Two-dimensional simulation of the single-sided air-coupled ultrasonic pitch-catch technique for non-destructive testing

摘要: Non-contact air-coupled ultrasonic inspection of materials using single-sided access offers interesting possibilities for the development in-line non-destructive testing (NDT) systems. This contribution reports observations and simulations obtained from a pitch-catch configuration. The technique involves set-up in which transmitter receiver are located at same side test object. Sound waves, reflected once or multiple times back-wall object refracted by discontinuity, recorded analyzed visualization. feasibility is demonstrated, experimentally, case artificial defects aluminium samples. Depending on configuration one more images defect can be observed, their number relative position containing information about location defect. experiments simulated two distinctive methods. first simulation based ray tracing (shadow) approach, second method uses spectral solution implemented within COMSOL. Both methods allow simple prediction response experimental conditions with supplementary levels complexity, will assist optimization online techniques.