THE CHARACTERIZATION OF CRACK-LIKE DEFECTS USING ULTRASONIC IMAGES

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

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Abstract

The use of ultrasonic arrays to image and size crack-like defects is an important area in non-destructive evaluation. The features in the ultrasonic data from a crack-like defect provide information about the size and orientation angle of the defect. In this paper, the characteristics of a crack-like defect were measured from its scattering coefficient matrix, when the angular coverage of measurement includes the specular regions of its scattering matrix. Alternatively, the imaged features for a large crack-like defect (its length more than two wavelengths) were directly used to characterize the defect through a rectangular box fitting approach. An efficient hybrid model was used to generate the full matrix of array data from samples with a defect and for a specified inspection configuration. This hybrid model combines far-field scattering coefficient matrix for defects with a ray based forward model. This model offers the potential to compile a look-up table through which defects can be classified and then sized. Good agreement was achieved between simulation and experimental results hence validating this model based approach.

Original languageEnglish
Title of host publicationREVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLS 29A AND 29B
EditorsDO Thompson, DE Chimenti
Place of PublicationMELVILLE
PublisherAmerican Institute of Physics (AIP)
Pages895-902
Number of pages8
ISBN (Print)978-0-7354-0748-0
Publication statusPublished - 2010
Event36th Annual Review of Progress in Quantitative Nondestructive Evaluation - Kingston, Jamaica
Duration: 26 Jul 200931 Jul 2009

Conference

Conference36th Annual Review of Progress in Quantitative Nondestructive Evaluation
CountryJamaica
CityKingston
Period26/07/0931/07/09

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