Nuclear Techniques ›› 2019, Vol. 42 ›› Issue (7): 0-070402-6.doi: 10.11889/j.0253-3219.2019.hjs.42.070402

• NUCLEAR ELECTRONICS AND INSTRUMENTATION •    

Digitalization of filter shaping circuit for nuclear pulse signal

Huaiqiang ZHANG1,2,Miaomiao YAN2,Jinyang LIU2   

  1. 1. Fundamental Science on Radioactive Geology and Exploration Technology Laboratory, East China University of Technology, Nanchang 330013, China
    2. School of Nuclear Science and Engineering, East China University of Technology, Nanchang 330013, China
  • Received:2019-02-23 Revised:2019-03-13 Online:2019-07-10 Published:2019-07-16
  • About author:ZHANG Huaiqiang, male, born in 1981, graduated from Chengdu University of Technology with a doctoral degree in 2011, focusing on nuclear detection technology and nuclear instruments
  • Supported by:
    Supported by National Natural Science Foundation of China (No.11665001, No.41864007), National Key R & D Project (No.2017YFF0106503), China Scholarship Council (No.201708360170), One Hundred People Sail in Jiangxi Province, Open-ended Foundation from the Fundamental Science on Radioactive Geology and Exploration Technology Laboratory(No.RGET1309)

Abstract: Background

Filter shaping of pulsed signals is used to change the pulse shape and increase the system signal-to-noise ratio for better performance in a nuclear spectrometer system.

Purpose

This study aims at digitalization of filter shaping circuit for nuclear pulse signal.

Methods

Based on the principle of digital pole-zero cancellation and digital Sallen-Key in the time domain, the shape recursive function was derived, and the transfer function of them in the Z domain was obtained respectively. The filtering performance and amplitude-frequency response characteristics in the frequency domain were analyzed. Then the digital pole-zero cancellation and digital Gaussian shaping recursive function model are used to realize the simulated nuclear pulse signal processing with different parameters. Furthermore, 55Fe and 137Cs radioactive sources were measured with the Si-PIN detector and NaI detector respectively, obtained nuclear pulse signals were processed by the digital pole-zero cancellation and digital Gaussian shaping processing with different parameters.

Results and Conclusion

The results in both the time domain and the frequency domain show the efficiency of proposed digitalization approaches of filter shaping circuit for nuclear pulse signal. These approaches can be applied to the optimization of the pole-zero cancellation and filter shaping parameters of nuclear pulse signals.

Key words: Nuclear pulse signal, Digital Sallen-Key, Digital pole-zero cancellation, Frequency response

CLC Number: 

  • TL817