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EnglishIn this paper, we introduce a method for detecting and characterising infinite vertical cracks in large samples by means of active infrared thermography and flying spot technique. We scan the sample surface by a focused laser spot moving at constant speed, and we measure the temperature at the surface with an infrared camera. The vertical cracks act as a thermal barrier and they create a discontinuity in the surface temperature. Fitting the theoretical model that we have developed to the experimental data, we can characterise the cracks. The model we have developed is valid for a moving laser and, also, for a static laser and a moving sample; the latter is very interesting for in-line characterisation of defects in industry. In this work, we show the work our research group has done in order to characterise vertical cracks and we present some measurements and their results for calibrated samples. EuskaraArtikulu honetan, termografia infragorria aktiboaren bidez, pieza handietako pitzadura bertikalak karakterizatzeko metodo bat aurkeztuko dugu. Metodo honen bidez materialaren gainazala abiadura konstantez mugitzen den laser-sorta batekin argiztatzen dugu eta abiadura handiko kamera infragorri bat erabiliz gainazaleko tenperaturaren aldaketaren garapena neurtzen dugu. Gainazaleko pitzadura bertikalak uhin termikoentzat barrera termiko bat dira eta beraz, gainazaleko tenperaturaren profilean ez-jarraitasun bat sortzen dute. Matematikoki garatutako modelo teorikoa esperimentalki lortutako tenperatura profilarekin doituz pitzaduraren ezaugarriak lor ditzakegu. Garatutako metodoa baliozkoa da laser-sorta mugitu beharrean laserra geldi utzi eta lagina mugitzen dugunean, azken hori interesgarria da ekoizpen-kateetan pitzadurak in situ karakterizatu ahal izateko. Lan honetan beraz, gure ikerkuntza taldeak pitzadura bertikalak karakterizatu ahal izateko jarraitutako ibilbidea azalduko dugu eta lortutako metodoa balioztatzeko kalibratutako laginekin egindako neurketak aurkeztuko ditugu.

Pitzadura bertikalen detekzio eta karakterizazioa termografia infragorria eta laser mugikorra erabiliz