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Reconstruction of Metal Defect Images Based on the Sensitivity Matrix of High Conductivity Initial Estimate for Eddy Current Tomography

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Publicado en:Journal of Nondestructive Evaluation vol. 43, no. 2 (Jun 2024), p. 51
Autor principal: Xiao, Zhili
Otros Autores: Ma, Zicheng, Li, Xiaohui, Tan, Chao, Dong, Feng
Publicado:
Springer Nature B.V.
Materias:
Aircraft
Simulation
Regularization
Linearization
Tomography
Metal plates
Nondestructive testing
Defects
Image reconstruction
Inverse problems
Magnetic fields
Electric fields
Sensors
Airplane engines
Regularization methods
Eddy current testing
Forward problem
Titanium
Acceso en línea:Citation/Abstract
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Resumen:Eddy current testing is one of the conventional non-destructive testing (NDT) technologies which is widely used in metal defects detection. Defect imaging by eddy current tomography (ECT) has advantages of visualization of defects, large detection area, fast detection speed and avoiding mechanical scanning imaging error. Sensitivity matrix is crucial in reconstructing defect images of metal materials by ECT. This article presents a sensitivity matrix of high conductivity initial estimate for ECT detecting metal materials. A 4×<inline-graphic specific-use="web" mime-subtype="GIF" xlink:href="10921_2024_1078_Article_IEq1.gif" />4 eddy current planar coil array and a 2&#xa0;mm thickness titanium plate with defects were designed by both simulation and experiment. Based on the proposed sensitivity matrix, reliability of ECT forward problem linearization was analyzed and image reconstruction with two typical regularization methods (L1<inline-graphic specific-use="web" mime-subtype="GIF" xlink:href="10921_2024_1078_Article_IEq2.gif" /> and L2<inline-graphic specific-use="web" mime-subtype="GIF" xlink:href="10921_2024_1078_Article_IEq3.gif" />) were investigated. Both simulation and experiment results show that ECT forward problem linearization was more accurate and reliable with the proposed sensitivity matrix especially at higher frequency. And L1<inline-graphic specific-use="web" mime-subtype="GIF" xlink:href="10921_2024_1078_Article_IEq4.gif" /> regularization method was verified to be more suitable to reconstruct image of small defects in metal materials. This work expands the original assumption of ECT forward problem linearization, which is of great significance to improve the metal defect image accuracy of ECT.
ISSN:0195-9298
1573-4862
DOI:10.1007/s10921-024-01078-5
Fuente:Materials Science Database