shapes the pulse amplitude through the integrated voltage comparator and triggers the for -mation of a fixed-width square wave pulse for subsequent collection SCM system .The detector was tested in natural background , under the 252 Cf neutron source or with the analog signal generator , these experimental re-sults prove the reliability and availability of the amplifier circuit of the neutron detector .

关 键 词：中子探测器 前置放大器 主放大器 脉冲幅度甄别器 

分 类 号：TL821[核科学技术—核技术及应用]