摘要
介绍了小波去噪的基本理论,用4种不同的小波阈值对γ谱去噪效果进行了比较研究。采用的数据为实验室标准137Cs能谱的测量数据,测量仪器为NaI便携式γ谱仪,针对137Cs的γ能谱分别用4种不同的阈值规则进行了小波去噪效果的比较。最后以MATLAB GUI为软件平台,设计了一套基于小波函数的γ能谱去噪效果评价系统。实验表明,该系统可以方便地从混有噪声的信号中提取原始信号,并计算出去噪前后能谱的能量比和标准差,从而可以得到最佳的去噪方案。
Wavelet analysis method has become a very important tool in eliminating noise. It introduces the bas- ic theory of noise elimination by utilizing wavelet analysis which compares four different types of wavelet thresh- old values. The data in the paper is obtained from standard spectrum of137 Cs that is measured by NaI portable gamma energy spectrometer. Based on the wavelet function and using MATLAB GUI as a software platform, a kind of denoising assessment system is developed. The study has shown that the developed system is able to ex- tract original signal easily from the signal mixed with noise and calculate both energy ratio and standard devia- tion. Finally, the better threshold function for reducing noise of gamma energy spectrum is presented and future research issues are suggested.
出处
《核电子学与探测技术》
CAS
CSCD
北大核心
2013年第10期1245-1247,1270,共4页
Nuclear Electronics & Detection Technology
基金
国家杰出青年科学基金项目(41025015)
国家自然科学基金项目(41274109)
四川省青年科技创新研究团队项目(2011JTD0013)
四川省科技支撑计划
