基于双指数核脉冲信号的数字反卷积与波形合成处理方法研究

Research on digital deconvolution and waveform synthesis processing method based on double exponential nuclear pulse signal

实时数字脉冲信号成形可以完成传统模拟方法难以实现的脉冲形状,故该文采用数字反卷积方法来消除双指数核信号的脉冲拖尾现象,并结合数字波形合成处理方法来提高核信号幅度分析能力。该文首先进行双指数核信号时域分析、数字反卷积滤波器设计以及cusp波形信号合成处理方法研究,并结合Matlab simulink工具箱与数字能谱测量硬件平台完成核信号波形仿真和实际信号测试验证。将上述波形处理方法应用在Cs-137同位素能谱测量中,与传统梯形成形方法相比能量分辨率由7.0%降低至6.5%,取得了良好应用效果。

Real-time digital pulse signal shaping can complete pulse shapes that are difficult to achieve by traditional analog methods.Therefore,this paper uses digital deconvolution method to eliminate the pulse tailing phenomenon of double exponential nuclear signals,and combines digital waveform synthesis processing methods to improve nuclear signal amplitude analysis ability.This paper first conducts time-domain analysis of double exponential nuclear signal,digital deconvolution filter design,and cusp waveform signal synthesis processing method,and combines the Matlab simulink toolbox and FPGA digital energy spectrum measurement hardware platform to complete the nuclear signal waveform simulation and actual test verification.Applying the above waveform processing method to the Cs-137 energy spectrum measurement,the energy resolution is reduced from 7.0%to 6.5%compared with the traditional trapezoidal method,and good application results have been achieved.