Investigations on imaging and sizing of defects using ultrasonic phased array and the synthetic aperture focusing technique
The study aims at investigating the imaging and sizing capabilities of ultrasonic phased arrays and the synthetic aperture focusing technique (SAFT) of surface-breaking defects in a carbon steel plate. The defects were imaged using a phased array transducer and the relative arrival
time technique (RATT) was used to size the defects. Studies were carried out to size near-through-wall defects so as to estimate the largest size of defect that can be accurately sized in accordance with the leak before break (LBB) criterion in critical applications. Additionally, the study
also aims at sizing the smallest defect that can be sized accurately using the two techniques.
The study also shows a direction for improved sizing accuracy of certain defects by means of the hybrid-based genetic algorithm (GA) approach which otherwise was limited by the two imaging techniques.
The study also shows a direction for improved sizing accuracy of certain defects by means of the hybrid-based genetic algorithm (GA) approach which otherwise was limited by the two imaging techniques.
Keywords: defect sizing; genetic algorithm; near-through-wall cracks; phased array; relative arrival time technique; synthetic aperture focusing technique
Document Type: Research Article
Affiliations: 1 Centre for Non-Destructive Evaluation and Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai-600 036, India.
Publication date: 01 July 2009
- Official Journal of The British Institute of Non-Destructive Testing - includes original research and development papers, technical and scientific reviews and case studies in the fields of NDT and CM.
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