Experimental study of a thin thermally grown oxide layer in thermal barrier coatings based on the SWT-BP algorithm and terahertz technology - Details

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As　a　promising　nondestructive　testing　(NDT)　technique　with　a　very　adaptive　physical　modeling　of　wave　transmission　process,　terahertz　technology　is　used　for　the　detection　and　characterization　of　nonpolar　materials　and　the　evaluation　of　layered　and/or　defective　structures.　THz-TDS　can　also　be　used　to　perform　spectroscopic　analysis　and　detect　structural　defects　in　thermal　barrier　coatings　(TBCs)　of　aero-engines.　Although　it　is　generally　difficult　to　measure　the　structure　of　the　thin　oxide　layer　of　the　thermal　barrier　coatings　whose　thickness　is　generally　lower　than　30　µm　(the　current　axial　resolution　of　the　THz-TDS　cannot　exceed　30　µm).　We　were　able　to　complete　the　detection　of　the　oxide　layer　within　1–29　µm　through　simulation　by　using　the　SWT-BP　algorithm.　In　this　study,　the　analysis　was　performed　on　real-world　samples,　the　fitting　degree　of　the　SWT-BP　algorithm　reached　0.77,　and　the　minimum　prediction　error　was　less　than　0.1　µm.　The　paper　also　put　forward　some　improvement　measures　about　the　experimental　results.　©　2024　Optica　Publishing　Group　©　2024　Optica　Publishing　Group　(formerly　OSA).　All　rights　reserved.

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[ 1 ] [Luo M.]School of Mechanical Electrical and Information Engineering, Putian University, Putian, 351100, China
[ 2 ] [Zhong S.]School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou, 350108, China
[ 3 ] [Zhong S.]Fujian Provincial Key Laboratory of Terahertz Functional Devices and Intelligent Sensing, Fuzhou University, Fuzhou, 350108, China
[ 4 ] [Huang Y.]School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou, 350108, China
[ 5 ] [Huang Y.]Fujian Provincial Key Laboratory of Terahertz Functional Devices and Intelligent Sensing, Fuzhou University, Fuzhou, 350108, China
[ 6 ] [Zhang Z.]School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou, 350108, China
[ 7 ] [Zhang Z.]Fujian Provincial Key Laboratory of Terahertz Functional Devices and Intelligent Sensing, Fuzhou University, Fuzhou, 350108, China
[ 8 ] [Nsengiyumva W.]School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou, 350108, China
[ 9 ] [Nsengiyumva W.]Fujian Provincial Key Laboratory of Terahertz Functional Devices and Intelligent Sensing, Fuzhou University, Fuzhou, 350108, China
[ 10 ] [Tu W.]Marine Engineering Institute, Jimei University, Xiamen, 361021, China

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Applied Optics

ISSN： 1559-128X

Year： 2024

Issue： 13

Volume： 63

Page： 3430-3437

1 . 7 0 0

JCR@2023

CAS Journal Grade：4

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