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Reconfigurable Laser-Stimulated Lock-In Thermography for Surface Micro-Crack Detection

Surface crack detection and sizing is essential for the manufacturing and maintenance of engines, run parts, and other metal elements of aircrafts. Among various non-destructive detection methods, the fully non-contact and non-intrusive technique based on laser-stimulated lock-in thermography (LLT)...

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Detalles Bibliográficos
Autores principales: Ding, Lu, Gorelik, Sergey, Wang, Pei, Sadovoy, Anton Valentinovich, Zhu, Qiang, Ngo, Andrew Chun Yong, Teng, Jinghua
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10143150/
https://www.ncbi.nlm.nih.gov/pubmed/37112431
http://dx.doi.org/10.3390/s23084090
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author Ding, Lu
Gorelik, Sergey
Wang, Pei
Sadovoy, Anton Valentinovich
Zhu, Qiang
Ngo, Andrew Chun Yong
Teng, Jinghua
author_facet Ding, Lu
Gorelik, Sergey
Wang, Pei
Sadovoy, Anton Valentinovich
Zhu, Qiang
Ngo, Andrew Chun Yong
Teng, Jinghua
author_sort Ding, Lu
collection PubMed
description Surface crack detection and sizing is essential for the manufacturing and maintenance of engines, run parts, and other metal elements of aircrafts. Among various non-destructive detection methods, the fully non-contact and non-intrusive technique based on laser-stimulated lock-in thermography (LLT) has recently attracted a lot of attention from the aerospace industry. We propose and demonstrate a system of reconfigurable LLT for three-dimensional surface crack detection in metal alloys. For large area inspection, the multi-spot LLT can speed up the inspection time by a factor of the number of spots. The minimum resolved size of micro-holes is ~50 µm in diameter limited by the magnification of the camera lens. We also study the crack length ranging from 0.8 to 3.4 mm by varying the modulation frequency of LLT. An empirical parameter related to the thermal diffusion length is found to show the linear dependence with the crack length. With the proper calibration, this parameter can be used to predict the sizing of the surface fatigue cracks. Reconfigurable LLT allows us to quickly locate the crack position and accurately measure its dimensions. This method is also applicable to the non-destructive detection of surface or sub-surface defect in other materials used in various industries.
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spelling pubmed-101431502023-04-29 Reconfigurable Laser-Stimulated Lock-In Thermography for Surface Micro-Crack Detection Ding, Lu Gorelik, Sergey Wang, Pei Sadovoy, Anton Valentinovich Zhu, Qiang Ngo, Andrew Chun Yong Teng, Jinghua Sensors (Basel) Article Surface crack detection and sizing is essential for the manufacturing and maintenance of engines, run parts, and other metal elements of aircrafts. Among various non-destructive detection methods, the fully non-contact and non-intrusive technique based on laser-stimulated lock-in thermography (LLT) has recently attracted a lot of attention from the aerospace industry. We propose and demonstrate a system of reconfigurable LLT for three-dimensional surface crack detection in metal alloys. For large area inspection, the multi-spot LLT can speed up the inspection time by a factor of the number of spots. The minimum resolved size of micro-holes is ~50 µm in diameter limited by the magnification of the camera lens. We also study the crack length ranging from 0.8 to 3.4 mm by varying the modulation frequency of LLT. An empirical parameter related to the thermal diffusion length is found to show the linear dependence with the crack length. With the proper calibration, this parameter can be used to predict the sizing of the surface fatigue cracks. Reconfigurable LLT allows us to quickly locate the crack position and accurately measure its dimensions. This method is also applicable to the non-destructive detection of surface or sub-surface defect in other materials used in various industries. MDPI 2023-04-19 /pmc/articles/PMC10143150/ /pubmed/37112431 http://dx.doi.org/10.3390/s23084090 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ding, Lu
Gorelik, Sergey
Wang, Pei
Sadovoy, Anton Valentinovich
Zhu, Qiang
Ngo, Andrew Chun Yong
Teng, Jinghua
Reconfigurable Laser-Stimulated Lock-In Thermography for Surface Micro-Crack Detection
title Reconfigurable Laser-Stimulated Lock-In Thermography for Surface Micro-Crack Detection
title_full Reconfigurable Laser-Stimulated Lock-In Thermography for Surface Micro-Crack Detection
title_fullStr Reconfigurable Laser-Stimulated Lock-In Thermography for Surface Micro-Crack Detection
title_full_unstemmed Reconfigurable Laser-Stimulated Lock-In Thermography for Surface Micro-Crack Detection
title_short Reconfigurable Laser-Stimulated Lock-In Thermography for Surface Micro-Crack Detection
title_sort reconfigurable laser-stimulated lock-in thermography for surface micro-crack detection
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10143150/
https://www.ncbi.nlm.nih.gov/pubmed/37112431
http://dx.doi.org/10.3390/s23084090
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