169503 20260302165029.0 doi 10.1088/0957-0233/25/11/115602 sideral 100166 ART-2014-100166 eng Celorrio, R. Universidad de Zaragoza (orcid)0000-0003-2183-2159 Vertical cracks characterization using lock-in thermography: II Finite cracks 2014 The aim of this work is to characterize vertical cracks of finite size and arbitrary shape using optically excited lock-in thermography. In the first place, we have solved the direct problem, which consists of calculating the surface temperature distribution when the shape, size and width of the vertical crack are known. To do this we have developed a new method based on discontinuous finite elements, which allows one to deal even with very narrow cracks, for which classical finite element methods fail. The surface temperature of steel samples containing semi-infinite cracks and illuminated with a laser beam focused close to the crack has been measured using a lock-in thermography setup. A least square fit of the amplitude and phase of the surface temperature is used to retrieve the width and depth of the semi-infinite crack. A very good agreement between the nominal and retrieved values of both parameters is found, confirming the validity of the model. Access copy available to the general public Unrestricted info:eu-repo/semantics/openAccess by-nc-nd https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es 1.433 2014 INSTRUMENTS & INSTRUMENTATION 25 / 56 = 0.446 2014 Q2 T2 ENGINEERING, MULTIDISCIPLINARY 23 / 85 = 0.271 2014 Q2 T1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Omella, A. J. Universidad de Zaragoza (orcid)0000-0002-3143-9097 Pech-May, N. Oleaga, A. Mendioroz, A. Salazar, A. 2005 595 Universidad de Zaragoza Dpto. Matemática Aplicada Área Matemática Aplicada 2005 X Universidad de Zaragoza Dpto. Matemática Aplicada Proy. investigación HMA 25, 11 (2014), - Meas. sci. technol. MEASUREMENT SCIENCE & TECHNOLOGY 0957-0233 1369174 http://zaguan.unizar.es/record/169503/files/texto_completo.pdf Postprint 1405629 http://zaguan.unizar.es/record/169503/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:169503 articulos driver 2026-03-02-14:48:00 ARTICLE