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1
Review paper: Application of the Pulsed Eddy Current Technique to Inspect Pipelines of Nuclear Plants

D. G. Park,C. S. Angani,M. B. Kishore,G. Vertesy,D. H. Lee 한국자기학회 2013 Journal of Magnetics Vol.18 No.3
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Local wall thinning in pipelines affects the structural integrity of industries, such as nuclear power plants (NPPs). In the present study, a development of pulsed eddy current (PEC) technology that detects the wall thinning of pipelines covered with insulation is reviewed. The methods and experimental results, which have two kinds of probe with a single and double core, were compared. For this purpose, the single and double core probes having one and two excitation coils have been devised, and the differential probe with two Hall sensors has been fabricated to measure the wall thinning in insulated pipelines. The test sample is a stainless steel having different thickness, laminated by plastic insulation to simulate the pipelines in NPPs. The excitation coils in the probe is driven by a rectangular current pulse, the difference of two Hall sensors has been measured as a resultant PEC signal. The peak value of the detected signal is used to describe the wall thinning. The double core probe has better performance to detect the wall thinning covered with insulation; the single core probe can detect the wall thinning up to an insulation thickness of 18 mm, whereas the double probe can detect up to 25 mm. The results show that the double core PEC probe has the potential to detect the wall thinning in an insulated pipeline of the NPPs
2
A study of microstructural analysis for nondestructive evaluation of thermal annealing using magnetic properties

Park, D.G.,Kishore, M.B.,Lee, D.H.,Kim, J.Y.,Jacobs, L.J.,Vertesy, G.,Son, Derac BUTTERWORTH-HEINEMANN 2017 NDT AND E INTERNATIONAL Vol.89 No.-
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<P>Two kinds of thermally aged Fe-Cu alloys with different Cu proportions 0.05% and 0.45% were prepared and their magnetic properties were investigated to apply magnetic nondestructive testing techniques for the assessment of irradiation embrittlement of materials. Initially, the alloy is 10% cold rolled and then isothermally aged at 500 degrees C and 400 degrees C with different aging time up to 1000 h in order to create Cu-precipitates in the Fe metal matrix. The hysteresis loop (HL), Barkhausen noise (BN) and Magnetic Adaptive Testing (MAT) parameter were measured for magnetic properties studies and mechanical properties were investigated by Vickers hardness. The HL, BN were decreased and the MAT parameter was increased by thermal aging. The changes of these parameters were explained by copper rich precipitations (CRPs) formation, interaction with domain walls and dislocation movement pinned by CRPs. It was confirmed by TEM and EDX analysis.</P>
3
Photonic crystal type structures of biological origin: Structural and spectral characterization

K. Kertesz,Zs. Balint,Z. Vertesy,G.I. Mark,V. Lousse,J.-P. Vigneron,L.P. Biro 한국물리학회 2006 Current Applied Physics Vol.6 No.2
Photonic crystal type structures of biological origin were investigated by scanning electron microscopy (SEM) and UVVISreectance measurements. It was demonstrated that despite the moderate refractive index contrast between chitin and air, biologicalevolution developed in the wing scale nanostructures of butteries representing various families, numerous structures with dierentuse photonic structures, the UV protection mechanism of the high altitude ower Edelweiss has been investigated. We present fullysupportive data that the protection mechanism is based on coupling by nanostructured, highly selective couplers the harmful UVradiation in propagating modes along bers containing UV absorbing pigment.