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Laser Line Generation for Optimized Interaction with Hidden Defects in Active Thermography

: Yu, Shuanglu; Sui, Hao; Zhu, Hongna; Netzelmann, Udo; Müller, David


Xu, Chunguang (Ed.) ; Institute of Electrical and Electronics Engineers -IEEE-:
IEEE Far East NDT New Technology & Application Forum, FENDT 2019. Proceedings : June 24-27, 2019, Qingdao, China
Piscataway, NJ: IEEE, 2019
ISBN: 978-1-7281-3410-9
ISBN: 978-1-7281-3409-3
ISBN: 978-1-7281-3411-6
Far East NDT New Technology & Application Forum (FENDT) <2019, Qingdao>
National Natural Science Foundation of China NSFC
Conference Paper
Fraunhofer IZFP ()
laser thermography; edge effects; pulse-phase analysis; spatial derivation

In this paper, an active thermal imaging technique using a laser as an excitation source is used to detect aluminum specimens containing artificial defects. The presence of defects in the local excitation of the laser can produce better edge effects, using different laser excitation methods to improve edge effects. In the experiment, the laser scanning method is designed according to the characteristics of artificial defects, and the experimental data is analyzed. PPT and Sobel filtering are used to further data processing to obtain clearer defect edges and detect the detailed features of the defects. The study found that the detection effect is the best when the laser power and pulse width are large.