Laser ultrasonic technique employs pulse laser to generate the Lamb waves in the structures

achieving long-distance and non-contact Lamb wave measurement. Aiming at the problems of the safety and reliability detection in aviation composite structures

the research topics on laser ultrasonic based composite structure testing are carried out at Nanjing University of Aeronautics and Astronautics. Novel signal processing methods have been developed to extract the Lamb wave propagation characteristics

which can be used in damage imaging

stiffness reconstruction and fatigue property evaluation. The theoretical and experimental results show that laser ultrasonic technique can provide a novel non-destructive testing method for the composite structures in the aviation industry.