Dynamic Wind Turbine Blade Inspection Using Micro-Polarisation Spatial Phase Shift Digital Shearography

Shearography, as a novel non-destructive evaluation technique, has shown notable ability in the detection of composite materials. However, in current shearography practices, the phase shifting and loading methods applied are mainly static. For instance, vacuum hood or force loading facilities are of...

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Autores principales:	Zhiyao Li, Mohammad Osman Tokhi, Ryan Marks, Haitao Zheng, Zhanfang Zhao
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	digital shearography spatial phase shift temporal phase shift non-destructive testing wind turbine blade Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/c1aee3913d134a0cb90faf73fae10929
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id	oai:doaj.org-article:c1aee3913d134a0cb90faf73fae10929
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spelling	oai:doaj.org-article:c1aee3913d134a0cb90faf73fae109292021-11-25T16:35:40ZDynamic Wind Turbine Blade Inspection Using Micro-Polarisation Spatial Phase Shift Digital Shearography10.3390/app1122107002076-3417https://doaj.org/article/c1aee3913d134a0cb90faf73fae109292021-11-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/22/10700https://doaj.org/toc/2076-3417Shearography, as a novel non-destructive evaluation technique, has shown notable ability in the detection of composite materials. However, in current shearography practices, the phase shifting and loading methods applied are mainly static. For instance, vacuum hood or force loading facilities are often used in phase-shifting shearography, and these are hard to realise with robotic control, especially for on-board inspection. In this study, a dynamic process for detecting defects in the subsurface of a wind turbine blade (WTB) using spatial phase shift with dynamic thermal loading was proposed. The WTB sample underwent a dynamic thermal loading operation, and its status is captured by a Michelson interferometric-based spatial phase shift digital shearography system using a pixelated micro-polarisation array sensor. The captured images were analysed in a 2D frequency domain and low-pass filtered for phase map acquisition. The initial phase maps underwent a window Fourier filtering process and were integrated to produce a video sequence for realisation of visualising the first derivative of the displacement in the process of thermal loading. The approach was tested in experimental settings and the results obtained were presented and discussed. A comparative assessment of the approach with shearography fringe pattern analysis and temporal phase shift technique is also presented and discussed.Zhiyao LiMohammad Osman TokhiRyan MarksHaitao ZhengZhanfang ZhaoMDPI AGarticledigital shearographyspatial phase shifttemporal phase shiftnon-destructive testingwind turbine bladeTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 10700, p 10700 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	digital shearography spatial phase shift temporal phase shift non-destructive testing wind turbine blade Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	digital shearography spatial phase shift temporal phase shift non-destructive testing wind turbine blade Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Zhiyao Li Mohammad Osman Tokhi Ryan Marks Haitao Zheng Zhanfang Zhao Dynamic Wind Turbine Blade Inspection Using Micro-Polarisation Spatial Phase Shift Digital Shearography
description	Shearography, as a novel non-destructive evaluation technique, has shown notable ability in the detection of composite materials. However, in current shearography practices, the phase shifting and loading methods applied are mainly static. For instance, vacuum hood or force loading facilities are often used in phase-shifting shearography, and these are hard to realise with robotic control, especially for on-board inspection. In this study, a dynamic process for detecting defects in the subsurface of a wind turbine blade (WTB) using spatial phase shift with dynamic thermal loading was proposed. The WTB sample underwent a dynamic thermal loading operation, and its status is captured by a Michelson interferometric-based spatial phase shift digital shearography system using a pixelated micro-polarisation array sensor. The captured images were analysed in a 2D frequency domain and low-pass filtered for phase map acquisition. The initial phase maps underwent a window Fourier filtering process and were integrated to produce a video sequence for realisation of visualising the first derivative of the displacement in the process of thermal loading. The approach was tested in experimental settings and the results obtained were presented and discussed. A comparative assessment of the approach with shearography fringe pattern analysis and temporal phase shift technique is also presented and discussed.
format	article
author	Zhiyao Li Mohammad Osman Tokhi Ryan Marks Haitao Zheng Zhanfang Zhao
author_facet	Zhiyao Li Mohammad Osman Tokhi Ryan Marks Haitao Zheng Zhanfang Zhao
author_sort	Zhiyao Li
title	Dynamic Wind Turbine Blade Inspection Using Micro-Polarisation Spatial Phase Shift Digital Shearography
title_short	Dynamic Wind Turbine Blade Inspection Using Micro-Polarisation Spatial Phase Shift Digital Shearography
title_full	Dynamic Wind Turbine Blade Inspection Using Micro-Polarisation Spatial Phase Shift Digital Shearography
title_fullStr	Dynamic Wind Turbine Blade Inspection Using Micro-Polarisation Spatial Phase Shift Digital Shearography
title_full_unstemmed	Dynamic Wind Turbine Blade Inspection Using Micro-Polarisation Spatial Phase Shift Digital Shearography
title_sort	dynamic wind turbine blade inspection using micro-polarisation spatial phase shift digital shearography
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/c1aee3913d134a0cb90faf73fae10929
work_keys_str_mv	AT zhiyaoli dynamicwindturbinebladeinspectionusingmicropolarisationspatialphaseshiftdigitalshearography AT mohammadosmantokhi dynamicwindturbinebladeinspectionusingmicropolarisationspatialphaseshiftdigitalshearography AT ryanmarks dynamicwindturbinebladeinspectionusingmicropolarisationspatialphaseshiftdigitalshearography AT haitaozheng dynamicwindturbinebladeinspectionusingmicropolarisationspatialphaseshiftdigitalshearography AT zhanfangzhao dynamicwindturbinebladeinspectionusingmicropolarisationspatialphaseshiftdigitalshearography
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Dynamic Wind Turbine Blade Inspection Using Micro-Polarisation Spatial Phase Shift Digital Shearography

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