同位素2025，Vol.38Issue(3)：253-260,8.DOI:10.7538/tws.2025.youxian.005
裂变电离室脉冲前置放大器设计
Design of Fission Chamber Pulse Pre-amplifier
摘要
Abstract
Fission chambers are installed in the measurement channels within the reactor and the signals are transmitted via inorganic and organic cables.They can be used for monitoring the neutron flux of the reactor from startup to full power operation.Aiming at the measurement requirements of the output signal of the pulse ionization chamber,a fully differential pulse preamplifier for a fission chamber is designed.It mainly consists of two charge sensitive loops and a differential circuit stages.The charge sensitive loop uses a low noise field effect transistor as the input stage and a common base circuit as the secondary stage to achieve signal amplification.The differential circuit uses a high common-mode rejection ratio operational amplifier chip to overcome the interference and noise introduced by the front-end cable.The results show that when the fission chamber and preamplifier is connected by 10 m rigid cables and 30 m long flexible cables,the rise time of the output signal is less than 200 ns,the mean square value of noise is 13.3 mV,and the SNR is 30:1.The circuit performance basically meets the requirements of in-reactor neutron flux measurement.关键词
裂变电离室/前置放大器/差分电路Key words
fission chamber/preamplifier/differential circuit分类
核科学引用本文复制引用
黄鑫怡,杨昉东,刘洋,赵江滨,刘海峰,唐晨阳,孙佳宇,刘崭,何高魁..裂变电离室脉冲前置放大器设计[J].同位素,2025,38(3):253-260,8.基金项目
核能开发科研基金项目(72104) （72104）
