Abstract
Pulsed eddy current is an emerging technique for measuring wall thinning of steel under insulation. Ideally, it would be desirable to obtain the most localised information of pipe condition possible. The localization of information is constrained by the flow of eddy currents in the pipe. This in turn is heavily influenced by the orientation of the probe. This paper examines three different probe orientations, representative of all probe types for their influence on eddy current flow. All three orientations will have difficulty accurately measuring highly localized thinning, because the eddy currents that give rise to their signal spread out rapidly way from the thin region in the long time signal decay. Of the three orientations, the longitudinal one does the best job of localizing the eddy currents directly under the probe.
Similar content being viewed by others
References
Zhou, D., Wang, J., He, Y., Chen, D., Li, K.: Influence of metallic shields on pulsed eddy current sensor for ferromagnetic materials defect detection. Sens. Actuators A Phys. 248, 162–172 (2016)
Chen, X., Lei, Y.: Time-domain analytical solutions to pulsed eddy current field excited by a probe coil outside a conducting ferromagnetic pipe. NDT E Int. 68, 22–27 (2014)
Ulapane, U., Nguyen, L., Miro, J.V., Alempijevic, A., and Dissanayake, G.: Designing a pulsed eddy current sensing set-up for cast iron thickness assessment. In: Proceedings of the 2017 12th IEEE Conference on Industrial Electronics and Applications, ICIEA 2017, pp. 901–906 (2017)
Ulapane, N., Alempijevic, A., Miro, J.V., Vidal-calleja, T.: Non-destructive evaluation of ferromagnetic material thickness using pulsed eddy current sensor detector coil voltage decay rate. NDT E Int. 100, 108–114 (2018)
Gang, Z., Rui, X., Haowen, L., and Kexin, Y.: Research on double coil pulse eddy current thickness measurement. In: Proceedings—10th International Conference on Intelligent Computation Technology and Automation, ICICTA 2017, vol. 1, no. 3, pp. 4–7 (2017)
Nguyen, L., Ulapane, N., Miro, J.V., Dissanayake, G., and Munoz, F.: Improved signal interpretation for cast iron thickness assessment based on pulsed eddy current sensing. In: Proceedings of the 2017 12th IEEE Conference on Industrial Electronics and Applications, ICIEA 2017, pp. 2005–2010 (2017)
Nagendran, R., Mohanty, I., Thanikai Arasu, A.V., Baskaran, R.: Transient eddy current nde system based on fluxgate sensor for the detection of defects in l multilayered conducting material. J. Nondestruct. Eval. 37, 52 (2018)
Yoshioka, S., Gotoh, Y.: Proposal of thickness measurement method of steel plate. IEEE Trans. Magn. 53(11), 1–4 (2017)
Fan, M., Huang, P., Ye, B., Hou, D., Zhang, G., Zhou, Z.: Analytical modeling for transient probe response in pulsed eddy current testing. NDT E Int. 42, 376–383 (2009)
Slobodnk, K.: Detection and evaluation of subsurface defects using pulse eddy current differential probe. In: Proceedings of 2017 18th International Conference on Computational Problems of Electrical Engineering, CPEE 2017, pp. 6–9 (2017)
Sophian, A., Tian, G., Fan, M.: Pulsed eddy current NDT & E: a review. Chin. J. Mech. Eng. 30(3), 500–514 (2017)
Woodson, H.H., Melcher, J.R.: Electromechanical Dynamics Part II: Fields, Forces, and Motion. Wiley, New York (1968)
Cheng, W.: Pulsed eddy current testing of carbon steel pipes’ wall-thinning through insulation and cladding. J. Nondestruct. Eval. 31(3), 215–224 (2012)
Faurschou, K.F., Underhill, P.R., Morelli, J., and Krause, T.W.: Pulsed eddy current probe optimization for steel pipe wall thickness measurement. In: 45th Annual Review of Progress in Quantitative Nondestructive Evaluation (2019)
Azaman, K.N., Sophian, A., Nafiah, F.: Effects of coil diameter in thickness measurement using pulsed eddy current non-destructive testing. IOP Conf. Ser. Mater. Sci. Eng. 260(1), 012001 (2017)
He, Y., Tian, G.Y., Zhang, H., Alamin, M., Simm, A., Jackson, P.: Steel corrosion characterization using pulsed eddy current systems. IEEE Sens. J. 12(6), 2113–2120 (2012)
Mokros, S.G., Underhill, P.R., Morelli, J.E., Krause, T.W.: Pulsed eddy current inspection of wall loss in steam generator trefoil broach supports. IEEE Sens. J. 17(2), 444–449 (2017)
Lara, P.F.: Transient Electromagentic Method for Detecting Corrosion on Conductive Containers Having Variations in Jacket Thickness, 4,843,319 (1989)
Li, P., et al.: System identification-based frequency domain feature extraction for defect detection and characterization. NDT E Int. 98, 70–79 (2018)
Buck, J.A., Kramer, C., Lei, J., and Lepine, B.A.: Field implementation of a transient eddy current system for carbon steel pipe thickness meaurements
Shu, L., Songling, H., Wei, Z.: Development of differential probes in pulsed eddy current testing for noise suppression. Sens. Actuators A Phys. 135(2), 675–679 (2007)
Funding
Funding was provided by NSERC (Grant Number 1111).
Author information
Authors and Affiliations
Corresponding author
Additional information
Publisher's Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Rights and permissions
About this article
Cite this article
Fu, Y., Underhill, P.R. & Krause, T.W. Factors Affecting Spatial Resolution in Pulsed Eddy Current Inspection of Pipe. J Nondestruct Eval 39, 34 (2020). https://doi.org/10.1007/s10921-020-00679-0
Received:
Accepted:
Published:
DOI: https://doi.org/10.1007/s10921-020-00679-0