Inverse wave field extrapolation: a different NDI approach to imaging defects

Nondestructive inspection (NDI) based on ultrasound is widely used. A relatively recent development for industrial applications is the use of ultrasonic array technology. Here, ultrasonic beams generated by array transducers are controlled by a computer. This makes the use of arrays more flexible th...

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Bibliographic Details
Published in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 2007-01, Vol.54 (1), p.118-127
Main Authors: Portzgen, N., Gisolf, D., Blacquiere, G.
Format: Article
Language:English
Subjects:
Acoustics
Algorithms
Application software
Arrays
Computer simulation
Defects
Exact sciences and technology
Extrapolation
Finite difference methods
Fundamental areas of phenomenology (including applications)
General equipment and techniques
Image Enhancement - methods
Image Interpretation, Computer-Assisted - methods
Imaging
Information Storage and Retrieval - methods
Inspection
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Manufactured Materials - analysis
Materials Testing - methods
Nondestructive testing
Numerical Analysis, Computer-Assisted
Petroleum
Physics
Reproducibility of Results
Seismic measurements
Seismic phenomena
Sensitivity and Specificity
Studies
Thickness measurement
Transducers
Ultrasonic imaging
Ultrasonic transducer arrays
Ultrasonic transducers
Ultrasonics, quantum acoustics, and physical effects of sound
Ultrasonography - methods
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Summary:Nondestructive inspection (NDI) based on ultrasound is widely used. A relatively recent development for industrial applications is the use of ultrasonic array technology. Here, ultrasonic beams generated by array transducers are controlled by a computer. This makes the use of arrays more flexible than conventional single-element transducers. However, the inspection techniques have principally remained unchanged. As a consequence, the properties of these techniques, as far as characterization and sizing are concerned, have not improved. For further improvement, in this paper we apply imaging theory developed for seismic exploration of oil and gas fields on the NDI application. Synthetic data obtained from finite difference simulations is used to illustrate the principle of imaging. Measured data is obtained with a 64-element linear array (4 MHz) on a 20-mm thick steel block with a bore hole to illustrate the imaging approach. Furthermore, three examples of real data are presented, representing a lack of fusion defect, a surface breaking crack, and porosity
ISSN:0885-3010
1525-8955
DOI:10.1109/TUFFC.2007.217