骨架型电磁超声相控阵换能器设计

Aiming at the problem that the design method of the skeleton-type electromagnetic ultrasonic phased array transducer is not clear and the efficiency of energy transfer is low, a skeleton-type electromagnetic ultrasonic phased array transducer is studied and validated by combining the finite element method and the experimental method. The main results are as follows: modeling and analyzing the winding method of single channel EMAT coil, with the increase of angle, the sound pressure produced by horizontal winding method is significantly larger than that of vertical winding method; the sound field variation rule of electromagnetic ultrasonic phased array is analyzed in two ways, that is, the separation and overlap between coils, the result show that the amplitude of shear waves generated by the overlapping method is significantly greater than that of the separated winding method; on the basis of the above simulation analysis, the skeleton-type electromagnetic ultrasonic phased array transducer with the wire length of 10mm and the turns of 30 is developed, and the defect detection of the vertical hole with a diameter of 3mm in the aluminum plate is successfully realized.