| .基于经验模态分解的超声波管外测压信号去噪[J].声学技术,2011,(5): |
| 基于经验模态分解的超声波管外测压信号去噪 |
| An EMD-based signal de-noising method for ultrasonic pressure measurement outside pipeline |
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| DOI： |
| 中文关键词: 经验模态分解 超声波 管外测压 去噪 |
| 英文关键词: empirical mode decomposition ultrasonic pressure measurement outside pipeline de-noising |
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| 中文摘要: |
| 在超声波管外测压中,回波信号往往受到噪声的干扰,所以在提取信号特征时,需对回波信号进行去噪。提出了一种基于经验模态分解(EMD)的超声波信号去噪方法,首先利用EMD求出信号的本征模态函数(IMF),然后通过对比分析,利用反映信号主要特征的模态分量对信号进行重构以实现去噪。实验结果表明,该方法能够有效地去除噪声,提高超声回波信号的信噪比。 |
| 英文摘要: |
| In ultrasonic pressure measurement outside pipeline,echo signal is disturbed by electronic noise,structure noise and so on.Before analysis,the ultrasonic echo signal should be de-noised to get better results.In this paper,a de-noising method of ultrasonic signal based on empirical mode decomposition(EMD) is proposed.Firstly,the original ultrasonic signal is decomposed into a finite number of intrinsic mode functions(IMF) by EMD,then the modes re-flecting the important features of the signal are combined tog... |
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