Implementation of a cusp-like for real-time digital pulse shaper in nuclear spectrometry  

作　　者：Jun Liu Jian Yang Guo-Qiang Zeng Kai-Qi Zhang Shi-Long Wei Liang-Quan Ge 

机构地区：[1]Chengdu University of Technology, Chengdu 610059, China

出　　处：《Nuclear Science and Techniques》2017年第7期79-84,共6页核技术（英文）

基　　金：supported by the National Natural Science Foundation of China(Nos.41474159 and 41504139);Sichuan Youth Science and Technology Foundation(No.2015JQ0035);Sichuan Science and Technology Support Program(No.2017GZ0390);the Key Laboratory of Applied Nuclear Techniques in Geosciences Sichuan(No.gnzds2014006)

摘　　要：Pulse shaping,which improves signal-to-noise ratio excellently,has been extensively used in nuclear signal processing.This paper presents a cusp-like pulse-shaping technique developed through the recursive difference equation in time domain.It can be implemented in field programmable gate array hardware system.Another flat-topped cusp-like shaper is developed to optimize the time constant of pulse shaping and reduce the influence of ballistic deficit.The methods of both baseline restoration and pile-up rejection are described.The ^(137)Cs energy spectra measured with the digital cusp-like shaper are 6.6% energy resolution,while those by traditional analog pulse shaper are 7.2% energy resolution,under the same conditions.This technique offers flexibility,too,in adjusting the pulse shaper parameters.Pulse shaping,which improves signal-to-noise ratio excellently,has been extensively used in nuclear signal processing.This paper presents a cusp-like pulse-shaping technique developed through the recursive difference equation in time domain.It can be implemented in field programmable gate array hardware system.Another flat-topped cusp-like shaper is developed to optimize the time constant of pulse shaping and reduce the influence of ballistic deficit.The methods of both baseline restoration and pile-up rejection are described.The ^137Cs energy spectra measured with the digital cusp-like shaper are 6.6% energy resolution,while those by traditional analog pulse shaper are 7.2% energy resolution,under the same conditions.This technique offers flexibility,too,in adjusting the pulse shaper parameters.

关 键 词：脉冲整形器 现场可编程门阵列 能量分辨率 尖点 实时 谱仪 递归差分方程 整形技术 

分 类 号：TL822[核科学技术—核技术及应用]