| Resumo: | Active lnfrared Thermography techniques are based in detecting thermal waves previously induced in a material. This thermal waves wi ll travel through the material and carry with them information of the interna! structure of the material. Measuring the surface temperature allows to obtain that information . In infrared thermography the surface temperature is meas u red by means of an infrared camera.During the last years these techniques have had a great development because they are very fast techniques , because no contact to the material is needed and because they can be classified as non-destructive techniques.In this work, we will see some examples of active infrared thermography such as pulsed infrared thermography, modulated infrared thermography and vibrothermography.; Terrnografia infragorri aktiboaren oi narria material batean induzitzen diren uhin termjkoen detekzioan datza. Uhin termiko horiek materialean zehar hedatuko dira eta materialaren propietate termikoei eta barne-egiturari buruzko informazioa garraiatuko dute; materialaren gainazalean tenperatura neurtuz lar daiteke informazio hori. Termografia infragorrian tenperatura kamara infragorri baten bitartez neurtzen da.Azken urteetan teknika fototermikoek eta, bereziki, termografia infragorriak garapen handia izan dute, materialak karakterizatzeko teknika azkarrak direlako, laginarekin kontakturik behar ez dutelako eta entsegu ez-suntsi tzaileen harnean sailka daitezkeelako.Lan honetan, termografia infragorri aktiboaren oinarriak ikusiko ditugu eta zenbait aplikaz io aztertuko ditugu hiru teknika erabiliz: termografia infragorri pultsatua, termografia infragorri modulatua eta bibrotermografia.
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