Transfer Functions to Remove the Effect of Corners on Rayleigh Waves

Abstract

This research uses laser ultrasonic techniques to develop transfer functions that remove the effect of geometric features on experimentally measured Rayleigh waves. These transfer functions are developed using a repeatable, broadband optical source and a high-fidelity sensor, a dual probe, laser interferometer. The transfer functions are developed by comparing the frequency changes between incident and transmitted Rayleigh waves that interact with a prescribed corner. These transfer functions are used to operate on different signals (waves) that contain the effect of both the corner and a defect, to remove the effect of the corner and isolate the contribution of the defect. The accuracy of these transfer functions is demonstrated and the robustness of the proposed technique is established.