Application of Model-Based Inversion to Eddy-Current Nde of Heat-Exchanger Tubing

Sabbagh, Harold A.; Aldrin, John C.; Murphy, R. Kim; Sabbagh, Elias H.

doi:10.1063/1.3114329

Cited by 3 publications

(6 citation statements)

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“…The computational tool that was use to perform model-based inversion is nonlinear, least-squares estimation [11]. Since the data were acquired using a constant rate of acquisition (1000 Hz), it was observed that the pull velocity of the probe through the tube actually varied by as much as 30% with respect to the mean rate.…”

Section: Problem Approachmentioning

confidence: 99%

“…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]. Prior work has demonstrated the potential to characterize surface and sub-surface pitting corrosion in both aircraft structures and tubing through the application of modelbased inversion schemes to eddy current inspection data [10][11]. However, there has been limited progress to transition such technologies to application due in part to questions about the robustness of the inverse method schemes to the expected variability with in-field NDE measurements.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Problem Approachmentioning

confidence: 99%

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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“…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%

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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“…For inspection data interpretation many theoretical and experimental investigations were carried out (Ida, 1986;Pichenot et al, 2004). In another investigations special algorithms, based on feature extraction, neural network, etc, were proposed (Wong et al, 1995;Song et al, 2003;Sabbagh et al, 2008;Nam et al, 2009). But the mentioned results were obtained mostly for SG tubes of another types then used at WWER type NPP.…”

Section: State Of the Artmentioning

confidence: 99%

“…The defect is located in the tube so that its midpoint corresponds to X coordinate zero point. The EC probe signal responses were determined by the volume integral method application (Dunbar, 1985;Sabbagh et al, 2008). There were calculated the changes in the real D X and imaginary D R components of the EC probe impedance D Z as well as signal response amplitude Mod Z D at operational frequency 100 kHz in the course of EC probe scanning along the tube (the X coordinate was varied by 1 mm within the range ± 10 mm) from cracks of different length cr l , located symmetrically with respect to the X coordinate zero point (Fig.…”

Section: Rotating Probementioning

confidence: 99%