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Title

On the use of the non-stationarity of the structural noise for defect visibility enhnacement in ultrasonic inspections

AuthorsIzquierdo, M. A. G.; Hernández, M. G.; Molero Armenta, Miguel Ángel; Anaya Velayos, José Javier
KeywordsUltrasonic imaging and detection
Signal processing
Structural noise
Ultrasonic inspections
Flaw visibility enhancement
Issue DateDec-2007
PublisherSociedad Española de Acústica
CitationXIX Congreso Internacional de Acústica (ICA2007)
SeriesICA2007
ULT-10-003-IP
AbstractStructural noise is an important distortion source in ultrasonic images of highly dispersive materials. This noise can considerably mask the flaw signals and cannot be eliminated using standard techniques for noise cancelling like band-pass filtering or temporal averaging. Fortunately, this noise has several characteristics that may help an algorithm designer to develop methods that improve the defect visibility.
In the literature there exist many techniques for flaw visibility enhancement in the presence of structural noise. However, many of the proposed algorithms do not systematic exploit the above mentioned characteristics. In this work we analyze the structural noise from a point of view of an algorithm developer that seeks parameters that may help to eliminate the noise enhancing the defect visibility. Also, we present several algorithms examples that, using this information, dramatically improve the visibility of the flaw echoes.
DescriptionPonencia presentada en el XIX Congreso Internacional de Acústica (ICA2007), Madrid, 2-7 Sep 2007.-- PACS: 43.60.Hj.
URIhttp://hdl.handle.net/10261/5327
Appears in Collections:(IAI) Comunicaciones congresos
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