A study of nuclear pulse signal digital Gaussian shaping based on dual-factor mode
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摘要: 阐述了一种基于脉宽和幅度双参数的新型核脉冲信号数字高斯成形模型的研究方法。以Sallen?Key滤波器(以下简称S?K滤波器)为基础,运用基尔霍夫电流定律建立输入信号Vi 和输出信号Vo 之间的数学关系方程。方程解算过程中,引入脉宽和幅度双因子进行参数替代,并运用数值微分算法迭代得到一个核脉冲信号数字高斯成形的数值递推模型。通过标准指数衰减信号和实际核信号仿真验证了该模型的正确性,也进行了成形参数的确定。最后,实测55 Fe核素标准谱线的结果显示在能量色散X荧光分析系统中应用数字高斯成形技术,提升了系统能量分辨率和计数通过率等性能指标,收到了良好效果。Abstract: The study of a novel model for digital nuclear pulse signal Gaussian shaping based on amplitude factor and width factor is de?scribed in this paper. According to Sallen?Key filter( S?K filter in short) , four formulae are established between the input and the output depending on Kirchhoff Current Law. With dual?factor parameter substitution, a general numerical recursive root is obtained by applying numerical differentiation algorithm. The correctness of the model is verified by computer simulation through the standard exponential de?cay signal and actual nuclear signal. The shaping factors are also confirmed. Finally, the digital Gaussian shaping technique is applied to the Energy Dispersive X?Ray Fluorescence system and, as a result, the spectrum of 55 Fe is obtained. Testing results show that digital shaping technique can improve the performance of the EDXRF system in such aspects as energy resolution and count ratio.
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