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

• Published in: Nuclear science and techniques Vol. 28; no. 7; pp. 79 - 84
• Main Authors: Liu, Jun, Yang, Jian, Zeng, Guo-Qiang, Zhang, Kai-Qi, Wei, Shi-Long, Ge, Liang-Quan
• Format: Journal Article
• Language: English
• Published: Singapore Springer Singapore 01-07-2017; Chengdu University of Technology, Chengdu 610059, China
• Subjects: Energy; Hadrons; Heavy Ions; Nuclear Energy; Nuclear Physics; 实时; 尖点; 整形技术; 现场可编程门阵列; 能量分辨率; 脉冲整形器; 谱仪; 递归差分方程; Spectrometry; FPGA; Pulse shaping; Digital signal processing; Cusp-like
• ISSN: 1001-8042; 2210-3147
• DOI: 10.1007/s41365-017-0248-1

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.