Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2017, Vol. 28 ›› Issue (7): 103 doi: 10.1007/s41365-017-0248-1

• NUCLEAR ELECTRONICS AND INSTRUMENTATION • Previous Articles     Next Articles

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

Jun Liu, Jian Yang, Guo-Qiang Zeng, Kai-Qi Zhang, Shi-Long Wei, Liang-Quan Ge*   

  1. Chengdu University of Technology, Chengdu 610059, China
  • Supported by:

    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) and the Key Laboratory of Applied Nuclear Techniques in Geosciences Sichuan (No. gnzds2014006).

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Jun Liu, Jian Yang, Guo-Qiang Zeng, Kai-Qi Zhang, Shi-Long Wei, Liang-Quan Ge. Implementation of a cusp-like for real-time digital pulse shaper in nuclear spectrometry.Nuclear Science and Techniques, 2017, 28(7): 103     doi: 10.1007/s41365-017-0248-1
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Abstract:

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.

Key words: Cusp-like, Pulse shaping, Digital signal processing, FPGA, Spectrometry