阵列电磁超声全矩阵采集与全聚焦成像方法研究

doi:10.3901/JME.260109

摘要/Abstract

摘要： 采用全聚焦方法实现电磁超声全聚焦成像检测，以跑道型线圈作为阵元，设计两个不同阵元宽度的八阵元横波线阵电磁超声传感器(Electromagnetic acoustic transducer, EMAT)，并建立电磁超声全矩阵数据采样试验系统。试验在试块不同位置上采集人工缺陷的电磁超声检测全矩阵数据，并通过后处理对缺陷进行全聚焦成像检测，研究电磁超声全聚焦成像检测缺陷的规律，初步分析影响电磁超声全聚焦成像检测的因素，同时对比分析不同阵元宽度线阵EMAT对电磁超声全聚焦成像检测的影响。结果表明，电磁超声全聚焦成像能够有效检测出试块不同区域内的缺陷，证明了电磁超声实现全聚焦成像的可行性和有效性，同时线阵EMAT的全聚焦成像受阵元辐射声场扩散性影响，在相同检测区域内较小阵元宽度的线阵EMAT能够获得更好的缺陷成像效果。

关键词: 电磁超声, 全聚焦成像, 线阵EMAT, 全矩阵数据, 辐射声场

Abstract: An electromagnetic acoustic total focusing imaging testing method based on the total focusing method(TFM) is proposed. Using racetrack coils as array elements, two eight-element transverse wave linear arrays EMAT with different element widths are designed. At the same time, an experimental system of electromagnetic acoustic full matrix data sampling was established. Through experiments, the full-matrix data of electromagnetic acoustic testing of artificial defects are collected at different positions of the specimen, and the defects were detected by TFM imaging through post-processing. The law of defect detection by electromagnetic acoustic TFM imaging is studied, and the factors that affect electromagnetic acoustic TFM imaging detection are preliminary analyzed, and the influence of linear array EMAT with different array element widths on electromagnetic acoustic TFM imaging is compared and analyzed. The results show that electromagnetic acoustic TFM can effectively detect defects in different areas of the specimen, which proves the feasibility and effectiveness of electromagnetic acoustic to achieve total focusing method imaging. The TFM imaging of the linear arrays EMAT is affected by the diffusion of the ultrasound field radiated by the array element, and the linear arrays EMAT with a smaller array element width in the same detection area can obtain a better defect imaging effect.

Key words: electromagnetic ultrasound, full focus imaging, linear array EMAT, full matrix data, radiated sound field

中图分类号:

TB553

郑阳, 张宗健. 阵列电磁超声全矩阵采集与全聚焦成像方法研究[J]. 机械工程学报, 2026, 62(4): 98-106.

ZHENG Yang, ZHANG Zongjian. Research on Testing Method of Electromagnetic Acoustic Total Focusing Method Imaging[J]. Journal of Mechanical Engineering, 2026, 62(4): 98-106.

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