E xperimental study on guided and standing waves based full field laser scanning for damage detection (original) (raw)

This paper describes the comparison study of wavenumber-based damage detection performance in full field laser scanning techniques. Two types of excitation methods (guided waves and standing waves) are used for damage detection. For the standing wave based technique, the steady-state response could be obtained from a Laser Doppler Vibrometer and a mirror tilting device using a single fixed frequency (>50 kHz) from a mounted piezoelectric transducer. Time variant and invariant feature based damage visualization method is used to estimate damage size and depth. For the guided wave based approach, the same procedure is used except that a piezo actuator generates a tone-burst excitation. For the comparison of these two techniques, several experiments are performed on an aluminium plates and a composite plate which contain various types of damage, including corrosion and crack on an aluminium plate and debonding on a composite plate. The results demonstrate that pros and cons of these...