Abstract
The paper proposes an inverse reconstruction method for surface flaws in a 2-D half-space using guided Rayleigh waves. When a guided Rayleigh wave is sent toward the flaw area, the reflected wave signals are observed and recorded at the far field. From wave scattering theory, the displacement field of reflected wave is expressed by an integral over the unknown flaw surface concerning the total wave field. By introduction of Born approximation and far-field expressions of Green's function, it is found that the reflection coefficient in wavenumber domain is related to the unknown shape of the cavity by a spatial Fourier transform relation. Thus, the location and shape of unknown cavity can be established. Numerical examples are illustrated in the paper. The research can act as a basis for quantitative ultrasonic guided wave non-destructive inspection.
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