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Pulsed thermography digital motion stabilization for the unmanned vehicle inspection of solar farms and GFRP wind blades through UAVs and UGVs

Urtasun, Beñat; López De Uralde, Pablo; Velar, Karlos; Gorostegui, Eider; Neelov, Joonas; Wright, Steve; Studley, Matthew; Lima, Pedro; Vale, Alberto; Basiri, Meysam

Pulsed thermography digital motion stabilization for the unmanned vehicle inspection of solar farms and GFRP wind blades through UAVs and UGVs Thumbnail


Authors

Beñat Urtasun

Pablo López De Uralde

Karlos Velar

Eider Gorostegui

Steve Wright Steve.Wright@uwe.ac.uk
Associate Lecturer FET-EDM-UEDM0000

Matthew Studley Matthew2.Studley@uwe.ac.uk
Associate Professor in Technology Ethics

Pedro Lima

Alberto Vale

Meysam Basiri



Contributors

Joseph N. Zalameda
Editor

Arantza Mendioroz
Editor

Abstract

The quality control of structures and fuselages in both the wind-turbine and solar sectors is a fundamental part that allows a lifetime assessment of their elements, from its initial assembly to the recurring inspection cycles. Automating the active thermography on this scale, cannot be achieved with conventional industrial robots. Unmanned vehicles, such UAVs and UGVs, present distinctive advantages that should certainly be exploited, but, its inherent static motion is one of the main stumbling blocks towards its use in an active thermography inspection. In this paper, a two-step digital stabilization scheme has demonstrated its efficacy in real defects located in both a wind blade and solar panel. The combination of a featurebased registration algorithm and a dense parametric optical flow direct alignment has enabled the pseudo-static reconstruction of the thermograms. The adopted experimental methodology, employing a robot with both halogens and IR camera, subjected to random motions with varying speed and amplitudes, has allowed a direct repeatable comparison of static and stabilized phase images. The phase image contrast comparison of both static and dynamic tests, have been carried out on a flat bottom hole (FBH) wind blade GFRP sample, showing nearly identical phase contrast with marginal differences. Likewise, a real GFRP wind-blade impact delamination defect has also reached a close phase contrast regarding its counterpart, albeit with a decreased contrast. Additionally, the registration algorithm has been used to stitch the individual frames, derived from a dynamic recording of an electroluminescent solar panel, to allow for a unified detection and mapping of defects.

Citation

Urtasun, B., López De Uralde, P., Velar, K., Gorostegui, E., Neelov, J., Wright, S., …Basiri, M. (2021). Pulsed thermography digital motion stabilization for the unmanned vehicle inspection of solar farms and GFRP wind blades through UAVs and UGVs. In J. N. Zalameda, & A. Mendioroz (Eds.), https://doi.org/10.1117/12.2585902

Conference Name Thermosense: Thermal Infrared Applications XLIII
Conference Location Online Only, United States
Start Date Apr 12, 2021
End Date Apr 17, 2021
Acceptance Date Mar 31, 2021
Online Publication Date Apr 12, 2021
Publication Date Apr 12, 2021
Deposit Date Sep 13, 2021
Publicly Available Date Sep 14, 2021
Publisher Society of Photo-optical Instrumentation Engineers
Volume 11743
ISBN 9781510643239
DOI https://doi.org/10.1117/12.2585902
Public URL https://uwe-repository.worktribe.com/output/7275030

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Pulsed thermography digital motion stabilization for the unmanned vehicle inspection of solar farms and GFRP wind blades through UAVs and UGVs (1.8 Mb)
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Copyright Statement
© (2021) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE).

This is the author's accepted manuscript. The final published version is available here: https://doi.org/10.1117/12.2585902.





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