| 袁阿琳,赖迎庆,石剑,段检发,卢超,石文泽.铝薄板裂纹电磁超声导波B扫描检测实验研究[J].声学技术,2022,41(2):211~219 |
| 铝薄板裂纹电磁超声导波B扫描检测实验研究 |
| Experimental research on B-scan detection of electromagnetic ultrasonic guided wave for aluminium sheet cracks |
| 投稿时间：2020-12-01 修订日期：2021-03-24 |
| DOI：10.16300/j.cnki.1000-3630.2022.02.010 |
| 中文关键词: 铝板 SH导波 电磁超声换能器(EMAT) 同步挤压小波变换 B扫描 |
| 英文关键词: aluminium sheet SH guided wave electromagnetic acoustic transducer (EMAT) synchrosqueezed wavelet transform B-scan |
| 基金项目:国家自然科学基金（12064001）资助项目。 |
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| 中文摘要: |
| 采用Disperse软件，计算了3 mm厚度铝合金薄板的水平剪切(Shear horizontal,SH)导波频散曲线，设计制作了中心频率为0.22 MHz的SH导波电磁超声换能器(Electromagnetic acoustic transducer,EMAT)，对铝薄板试样中直裂纹进行了B扫成像检测实验分析，采用同步挤压小波变换(Synchrosqueezed wavelet transform,SWT)对来自铝薄板试样中直裂纹SH导波信号进行了去噪处理。实验结果表明，SWT可以去除原始导波信号中的噪声，并实现导波模态分离，有助于改善B扫图像的质量。所设计的SH导波EMAT能够有效地检出3 mm厚铝薄板试样中10 mm长、1 mm宽、2 mm深的人工直裂纹。 |
| 英文摘要: |
| In this paper, the Disperse software is used to calculate the dispersion curves of shear-horizontal (SH) guided wave in a 3 mm thick aluminium sheet, an electromagnetic acoustic transducer (EMAT) with a center frequency of 0.22 MHz is developed to generate SH guided wave, and the experimental research on B-scan imaging detection of the straight cracks in the aluminium sheet is carried out. The synchrosqueezed wavelet transform (SWT) is used to de-noise the SH guided wave signal from the straight cracks. Experimental results show that SWT can remove the noise in the original guided wave signal, realize the guided wave mode separation and improve the quality of the B-scan image. The designed SH guided wave EMAT can effectively detect the artificial direct crack of 10 mm long, 1 mm wide and 2 mm deep in the 3 mm thick aluminum sheet specimens. |
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