基于采样定理的核信号数字高斯滤波成形研究  

Research on Digital Gaussian Shaping Filter for Nuclear Signals Based on Sampling Theorem

作　　者：葛青[1] 葛良全[1] 吴建平[1] 李晓丽[1] 

机构地区：[1]成都理工大学核自院,成都610059

出　　处：《核电子学与探测技术》2014年第10期1201-1203,1212,共4页Nuclear Electronics & Detection Technology

基　　金：863计划资源环境技术领域课题(2012AA061803)资助;成都理工大学2013-2016年高等教育人才培养质量和教学改革项目阶段成果(13JGY25);国土资源部航空地球物理与遥感地质重点实验室航遥青年创新基金资助(2013YFL07)

摘　　要：核能谱分析仪中,常采用模拟滤波成形电路处理探测器的输出信号,以满足后级电路对信号波形的需要并滤除噪声。由模拟电路实现的高斯成形系统,改变成形参数必须对硬件进行调整,灵活性及稳定性均不理想。为实现数字滤波成形,根据模拟Sallen-Key高斯滤波成形电路,推导出模拟高斯成形系统的冲激响应;再根据采样定理推导出了数字高斯成形系统的冲激响应。用该数字高斯成形系统对实测核脉冲信号进行处理的结果显示,数字核脉冲信号被滤波成形为准高斯信号,为核脉冲信号数字滤波成形的实现提供了一种新的实现方法。In order to give the uncertainty of activity concentration of radio xenon which leaked into air after nu -clear fission happened , it was supposed that the radio xenon leakage was instantaneous , and the radio xenon leaked into a confined space ,the distribution was uniform .After decay correction and in principle that the theo-retical value of the average activity is consistent with the measuring values ,the mathematical model of the air-borne radio xenon monitoring was derived .By analyzing the sources of uncertainty ,the uncertainty components evaluation , synthesis ,and the mathematics model was evaluated under the certain condition .In the sources of uncertainty ,radio xenon peak net count rate and efficiency value are the main sources ,the concentration ,volume of xenon in air and gamma -ray emission rate of radio xenon are smaller ,the decay constant and time measure-ment are the least .

关 键 词：核脉冲信号 数字高斯滤波成形 采样定理 

分 类 号：TL82[核科学技术—核技术及应用]