Calculation model for the induced voltage of pick-up coil excited by rectangular coil above conductive plate

The electromagnetic NDT method plays an important role in the nondestructive material test. In testing conductive structures, the send-receive coils probe has more advantage than the absolute coil probe. One rectangular excitation coil is located above and parallel to moving conductive plate, another cylindrical pick-up coil is located on the opposite side across the moving conductive plate. The accurate theoretical expression of the induced voltage in the pick-up coil is derived by analytical method, then the influences of the excitation frequency, plate thickness and the moving speed of conductor to the induced voltage are analyzed. The analytical calculation results are verified with the implementation of finite element method.