Determination of thermal wave reflection coefficient to better estimate defect depth using pulsed thermography
Sirikham, Adisorn and Zhao, Yifan and Mehnen, Jörn (2017) Determination of thermal wave reflection coefficient to better estimate defect depth using pulsed thermography. Infrared Physics and Technology, 86. pp. 1-10. ISSN 1350-4495
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Abstract
Thermography is a promising method for detecting subsurface defects, but accurate measurement of defect depth is still a big challenge because thermographic signals are typically corrupted by imaging noise and affected by 3D heat conduction. Existing methods based on numerical models are susceptible to signal noise and methods based on analytical models require rigorous assumptions that usually cannot be satisfied in practical applications. This paper presents a new method to improve the measurement accuracy of subsurface defect depth through determining the thermal wave reflection coefficient directly from observed data that is usually assumed to be pre-known. This target is achieved through introducing a new heat transfer model that includes multiple physical parameters to better describe the observed thermal behaviour in pulsed thermographic inspection. Numerical simulations are used to evaluate the performance of the proposed method against four selected state-of-the-art methods. Results show that the accuracy of depth measurement has been improved up to 10% when noise level is high and thermal wave reflection coefficients is low. The feasibility of the proposed method in real data is also validated through a case study on characterising flat-bottom holes in carbon fibre reinforced polymer (CFRP) laminates which has a wide application in various sectors of industry.
Creators(s): | Sirikham, Adisorn, Zhao, Yifan and Mehnen, Jörn; | Item type: | Article |
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ID code: | 61631 |
Keywords: | non-destructive testing, least-squares fitting , optimisation, Engineering design, Industrial and Manufacturing Engineering |
Subjects: | Technology > Engineering (General). Civil engineering (General) > Engineering design |
Department: | Faculty of Engineering > Design, Manufacture and Engineering Management Strategic Research Themes > Advanced Manufacturing and Materials |
Depositing user: | Pure Administrator |
Date deposited: | 24 Aug 2017 16:15 |
Last modified: | 04 Feb 2021 04:24 |
Related URLs: | |
URI: | https://strathprints.strath.ac.uk/id/eprint/61631 |
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