169493 20260302165029.0 doi 10.1088/0957-0233/25/11/115601 sideral 91883 ART-2014-91883 eng Pech-May,N. W. Vertical cracks characterization using lock-in thermography: I infinite cracks 2014 Early detection of cracks is a challenging task to prevent failures in working structures. In the last decades the ‘flying spot’ method, based on heating the sample with a moving laser spot and detecting the surface temperature with an infrared detector, has been developed to detect cracks in a fast manner. The aim of this work is to measure the width of an infinite vertical crack using lock-in thermography. An analytical solution for the surface temperature of a sample containing such a crack when the surface is illuminated by a modulated laser beam focused at a fixed spot close to the crack is obtained. Measurements on samples containing calibrated cracks have been performed using an infrared camera. A least square fit of the amplitude and phase of the surface temperature is used to retrieve the thickness of the crack. A very good agreement between the nominal and retrieved thicknesses of fissure is found, even for widths down to 1 µm, 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 Oleaga, A Mendioroz, A Omella, A. J. Universidad de Zaragoza (orcid)0000-0002-3143-9097 Celorrio, R. Universidad de Zaragoza (orcid)0000-0003-2183-2159 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), 115601 [11 pp.] Meas. sci. technol. MEASUREMENT SCIENCE & TECHNOLOGY 0957-0233 1522204 http://zaguan.unizar.es/record/169493/files/texto_completo.pdf Postprint 1413094 http://zaguan.unizar.es/record/169493/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:169493 articulos driver 2026-03-02-14:47:46 ARTICLE