2010
DOI: 10.1016/j.ndteint.2009.12.003
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Enhancement of ultrasonic images for sizing of defects by time-of-flight diffraction

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Cited by 32 publications
(15 citation statements)
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“…As illustrated in Figure 2, this is achieved using a simple Pythagorean method, where the apparent depth, r, of the current indication, P x,y , is given by Equation (2). P x and P y are the coordinates of the reflector and X n is the location of the transducer along the surface of the material:…”
Section: Forward Modelmentioning
confidence: 99%
See 1 more Smart Citation
“…As illustrated in Figure 2, this is achieved using a simple Pythagorean method, where the apparent depth, r, of the current indication, P x,y , is given by Equation (2). P x and P y are the coordinates of the reflector and X n is the location of the transducer along the surface of the material:…”
Section: Forward Modelmentioning
confidence: 99%
“…The observed signal from an ultrasonic measurement system, y(t), can be expressed as the convolution of the response of the measurement system (wavelet) x(t) with the transfer function of the material h(t), summed with random noise ε(t) [2] :…”
Section: Convolutionmentioning
confidence: 99%
“…Using ultrasonic array imaging methods such as the: total focusing method [1], synthetic aperture focusing technique [2], [3], inverse field wave extrapolation [4] or wavenumber algorithms [5], a range of defects can be detected and accurately located. If the defects are large, i.e.…”
Section: Introductionmentioning
confidence: 99%
“…where, is the mean, the standard deviation, the cross-correlation (inner product) and 1,2,3 are small constants used to avoid numerical instabilities when ( 2 + 2 ) and/or ( 2 + 2 ) and/or ( ) are close to zero. An SSIM of 1 results from two identical images.…”
Section: Introductionmentioning
confidence: 99%
“…However, the probe used has special requirements which are difficult to achieve. Synthesis aperture focused technology (SAFT) was first used for synthesis aperture radar technology to improve the horizontal resolution of radar images, literatures [10][11][12] apply SAFT application in ultrasonic TOFD imaging, and have achieved good research results. However, the limitation of this research is that the longitudinal resolution of SAFT imaging is still low, especially for near surface defects on devices.…”
Section: Introductionmentioning
confidence: 99%