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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Defect Detection of Aluminium Plates Based on Near-Field Enhancement of Lamb Waves Generated Using an Electromagnetic Acoustic Tranducer
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Defect Detection of Aluminium Plates Based on Near-Field Enhancement of Lamb Waves Generated Using an Electromagnetic Acoustic Tranducer

机译：基于电磁声换能器产生的兰姆波近场增强的铝板缺陷检测

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摘要

Ultrasonic testing is an important means to detect defacing defects, such as scratches and cracks, but when the size of these defects is smaller than the wavelength of ultrasonic waves, it is difficult to detect them using traditional methods like the pulse-echo method and broadband ultrasound attenuation method for the diffraction of ultrasonic waves at the defects. Based on the non-contact characteristic of electromagnetic acoustic transducers (EMATs), a transducer for scanning inspection was developed in this paper. The transducer was utilized to detect and measure the depth of the defacing defects on an aluminium plate based on the near-field enhancement of ultrasonic Lamb waves. The results show that the amplitude of the S0 Lamb wave experiences a large enhancement when the transducer is passed over the scratch defects and the enhancement has a clearly positive correlation with the depth of the scratch defects. When the depth increases from 0.1 mm to 0.9 mm, the amplitude of S0 Lamb waves increases from 1.13 times to 2.27 times the S0 Lamb waves received on the aluminium plate without defects. The new method can be utilized to detect the defacing defects on the aluminium plate and get better detection effects than the traditional methods without analyzing the relatively small reflection waves.
机译：超声波测试是检测划痕和裂纹等表面缺陷的重要手段，但是当这些缺陷的大小小于超声波的波长时，很难使用脉冲回波法和宽带法等传统方法进行检测。超声衰减法用于超声波在缺陷处的衍射。基于电磁声换能器（EMAT）的非接触特性，本文开发了一种用于扫描检查的换能器。该换能器用于基于超声波兰姆波的近场增强来检测和测量铝板上的表面缺陷的深度。结果表明，当换能器通过划痕缺陷时，S0 Lamb波的振幅将经历较大的增强，并且增强与划痕缺陷的深度具有明显的正相关性。当深度从0.1 mm增加到0.9 mm时，S0 Lamb波的振幅从无缺陷的铝板上接收的S0 Lamb波的1.13倍增加到2.27倍。与传统方法相比，无需对反射波进行比较小的分析，就可以检测出铝板上的表面缺陷，获得更好的检测效果。

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