Some Inversion Problems in Nondestructive Evaluation

Murphy, R. Kim; Sabbagh, Harold A.; Treece, Jeff C.

doi:10.1007/978-1-4615-1987-4_107

Cited by 13 publications

(5 citation statements)

References 3 publications

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“…The liftoff is defined as a uniform random variable with the range of 0.55 +/-0.05 mm as shown in Figure 2(b). VIC-3D® was used to generate the simulated results for the study [3]. The gap between the plates was initially fixed at 0.3 mm and the frequency for the study was set to 4.0 kHz.…”

Section: Case Study Problemmentioning

confidence: 99%

“…Computational methods have been proposed to develop and evaluate NDE inspection systems to address these problems for a few decades. Significant progress has been made in forward modeling, detection theory, and inverse theory [2][3][4]. Although eddy current models can accurately simulate many realistic NDE scenarios, limited progress has been made to implement model-based inverse methods partly due to the wide range of varying conditions under test.…”

Section: Introductionmentioning

confidence: 99%

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Uncertainty Propagation in Eddy Current Nde Inverse Problems

Aldrin¹,

Knopp²,

Blodgett³

et al. 2011

AIP Conference Proceedings

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The probabilistic collocation method (PCM) was introduced to efficiently propagate the distributions of input parameters for eddy current NDE inverse problems. A multilevel approach was also considered to simultaneously address input parameter variability and the uniqueness of the inversion result. A case study is presented for the problem of characterizing material loss in a multi-layer structure with varying liftoff and material properties. The performance and sensitivity of the uncertainty propagation method using PCM was evaluated under varying conditions.

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Section: Case Study Problemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Uncertainty Propagation in Eddy Current Nde Inverse Problems

Aldrin¹,

Knopp²,

Blodgett³

et al. 2011

AIP Conference Proceedings

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“…The theoretical prediction of eddy-current probe output signals for various non-destructive testing applications usually involves the solution of the electromagnetic field problem due to a currentcarrying loop in the vicinity of a flawless conductor. A general solution for this problem can be sought in the use of various numerical techniques, including the finite element method [4], the boundary element method [5] and the volume integral method [6].…”

Section: Introductionmentioning

confidence: 99%

Dimension Estimation of Rectangular Cracks Using Impedance Changes of the Eddy Current Probe with a Neural Network

Babaei¹,

Suratgar²,

Salemi³

2013

Journal of Applied Research and Technology

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In this paper a method for estimating the dimension of rectangular cracks is proposed. The use of Eddy current (EC) nondestructive testing (NDT) based on probe impedance changes on the crack regions is considered. The artificial neural network estimates the dimension of new cracks using impedance changes of the eddy current probe. The experimental results and finite element method (FEM) results are used for training the artificial neural network. By increasing the number of experiments, the results of the finite element method are not necessary. The simulation results are very promising.

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“…Significant research into inverse methods for flaw characterization using eddy current data has been explored [1][2][3][4][5][6]. To date, most efforts have primarily addressed the sizing of surface breaking cracks [1][2][3][4][5][6][7][8], with limited work on the problem of sizing corrosion pits [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Analysis of Inverse Methods in Eddy Current Pit Characterization

Aldrin¹,

Sabbagh²,

Murphy³

et al. 2010

AIP Conference Proceedings

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A sensitivity analysis was performed for a pit characterization problem to quantify the impact of potential sources for variation on the performance of inverse methods. Certain data processing steps, including careful feature extraction, background clutter removal and compensation for variation in the scan step size through the tubing, were found to be critical to achieve good estimates of the pit depth and diameter. Variance studied in model probe dimensions did not adversely affect performance.

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Some Inversion Problems in Nondestructive Evaluation

Cited by 13 publications

References 3 publications

Uncertainty Propagation in Eddy Current Nde Inverse Problems

Uncertainty Propagation in Eddy Current Nde Inverse Problems

Dimension Estimation of Rectangular Cracks Using Impedance Changes of the Eddy Current Probe with a Neural Network

Sensitivity Analysis of Inverse Methods in Eddy Current Pit Characterization

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