基于252Cf裂变中子源的核信息系统频谱分析
Spectrum analysis of nuclear information system based on 252Cf fission neutron source
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摘要: 针对252Cf裂变中子源所构造的核信息系统，在阐述随机核信号功率谱密度的算法原理基础上，借助于Matlab分析工具，采用分块平均法，对系统3个测量通道的随机核信号，先做相关计算，再对总的相关函数进行傅里叶变换，求得总功率谱，最后做平均得到所需的功率谱密度，得到了核信息系统的频谱图，并获得了相关函数多重性、相干性和功率谱密度比等重要参数。Abstract: The principle of random nuclear signal power spectrum density analysis is introduced. Using Matlab, block-averaging method is adopted to process the random nuclear signals from the three measurement channels in the nuclear information system of the 252Cf fission neutron source. Then correlation calculation is done for every block, and the derived correlation functions are summed up and then transformed into power spectrum with Fourier transform. Finally, power spectrum density estimates are obtained after averaging the spectrum. With these results, improtant parameters are got, such as correlation functions multiplicity, coherence and power spectrum density ratio.
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