135841 20260217205550.0 doi 10.1016/j.ndteint.2024.103156 sideral 138840 ART-2024-138840 eng Salazar, A. Resolution of multiple semi-infinite delaminations using lock-in infrared thermography 2024 Access copy available to the general public Unrestricted Delaminations are flat subsurface defects parallel to the sample surface. Recently we have demonstrated that lock-in infrared thermography, with optical excitation, allows sizing the geometrical parameters (length, depth and thickness) of a semi-infinite delamination. Here, we analyse the ability of this technique to resolve several parallel and semi-infinite delaminations. First, we develop an analytical method (based on the thermal quadrupoles) together with a numerical formulation to calculate the surface temperature of a sample containing several semi-infinite parallel delaminations. We verify that both methods provide the same temperature values, indicating their consistency. Then, we study the ability of lock-in infrared thermography to resolve two close delaminations. In particular we focus on two main configurations: two non-overshadowed delaminations and two superimposed delaminations. Next, after analysing the inverse problem in terms of residual function minimization, we develop a dedicated parametric estimation procedure able to retrieve the geometry of the studied defects. Finally, we test this procedure with synthetic temperature amplitude and phase data to retrieve the geometrical parameters of both delaminations. info:eu-repo/semantics/openAccess by-nc https://creativecommons.org/licenses/by-nc/4.0/deed.es 4.5 2024 MATERIALS SCIENCE, CHARACTERIZATION & TESTING 5 / 37 = 0.135 2024 Q1 T1 1.091 2024 Condensed Matter Physics 2024 Q1 Mechanical Engineering 2024 Q1 Materials Science (miscellaneous) 2024 Q1 6.8 2024 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Sagarduy-Marcos, D. Rodríguez-Aseguinolaza, J. Mendioroz, A. Ciria, J.C. Universidad de Zaragoza (orcid)0000-0002-0048-3036 Celorrio, R. Universidad de Zaragoza (orcid)0000-0003-2183-2159 2005 595 Universidad de Zaragoza Dpto. Matemática Aplicada Área Matemática Aplicada 5007 075 Universidad de Zaragoza Dpto. Informát.Ingenie.Sistms. Área Ciencia Comput.Intelig.Ar 146 (2024), 103156 [9 pp.] NDT E int. NDT and E International 0963-8695 2422863 http://zaguan.unizar.es/record/135841/files/texto_completo.pdf Versión publicada 2321789 http://zaguan.unizar.es/record/135841/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:135841 articulos driver 2026-02-17-20:40:00 ARTICLE