【摘 要】
：
Electromagnetic acoustic transducer is a kind of non-contact ultrasonic transmitting and receiving device which has enormous potential in NDT.However,the te
【机 构】
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China Special Equipment Inspection and Research Institute,Beijing,China
【出 处】
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The 2nd International Conference on Structural Health Monito
论文部分内容阅读
Electromagnetic acoustic transducer is a kind of non-contact ultrasonic transmitting and receiving device which has enormous potential in NDT.However,the testing results of EMAT are significantly affected by measuring parameters,e.g.material,lift-off,coil pattern and so on.This paper study the effect of materials.And three materials 20# steel,16MnR steel and Aluminum are considered.Experimental results show that under the same inspecting conditions,EMAT testing with ferromagnetic material has a shorter near field.Comparing with signals from EMAT mainly working with magnetostriction force and magnetization force,signals from EMAT mainly working with Lorentz force mechanism will have bigger repeated measurement variation.
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