Ultrasonic leaky Rayleigh wave enables easy automated detection of surface or sub-surface defects due to its non-contact detection advantages. The existing leaky Rayleigh wave detection methods using single transducer suffer from low focused energy and short detection range. To solve these problems, this paper adopts the detection method of leaky Rayleigh wave generated by phased array, and proposes an imaging algorithm using extended phase shift migration (EPSM) and image fusion. Firstly, the virtual source-based extended phase shift migration (VSEPSM) algorithm is proposed to enhance the eff...
