Transient Eddy Current NDE System Based on Fluxgate Sensor for the Detection of Defects in Multilayered Conducting Material

  • R. NagendranEmail author
  • Ijee Mohanty
  • A. V. Thanikai Arasu
  • R. Baskaran


This paper describes a novel transient eddy current non destructive evaluation (NDE) system for the detection of defects in a multilayered conducting material by using fluxgate magnetometer as a sensor. In conventional eddy current NDE, the depth of defect detection is restricted due to the excitation frequency and its associated skin depth. Similarly, in conventional pulsed eddy current testing the time derivative of the secondary magnetic field, which decays much faster than the magnetic field itself, is measured by the induction coil. However, in this work we use fluxgate magnetometer which measures magnetic field directly and double “D” differential excitation coil in order to enhance the depth of investigation. In addition to this, the other instruments such as transmitter, transmitter controller and data acquisition system used for this work are the same one used for TEM based geophysical applications. The system has been used for the detection of an artificially engineered defect in an aluminum plate at a depth of 2 mm as well as 20 mm below the surface.


Transient eddy current NDE Fluxgate magnetometer Defect detection Double “D” excitation coil 



The authors would like to thank Dr. N.V. Chandra Shekar and Dr. G. Amarendra for their continuous support and encouragement for this work.


  1. 1.
    Bray, E., Stanley, R.K.: Nondestructive Evaluation—a Tool in Design, Manufacturing and Service. CRC Press Inc, Boca Raton (1997)Google Scholar
  2. 2.
    Rao, B.P.C.: Practical Eddy Current Testing. Indian Society for Non-destructive Testing, Guindy (2007)Google Scholar
  3. 3.
    Thollon, F., Burais, N.: Geometrical optimization of sensors for eddy currents non-destructive testing and evaluation. IEEE Trans. Magn. 31, 2026–2031 (1995)CrossRefGoogle Scholar
  4. 4.
    Smith, R.A., Hugo, G.R.: Transient eddy-current NDE for ageing aircraft. Insight 43, 14–20 (2001)Google Scholar
  5. 5.
    Tai, C.C., Rose, J.H., Moulder, J.C.: Thickness and conductivity of metallic layers from pulsed eddy current measurements. Rev. Sci. Instrum. 67, 3965–3972 (1996)CrossRefGoogle Scholar
  6. 6.
    Yang, H.C., Tai, C.C.: Pulsed eddy-current measurement of a conducting coating on a magnetic metal plate. Meas. Sci. Technol. 13, 1259–1265 (2002)CrossRefGoogle Scholar
  7. 7.
    Sophian, A., Tian, G.Y., Taylor, D., Rudlin, J.: Electromagnetic and eddy current NDT: a review. Insight 43, 302–306 (2001)Google Scholar
  8. 8.
    Angani, C.S., Park, D.G., Kim, C.G., Leela, P., Kollu, P., Cheong, Y.M.: The pulsed eddy current differential probe to detect a thickness variation in an insulated stainless steel. J. Nondestruct. Eval. 29, 248–252 (2010)CrossRefGoogle Scholar
  9. 9.
    Yang, B., Zhang, H., Jang, Z., Wang, X.: Investigation of pulsed eddy current probes for detection of defects in riveted structures. Nondestruct. Test. Eval. 28(3), 278–290 (2013)CrossRefGoogle Scholar
  10. 10.
    Cheng, W.: Pulsed eddy current testing of carbon steel pipes’ wall-thinning through insulation and cladding. J. Nondestruct. Eval. 31(3), 215–224 (2012)CrossRefGoogle Scholar
  11. 11.
    Krause, H.J., Panaitov, G.I., Zhang, Y.: Conductivity tomography for non-destructive evaluation using pulsed eddy current with HTS SQUID magnetometer. IEEE Trans. Appl. Supercond. 13, 215–218 (2003)CrossRefGoogle Scholar
  12. 12.
    Nabighian, M.N., Macnae, J.C.: Time domain electromagnetic prospecting methods. In: Nabighian, M.N. (ed.) Electromagnetic Methods in Applied Geophysics. Applications Part A, vol. 2, pp. 427–520. Society of exploration geophysicists, Oklahoma (1991)CrossRefGoogle Scholar
  13. 13.
    Nagendran, R., Janawadkar, M.P., Pattabiraman, M., Baisnab, D.K., Jayapandian, J., Baskaran, R., et al.: Development of SQUID based system for non-destructive evaluation. IEEE Trans. Appl. Supercond. 17, 3824–3829 (2007)CrossRefGoogle Scholar
  14. 14.
    Nagendran, R., Janawadkar, M.P., Pattabiraman, M., Baisnab, D.K., Baskaran, R., et al.: Development of SQUID-based non-destructive evaluation system for detecting fatigue induced transformation of δ-ferrite to non-magnetic phases. NDTE Int. 40, 215–219 (2007)CrossRefGoogle Scholar
  15. 15.
    Nagendran, R., Thirumurugan, N., Chinnasamy, N., Janawadkar, M.P., Baskaran, R., Vaidhyanathan, L.S., Sundar, C.S.: Optimum eddy current excitation frequency for subsurface defect detection in SQUID based non-destructive evaluation. NDTE Int. 43, 713–717 (2010)CrossRefGoogle Scholar
  16. 16.
    Bartington Instruments Ltd., UK.

Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • R. Nagendran
    • 1
    Email author
  • Ijee Mohanty
    • 1
  • A. V. Thanikai Arasu
    • 1
  • R. Baskaran
    • 1
  1. 1.Materials Science Group, Indira Gandhi Centre for Atomic ResearchHomi Bhabha National InstituteKalpakkamIndia

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