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《Chinese Journal of Sensors and Actuators》 2018-06
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Electromagnetic Acoustic Transducer with Sucker Type Pulsed Electromagnet

ZHENG Yang;LI Zhihang;ZHANG Zongjian;TAN Jidong;China Special Equipment Inspection and Research Institute,Key Laboratory of Nondestructive Testing and Evaluation of AQSIQ;North University of China,School of Mechanical and Power Engineering;  
Electromagnetic Acoustic Transducer with Electromagnet has the advantages of good contacting and moving convenience than that with permanent magnet. However,the research and develop work was much less until now. This paper proposed an electromagnetic ultrasonic sensor with sucker type pulsed electromagnet,which can better adapt to the planar coil and realize the excitation and reception of ultrasonic wave. For verifying the validity of the sensor,a common experiment system for pulsed electromagnet EMAT was established. The effectiveness was proved by a pulse-echo test on ferromagnetic and non-ferromagnetic materials. And the effects of tested material,excitation current and lift-off distance on inspection signal was studied. The results show that the energy conversion efficiency of the sensor on the ferromagnetic material is much greater than that on the non-ferromagnetic material. The amplitude of the sensor detection signal increases linearly with the excitation current and decays with the lift-off distance by inverse proportional function relationship.
【Fund】: 国家自然科学基金项目(51605494);; 国家重点研发计划项目(2016YFF0203003);; 质检公益性行业科研专项项目(201510068)
【CateGory Index】: TB553;TP212
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