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18 October 2019 Image enhancement method for laser infrared thermography defect detection in aviation composites
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Abstract

A new infrared preprocessing modality called sequence differential processing is proposed. Different from the cold image subtraction which only decreases the background noise, the proposed modality takes the parallel test into account to preprocess the raw thermal data sequence prior to applying the advanced postprocessing techniques such as principal component thermography and pulsed phase thermography. The results show that the preprocessing method not only effectively reduces the influence of uneven laser energy distribution on detection efficiency but also enhances internal defect information. Moreover, the combination of the proposed preprocessing method with the pulsed phase thermography and principal component analysis algorithms improves the ability of laser infrared thermography to detect defects inside aviation carbon-fiber-reinforced plastics.

© 2019 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2019/$28.00 © 2019 SPIE
Qiang Wang, Qiuping Hu, Jinxing Qiu, Cuixiang Pei, Xinyi Li, Hongbin Zhou, Ruicong Xia, and Jia Liu "Image enhancement method for laser infrared thermography defect detection in aviation composites," Optical Engineering 58(10), 103104 (18 October 2019). https://doi.org/10.1117/1.OE.58.10.103104
Received: 5 August 2019; Accepted: 1 October 2019; Published: 18 October 2019
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