基于基线自动恢复技术的数字多道能谱仪

doi:10.11889/j.0253-3219.2018.hjs.41.050401

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 Wei^1,2, ZHOU Jianbin¹, FANG Fang¹, HONG Xu¹, ZHAO Xiang¹, ZHOU Wei¹, MA Yingjie¹

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

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

CHEN Wei, ZHOU Jianbin, FANG Fang, HONG Xu, ZHAO Xiang, ZHOU Wei, MA Yingjie. Design of digital multi-channel spectrometer based on auto-baseline restoration[J].Nuclear Techniques, 2018, 41(5): 50401-050401.

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

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