关键词: 经验模态分解, 激光超声信号, 信号去噪

Abstract: Based on the criterion of consecutive mean square error, a de-noising method for laser ultrasonic signals based on empirical mode decomposition(EMD) was proposed. This method can divide the intrinsic mode functions (IMFs) derived from EMD into signal dominant modes and noise dominant modes, then the modes reflecting the important structures of a signal were combined together to form partially reconstructed de-noised signal. Simulations were conducted for simulated signals and a real laser ultrasonic signal using this method. Experimental results indicate that this method can efficiently and adaptively remove noise, and this method can not be affected by subjective parameters.

Key words: empirical mode decomposition, laser ultrasonic signal, signal de-noising