Nuclear Techniques ›› 2018, Vol. 41 ›› Issue (5): 50401-050401.doi: 10.11889/j.0253-3219.2018.hjs.41.050401

• NUCLEAR ELECTRONICS AND INSTRUMENTATION • Previous Articles     Next Articles

Design of digital multi-channel spectrometer based on auto-baseline restoration

CHEN Wei1,2, ZHOU Jianbin1, FANG Fang1, HONG Xu1, ZHAO Xiang1, ZHOU Wei1, MA Yingjie1   

  1. 1. College of Nuclear Technology and Automation Engineering, Chengdu University of Technology, Chengdu 610059, China;
    2. College of Information Engineering, Chengdu Aeronautic Polytechnic, Chengdu 610100, China
  • Received:2017-05-25 Revised:2017-08-10 Online:2018-05-10 Published:2018-05-08
  • Supported by:

    Supported by the National Key Research and Development Program of China (No.2016YFC1402505), National Natural Science Foundation of China (No.11475036, No.11675028)

Abstract:

[Background] The baseline drift of detector output could result in spectrum drift and energy resolution loss of the multi-channel spectrometer. Though baseline estimation approaches can obtain the baseline of nuclear signals, they are not able to reduce the effect of baseline drift on the front-end circuit. [Purpose] This study aims to design and implement a multi-channel spectrometer with auto-baseline restoration functionality. [Methods] First of all, the baseline of detector's output is estimated by using minimum average method and implemented in the field-programmable gate array (FPGA). Then the estimation value is sent to micro-controller unit (MCU) for regulation condition judgment, and to digital-to-analog converter (DAC) for necessary baseline adjustment. Finally, the baseline of detector output is restored in the front-end circuit. A multi-channel spectrometer is designed based on LaBr3(Ce) detector and this auto-baseline restoration functionality. [Results] The experimental results imply that the designed multi-channel spectrometer can realize baseline restoration automatically. [Conclusion] Under the situation of high radioactivity, the baseline drift of detector output can be solved by this multi-channel spectrometer, and the energy resolution of the system can remain stable.

Key words: Baseline restoration, Multi-channel spectrometer, Spectrum drift, Energy resolution

CLC Number: 

  • TL822+.4