Abstract
Network wavefield imaging methods are able to image significantly complex discontinuities or shapes in plate - like structures for superior ultrasonic structural health monitoring ( SHM ) / nondestructive evaluation ( NDE ) . The imaging provides high - resolution location , shape and / or size images of a structure , and for discontinuities with more complicated profiles . Guided wave ( GW ) network wavefield imaging methods combine tomography and wavefield / wavenumber imaging algorithms . Metallic plate damage detection uses guided ultrasonic waves and non - contact laser vibrometry . Guided waves are generated by piezoelectric transducers ( PZT ) . A non - contact scanning laser Doppler vibrometer ( SLDV ) measures the full velocity plate guided wave wave fields . Developed network wavefield imaging algorithms account for multiple - actuator excitations from different angles enclosing the discontinuity , with algorithms using intrinsic wave characteristics such as wavefield , wavenumber , or reconstructed wave energy . Determined locations , sizes and shapes of highlighted areas in wavefield, wavenumber and / or filter reconstructed energy - based images correlate with location , size and shape of damage in metallic plates.