Rotating field eddy current probe with bobbin pickup coil for steam generator tubes inspection

Xin, Junjun; Lei, Naiguang; Удпа, Лалита; Удпа, Сатиш С.

doi:10.1016/j.ndteint.2012.12.002

Cited by 53 publications

(22 citation statements)

References 7 publications

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“…ECT is also used to evaluate defects in various other environments and configurations [14]. These include flaws in steam generator tubes [18][19][20][21][22][23], fatigue cracks [24][25][26], corrosion [27][28][29][30][31][32][33], material microstructure near welds [34], and estimation of pearlite percentages in plain carbon steels [35,36] and in cast irons [37]. High density eddy current C-Scan data has also been used for the analysis of bolt hole eddy current [38] and estimation of micro-crack lengths [39].…”

Section: Introductionmentioning

confidence: 99%

Surface Profiling and Core Evaluation of Aluminum Honeycomb Sandwich Aircraft Panels Using Multi-Frequency Eddy Current Testing

Reyno¹,

Underhill²,

Krause³

et al. 2017

Preprint

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Surface damage on honeycomb aircraft panels is often measured manually, and is therefore subject to variation based on inspection personnel. Eddy current testing (ECT) is sensitive to variations in probe-to-specimen spacing, or lift-off, and is thus promising for high resolution profiling of surface damage on aluminum panels. Lower frequency testing also allows inspection through the face sheet, an advantage over optical 3D scanning methods. This paper presents results from the ECT inspection of surface damage on an approximately flat aluminum honeycomb aircraft panel, and compares the measurements to those taken using optical 3D scanning technology. An ECT C-Scan of the dented panel surface was obtained by attaching the probe to a robotic scanning apparatus. Data was taken simultaneously at four frequencies of 25, 100, 400 and 1,600 kHz. A reference surface was then defined that approximated the original, undamaged panel surface, which also compensated for the effects of specimen tilt and thermal drift within the ECT instrument. Data was converted to lift-off using height calibration curves developed for each probe frequency. A damage region of 22,550 mm 2 area with dents ranging in depth from 0.13-1.01 mm was analyzed. The method was accurate at 1,600 kHz to within 0.05 mm (2σ) when compared with 231 measurements taken via optical 3D scanning. Testing at 25 kHz revealed a 3.2 mm cell size within the honeycomb core, which was confirmed via destructive evaluation. As a result, ECT demonstrates potential for implementation as a method for rapid in-field aircraft panel surface damage assessment.

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Section: Introductionmentioning

confidence: 99%

Surface Profiling and Core Evaluation of Aluminum Honeycomb Sandwich Aircraft Panels Using Multi-Frequency Eddy Current Testing

Reyno¹,

Underhill²,

Krause³

et al. 2017

Preprint

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“…Finite element method is proved to be an effective analysis method for eddy current NDT [4] [5] [6], and is adopted to analyze the internal mechanism of poor sensitivity to axial crack rather than defects in other direction.…”

Section: Finite Element Simulation and Analysismentioning

confidence: 99%

Research on Novel Remote Field Eddy Current Testing System for Axial Crack Detection with High Resolution

Xu¹

2015

Proceedings of the 2015 International Conference on Industrial Technology and Management Science

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“…The sizing accuracy and the probability of detection for Eddy current probes were dependent on the location and orientation of the defects and the artifacts such as corrosion deposits and tube support structures [19]. A rotating field Eddy current probe with bobbin pickup coil was developed by Xin et al [20]. Meanwhile, Li et al [21] proposed the array probe which consists of multiple coils arranged around the circumference of the probe in addition to a standard bobbin coil probe.…”

Section: Steam Generator Tubesmentioning

confidence: 99%

“…The fast crack profile reconstruction methods using transient time and spectral components of PEC signals were carried out on EDM slots of 3 mm, 4 mm, 6 mm, 6 Advances in Mechanical Engineering [18][19][20][21][22][23] E m p l o y e d E C p r o b e s [27] EC probe mounted in a planar probe [28] Optimized EC array technique Fatigue crack [51] EC with operating frequency range between 200 Hz and 100 kHz [52] A uniform EC probe with 23 arrayed detectors [53] I n d u c t i o n P E C T [2,54,55] Eddy current [56] EC with an array probe [57] EC-giant magnetoresistive (EC-GMR) sensor system Corrosion [47,[58][59][60][61][62]71] Eddy current [63,72] P E C [66] Electromagnetic acoustic transducer-Eddy current (EMAT-EC) dual probe Material microstructure [67] Eddy current Estimation of pearlite [68][69][70] Eddy current and 8 mm depth [77]. The method provided initial approximate profiles for crack shape reconstruction using different PEC signals such as amplitude, phase, real and imaginary values of spectral components, and transient slices using reconstruction mean square errors (MSE) which reduces the computing time.…”

Section: Pulsed Eddy Current (Pec)mentioning

confidence: 99%

Defect Characterization Based on Eddy Current Technique: Technical Review

Ghoni

Dollah

Sulaiman

et al. 2014

Advances in Mechanical Engineering

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Eddy current testing is widely used for nondestructive evaluation of metallic structures in characterizing numerous types of defects occurring in various locations. It offers remarkable advantages over other nondestructive techniques because of its ease of implementation. This paper presents a technical review of Eddy current technique in various scope of defect detection. The first part presents Eddy current evaluation on various defects location and orientation such as steam generator tubes, stress crack corrosion, and fatigue cracks. The next section analyzes the use of pulsed Eddy current and pulsed Eddy current thermography as an alternative method for monitoring the growth of cracks with the aid of computational techniques for postsignal analysis.

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Rotating field eddy current probe with bobbin pickup coil for steam generator tubes inspection

Cited by 53 publications

References 7 publications

Surface Profiling and Core Evaluation of Aluminum Honeycomb Sandwich Aircraft Panels Using Multi-Frequency Eddy Current Testing

Surface Profiling and Core Evaluation of Aluminum Honeycomb Sandwich Aircraft Panels Using Multi-Frequency Eddy Current Testing

Research on Novel Remote Field Eddy Current Testing System for Axial Crack Detection with High Resolution

Defect Characterization Based on Eddy Current Technique: Technical Review

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