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。
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 together to reconstruct the de-noised signal.The experimental results show that this method has better performance in removing the noise and enhancing the signal-to-noise ratio（SNR） of ultrasonic echo signal.
出处
《声学技术》
CSCD
2011年第5期427-431,共5页
Technical Acoustics
关键词
经验模态分解
超声波
管外测压
去噪
empirical mode decomposition
ultrasonic
pressure measurement outside pipeline
de-noising
