| 快速傅里叶变换在喇曼光谱信号噪声平滑中的应用 |
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| 引用本文： | 陈天江,王亚丽,普小云. 快速傅里叶变换在喇曼光谱信号噪声平滑中的应用[J]. 云南大学学报(自然科学版), 2005, 27(6): 509-513 |
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| 作者姓名： | 陈天江 王亚丽 普小云 |
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| 作者单位： | 1. 云南大学物理系,云南,昆明,650091;中国工程物理研究院,四川,绵阳,621900
2. 云南大学物理系,云南,昆明,650091 |
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| 基金项目： | 国家自然科学基金资助项目(10174060,10564005)，云南省自然科学基金资助项目(2003A009R) |
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| 摘 要： | 通过快速傅里叶变换(FFT)处理水的普通喇曼散射光谱信号,实现对其干扰噪声的抑制,获得信噪比较高的喇曼光谱.结果表明,通过快速傅里叶变换,获得弱信号源的目标信号和噪声信号的频谱,针对实验获得的弱信号喇曼光谱进行低通滤波和门限滤波,可以分别将具有高频和较低振幅的噪声信号去除,从而实现噪声平滑并获得高信噪比的喇曼光谱.
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| 关 键 词： | 快速傅里叶变换 弱信号 噪声平滑 喇曼光谱 |
| 文章编号： | 0258-7971(2005)06-0509-05 |
| 修稿时间： | 2005-07-07 |
The application of fast Fourier transform in the noise smoothing of weak Raman spectrum |
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| CHEN Tian-jiang,WANG Ya-li,PU Xiao-yun. The application of fast Fourier transform in the noise smoothing of weak Raman spectrum[J]. Journal of Yunnan University(Natural Sciences), 2005, 27(6): 509-513 |
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| Authors: | CHEN Tian-jiang WANG Ya-li PU Xiao-yun |
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| Affiliation: | CHEN Tian-jiang~ |
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| Abstract: | By using the method of fast Fourier transform(FFT),spontaneous Raman signal of water is handled,and the Raman spectra with high signal to noise ratio(SNR) has been obtained by reducing noises.Low pass and threshold filters have been used to handle the numerical data of Raman signal.The former wipes off the noise component if its frequency is higher than frequency of cut-off(FC),and the latter wipes off the noise component if its amplitude is lower than that of noise with maximal amplitude,the noise is reduced and the Raman spectrum with high SNR can be obtained. |
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| Keywords: | FFT weak signal noise smoothing Raman spectrum |
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