The low energy transition efficiency of electromagnetic ultrasonic transducer (EMAT)\nis a common problem in practical application. For the purpose of enhancing the amplitude of the\nreceived signal, an improved double-coil bulk wave EMAT is proposed for the thickness measurement\nof metallic block. This new configuration of magnets consists of a solid cylindrical magnet and\na ring-shaped magnet encircling the outer side of the solid cylindrical one. A double-coil was applied\ninstead of a single spiral-coil. Numerical simulations were performed to analyze and optimize\nthe proposed configuration of the EMAT by the 2-D axisymmetric finite element model (FEM).\nThe experiment effectively verifies the rationality of the new configuration and the feasibility of\nimproving the signal strength.
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