基于FPGA的磁量热计数据采集系统研制

TL99; 磁量热计是基于量热法的低温粒子探测器,可实现射线高分辨测量.为解决磁量热信号微弱易受到噪声影响导致信号采集困难的难题,本研究基于现场可编程门阵列(FPGA)研发了一套磁量热计数据采集系统,并对搭建的系统进行测试,成功实现了60Co能谱数据和磁量热信号噪声谱的采集,且能谱展宽与信号放大倍数之间的线性拟合R2 达到 0.9781,表明该系统可有效实现信号采集.在离线模式下使用梯形滤波、平顶尖峰滤波、高斯滤波对传统核探测器信号、模拟及实际的磁量热信号分别进行成形效果及能量分辨力优化效果的对比,三者中平顶尖峰滤波性能最优越,可以使高纯锗对241Am源59.54 keV的γ能量分辨力从 0....

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Published in同位素 Vol. 37; no. 5; pp. 463 - 471
Main Authors 李阳, 徐利军, 刘蕴韬, 朱保吉, 张雨禾, 金琦, 周宗正, 李元桥, 林敏, 郝丽杰, 王洪亮, 金诗淳
Format Journal Article
LanguageChinese
Published 中国原子能科学研究院计量与校准技术重点实验室,北京 102413 2024
Subjects
cusp filtering
FPGA
数据采集系统
data acquisition system
field programmable gate array
gaussian filtering
trapezoidal filtering
平顶尖峰滤波
梯形滤波
高斯滤波
Online AccessGet full text
ISSN1000-7512
DOI10.7538/tws.2024.youxian.053

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Abstract TL99; 磁量热计是基于量热法的低温粒子探测器,可实现射线高分辨测量.为解决磁量热信号微弱易受到噪声影响导致信号采集困难的难题,本研究基于现场可编程门阵列(FPGA)研发了一套磁量热计数据采集系统,并对搭建的系统进行测试,成功实现了60Co能谱数据和磁量热信号噪声谱的采集,且能谱展宽与信号放大倍数之间的线性拟合R2 达到 0.9781,表明该系统可有效实现信号采集.在离线模式下使用梯形滤波、平顶尖峰滤波、高斯滤波对传统核探测器信号、模拟及实际的磁量热信号分别进行成形效果及能量分辨力优化效果的对比,三者中平顶尖峰滤波性能最优越,可以使高纯锗对241Am源59.54 keV的γ能量分辨力从 0.598 keV提高到 0.536 keV,验证了数字滤波的必要性,可为磁量热计数字滤波方法选择提供可靠依据.
AbstractList TL99; 磁量热计是基于量热法的低温粒子探测器,可实现射线高分辨测量.为解决磁量热信号微弱易受到噪声影响导致信号采集困难的难题,本研究基于现场可编程门阵列(FPGA)研发了一套磁量热计数据采集系统,并对搭建的系统进行测试,成功实现了60Co能谱数据和磁量热信号噪声谱的采集,且能谱展宽与信号放大倍数之间的线性拟合R2 达到 0.9781,表明该系统可有效实现信号采集.在离线模式下使用梯形滤波、平顶尖峰滤波、高斯滤波对传统核探测器信号、模拟及实际的磁量热信号分别进行成形效果及能量分辨力优化效果的对比,三者中平顶尖峰滤波性能最优越,可以使高纯锗对241Am源59.54 keV的γ能量分辨力从 0.598 keV提高到 0.536 keV,验证了数字滤波的必要性,可为磁量热计数字滤波方法选择提供可靠依据.
Abstract_FL Metallic magnetic calorimeters are a class of low-temperature particle detectors based on calorimetry,utilizing metallic paramagnetic temperature sensors to convert the temperature rise of an absorber upon the absorption of incident particle energy into a change in magnetic flux,which detected by a superconducting quantum interference device(SQUID).This process enables high-resolution measurements of radiation with exceptional precision.However,metallic magnetic calorimeter signals are inherently weak and highly susceptible to noise,making the extraction of pulse amplitude a significant challenge.Digital signal processing(DSP)plays a crucial role in the data processing of metallic magnetic calorimeter by employing digital filtering techniques to shape the signals and enhance energy resolution.This paper introduces a data acquisition system for metallic magnetic calorimeter based on a field-programmable gate array(FPGA),designed for high-speed signal acquisition,real-time control,signal processing,and display of spectra through an upper computer.Testing of the system yielded successful acquisition of both Co-60 spectra data and noise spectrum of metallic magnetic calorimeter.The linear correlation coefficient of R2 reached 0.9781,demonstrates the system's effective signal acquisition capability.In offline mode,the shaping effects and energy resolution enhancement of traditional nuclear detector signals,simulated,and actual metallic magnetic calorimeter signals were compared using three filtering methods:trapezoidal,cusp,and gaussian filtering.The cusp filter proved to be the most effective,significantly improving the energy resolution of high-purity germanium spectra from 0.598 keV to 0.536 keV.This enhancement validates the correctness of digital signal processing and provides a reliable basis for the selection of digital filtering methods for metallic magnetic calorimeter.In summary,our research presents a comprehensive approach to metallic magnetic calorimeter signal acquisition and processing,highlighting the potential of digital signal processing to overcome the problem of the extraction of weak signals submerged in strong noise.The FPGA-based data acquisition system developed in this study offers an efficient solution for high-resolution radiation measurements.
Author 朱保吉
王洪亮
张雨禾
徐利军
刘蕴韬
林敏
金琦
李阳
郝丽杰
金诗淳
周宗正
李元桥
AuthorAffiliation 中国原子能科学研究院计量与校准技术重点实验室,北京 102413
AuthorAffiliation_xml – name: 中国原子能科学研究院计量与校准技术重点实验室,北京 102413
Author_FL ZHANG Yuhe
LIN Min
WANG Hongliang
ZHU Baoji
JIN Qi
XU Lijun
LIU Yuntao
ZHOU Zongzheng
LI Yang
HAO Lijie
LI Yuanqiao
JIN Shichun
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  fullname: 李阳
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Issue 5
Keywords cusp filtering
FPGA
数据采集系统
data acquisition system
field programmable gate array
gaussian filtering
trapezoidal filtering
平顶尖峰滤波
梯形滤波
高斯滤波
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Snippet TL99; 磁量热计是基于量热法的低温粒子探测器,可实现射线高分辨测量.为解决磁量热信号微弱易受到噪声影响导致信号采集困难的难题,本研究基于现场可编程门阵列(FPGA)研发了一套磁量热计数据采集系统,并对搭建的系统进行测试,成功实现了60Co能谱数据和磁量热信号噪声谱的采集,且能谱展宽与信号放大倍数之间的线性拟合R2...
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Title 基于FPGA的磁量热计数据采集系统研制
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