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dc.contributor.authorShandiz, Heydar T.es_ES
dc.contributor.authorGaydecki, Patrickes_ES
dc.date.accessioned2007-06-04T22:33:42Zes_ES
dc.date.accessioned2010-09-07T17:59:48Zes_ES
dc.date.accessioned2011-03-10T17:34:37Z-
dc.date.available2007-06-04T22:33:42Zes_ES
dc.date.available2010-09-07T17:59:48Zes_ES
dc.date.available2011-03-10T17:34:37Z-
dc.date.issued2000-06es_ES
dc.identifier.urihttp://bibdigital.epn.edu.ec/handle/15000/9781es_ES
dc.description.abstractThe Synthetic Aperture Focusing Technique (SAFT) is well established for ultrasonic imaging purposes, for example in nondestructive testing (NDT) of materials. The ultrasonic inspection of concrete is notoriously difficult however, due to its combined attenuating and scattering characteristics, especially at high frequencies. Since low frequency transducers must be used, inspection has traditionally been limited to rather simple measurements conducted in the time domain, such as the ultrasonic pulse velocity. Since the propagation velocity is related to the modulus and density, and hence indirectly to the strength of concrete, the pulse-velocity method has been established as possibly the only standard technique of nondestructive testing of concrete. It is of limited value when attempting to establish the internal condition of the material. For cases where the interrogation frequency is very low (below 250kHz), normally the transducers do not have a broadband frequency response, which causes prolonged ringing in the time domain. Recently however, advances in transducer technology and signal processing have enabled the direct visualization of internal defects both by using pulse-echo systems and SAFT the development and application of an enhanced time-domain SAFT algorithm that uses a correlation technique to perform the coherence summation. Not only is this method faster, by an order of magnitude, than equivalent time-domain SAFT algorithms, it produces images of defects within the concrete that are unobtainable by other means of processing the ultrasonic signals.es_ES
dc.language.isoenges_ES
dc.rightsopenAccess-
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/-
dc.subjectPROCESAMIENTO DE IMÁGENESes_ES
dc.subjectRECONSTRUCCIÓN DE IMÁGENESes_ES
dc.subjectULTRASONIDOes_ES
dc.subject.otherIMAGE PROCESSINGes_ES
dc.subject.otherIMAGE RECONSTRUCTIONes_ES
dc.subject.otherULTRASOUNDes_ES
dc.titleUsing Image Processing and A new SAFT Algorithm for Ultrasonic Flaw Imaging in Concretees_ES
dc.typeArticlees_ES
Aparece en las colecciones:2000 Anales de las XVIII Jornadas en Ingeniería Eléctrica y Electrónica (2000 J - FIEE)

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