摘要
为了研制激光-电磁超声一体式探伤装置,利用该装置通过一次扫描同时获得金属板宽度和深度方向信息实现板内部和表面的同时探伤,文中主要针对激光-电磁超声一体式装置中电磁超声部分进行了结构优化。首先,利用有限元仿真软件,建立了激光-电磁超声一体式探伤装置的有限元仿真模型,验证了激光-电磁超声一体式探伤系统的可行性;然后,针对该一体式装置的电磁超声传感器部分结构参数进行了研究,提出在铜箔与永磁体之间粘贴一层泡沫缓冲层用于抑制永磁体内的感应电流、阻断超声波的传播,并分析了永磁体与线圈之间的提离距离对换能效率的影响。结果表明:当永磁体与线圈提离距离保持在0.8~1.2 mm之间时,信号强度和可识别性均增强。最后,利用实验验证理论分析及仿真模型的正确性。
In order to develop a laser-electromagnetic acoustic transducer(EMAT) integrated system, the width and depth of the metal plate can be obtained at the same time by one scan, so as to realize the simultaneous flaw detection of the interior and surface of the plate, the EMAT for the laser-EMAT integrated system was optimized.Firstly, the finite element model of the laser-EMAT integrated system was established using the finite element simulation software to verify the feasibility of the laser-EMAT integrated system.Secondly, the structural parameters of the EMAT applied to the integrated system were studied, and a layer of foam between the copper foil and the permanent magnet was proposed to restrain the induced current in the permanent magnet and block the propagation of ultrasonic wave, and the influence of the lift-off between the permanent magnet and the coil on the energy transfer efficiency was analyzed.The results show that the signal strength and the recognition are enhanced when the lift-off between the permanent magnet and the coil remains 0.8~1.2 mm.Finally, the validity of theoretical analysis and simulation model were verified by experiments.
作者
袁伟
刘泽
赵鹏飞
霍继伟
李俊杰
YUAN Wei;LIU Ze;ZHAO Peng-fei;HUO Ji-wei;LI Jun-jie(School of Electronic and Information Engineering,Beijing Jiaotong University,Beijing 100044,China;Standard&Metrology Research Institute,China Academy of Railway Sciences,Beijing 100081,China)
出处
《仪表技术与传感器》
CSCD
北大核心
2022年第12期96-101,107,共7页
Instrument Technique and Sensor
基金
国家重点研发计划资助项目(2020YFC2200704)。
