Abstract
Active Infrared Thermography (AIRT) is a hi-technology non-destructive and non-contact evaluation approach for the health monitoring of structures. Thermograms are analyzed by searching for abnormal temperature differences, indicating a potential problem. AIRT is often performed in an airtight place. Therefore, it is challenging to apply in the field. The study's primary purpose is to approach AIRT's possibilities for on-site construction works under wind influence. This study conducted a series of AIRT tests on a concrete specimen considering different wind speeds. Fans were installed to transfer parallel flow to the concrete specimen surface during the test. Two wind speed regimes were applied, including 5 and 7 mph (or 8–11 km/h approximately). The results show that the observation time (an important parameter to predict the subsurface defect depth) and the contrast of the thermal images (for detectability of subsurface defect) decrease with accelerating wind speed. In other words, the subsurface defects in the concrete structures might be tough to be detected under wind impact. The thermal contrast of images can be reduced under wind influence, but it might still be possible to locate the subsurface defects. In contrast, shorter observation time under forced convection (by wind) will lead to a significant error in predicting the defect depth, especially for shallow defects. Thus, AIRT can be applied to look for potential defects under a light breeze, but it should not be used to predict the subsurface defect depth unless suitable shielding is available.
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Data Availability
The data that supports the finding in this study are not publicly available. Any access request should be sent to huytq@ntu.edu.vn.
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Acknowledgements
This research was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. 2021R1A2C1005587) and a grant (No. TR2020-13-23) funded by Nha Trang University.
Funding
The National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT), Grant Number 2021R1A2C1005587, and Nha Trang University, Grant Number TR2020-13-23.
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QHT: Conceptualization, Methodology, Formal analysis, Software, Data curation, Investigation, Writing-Original draft, Visualization, Validation. QMD and XTP: Software, Data curation, Visualization. QHT and JH: Validation, Resources, Writing-review & editing, Supervision. All authors reviewed the manuscript.
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Tran, Q.H., Dang, Q.M., Pham, X.T. et al. Impact of Wind Speed on the Use of Active Infrared Thermography. J Nondestruct Eval 42, 35 (2023). https://doi.org/10.1007/s10921-023-00948-8
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DOI: https://doi.org/10.1007/s10921-023-00948-8