Wavelet-based permeability compensation technique for characterizing magnetic flux leakage images

Mandayam, Shreekanth; Удпа, Лалита; Удпа, Сатиш С.; Lord, W.

doi:10.1016/s0963-8695(96)00075-8

Cited by 21 publications

(9 citation statements)

References 7 publications

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“…Since early 1990s, Udpa’s Materials Assessment group at Iowa State University (now Nondestructive Evaluation Laboratory at Michigan State University) were one of the pioneering groups in the US conducting MFL inspection and imaging research [ 7 – 10 ].…”

Section: Techniques Based On Different Electromagnetic Frequenciesmentioning

confidence: 99%

“…Mandayam and Udpa developed several novel but general techniques for deriving selective image invariants and performing invariance transformations to compensate for such variations. For example, wavelet basis functions can be used and typical magnetic flux leakage images obtained from finite element (FE) simulation of the pipeline inspection process are presented in their paper [ 7 ].…”

Section: Techniques Based On Different Electromagnetic Frequenciesmentioning

confidence: 99%

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Electromagnetic Imaging Methods for Nondestructive Evaluation Applications

Deng

Liu

2011

Sensors

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Electromagnetic nondestructive tests are important and widely used within the field of nondestructive evaluation (NDE). The recent advances in sensing technology, hardware and software development dedicated to imaging and image processing, and material sciences have greatly expanded the application fields, sophisticated the systems design and made the potential of electromagnetic NDE imaging seemingly unlimited. This review provides a comprehensive summary of research works on electromagnetic imaging methods for NDE applications, followed by the summary and discussions on future directions.

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Section: Techniques Based On Different Electromagnetic Frequenciesmentioning

confidence: 99%

Section: Techniques Based On Different Electromagnetic Frequenciesmentioning

confidence: 99%

Electromagnetic Imaging Methods for Nondestructive Evaluation Applications

Deng

Liu

2011

Sensors

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“…The WBF network architecture is similar to that of the MLP network and it uses wavelets for functional approximation and can be expressed using Equation (1) [7].…”

Section: Characterization Of Mechanical Damagementioning

confidence: 99%

Characterization of Mechanical Damage in Gas Transmission Pipelines

Kamat

Yeoh

Ivanov

et al. 1998

Review of Progress in Quantitative Nondestructive Evaluation

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“…Nondestructive testing (NDT) techniques are often used in SHM. The most commonly used NDT methods like X-ray [1] , eddy current [2] and magnetic flux [3] methods can also be used in cylindrical structure health monitoring. But because of their point-to-point inspection scheme and human efforts involved during inspection, such methods cannot be cost effective when applied widely on structures that cover large areas such as pipelines.…”

Section: Introductionmentioning

confidence: 99%

Detection and monitoring of axial cracks on cylindrical structures using torsional wave generated by piezoelectric macro-fiber composite

et al. 2012

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In cylindrical structures such as pipelines and pressure vessels, cracks are most likely to occur along the longitudinal (axial) direction and they can be fatal to the serviceability of the structures. Unfortunately, the conventional ultrasonic crack detection techniques, which usually use longitudinal wave, are not very sensitive to this type of cracks. This paper focuses on the detection and monitoring of axial cracks in cylindrical structures using torsional wave generated by piezoelectric macro-fiber composite (MFC). The first order torsional wave is a kind of non-dispersive pure shear wave which propagates at a fixed wave speed. Torsional wave is utilized in this work because, intuitively, it is more sensitive to axial cracks than the family of longitudinal waves. Numerical simulation has been performed using ANSYS to show the effectiveness of torsional wave in detecting and monitoring axial cracks. The time of flight (TOF) of the waves is used to determine the crack position, while the crack propagation is monitored by measuring the variation in the crack induced disturbances. Experiments have also been conducted to investigate the feasibility of the proposed method. MFC transducers oriented at 45˚ against the axis of the specimen are used to generate and receive torsional waves. The experimental results demonstrated that the crack position can be indentified and its growth can be well monitored with the presented approach using torsional wave.

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Wavelet-based permeability compensation technique for characterizing magnetic flux leakage images

Cited by 21 publications

References 7 publications

Electromagnetic Imaging Methods for Nondestructive Evaluation Applications

Electromagnetic Imaging Methods for Nondestructive Evaluation Applications

Characterization of Mechanical Damage in Gas Transmission Pipelines

Detection and monitoring of axial cracks on cylindrical structures using torsional wave generated by piezoelectric macro-fiber composite

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