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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 g m (the current axial resolution of the THz-TDS cannot exceed 30 g m). We were able to complete the detection of the oxide layer within 1-29 g m 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 g m. The paper also put forward some improvement measures about the experimental results. (c) 2024 Optica Publishing Group
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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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