Abstract
In this paper, an improved laser thermography method and system with laser beam homogenizing is developed to remote inspect delamination defect in carbon fiber reinforced polymer (CFRP) laminates. A fiber laser beam shaper is designed to transform the high-power laser beam with uneven intensity into large area square beam with uniform distribution. A numerical model of the optical system is developed to calculate and optimize the light intensity distribution of the output laser from the beam shaper. To investigate the performance of the laser thermography system with beam shaping, the temperature field in CFRP with a delamination defect, excited by different laser illumination, is simulated. Finally, an experimental comparison between conventional laser thermography without beam shaping and the proposed one is reported with two CFRP samples with different artificial defects. Both the simulation and experiment results show that the defect detection capability in the CFRP is significantly improved by the proposed laser thermography method with laser beam shaping.
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