Transactions of Nanjing University of Aeronautics & Astronautics
Design and Optimization of Electromagnetic Ultrasonic Body Wave Probe Based on Halbach Structure
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Abstract:
A shear wave electromagnetic acoustic transducer （EMAT） optimized structure is proposed by using circumferential annular Halbach magnet structure. Based on the orthogonal test， the effects of the coil conductor width， the spacing between adjacent conductors， the number of turns and the lifting distance on EMAT energy conversion effect are studied， and the optimal parameter combination is given. The structural design of the Halbach magnet is proposed. The cost coefficient S of the Halbach structure is defined， and the optimal thickness of auxiliary magnetic pole is obtained. The optimized EMAT coil diameter is reduced by 35% and the echo signal strength is significantly improved. Finally， C-scan imaging is carried out on the sample to verify the detection ability of EMAT.
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Clc Number:
TB552
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