Improvement of the Frequency Behavior of an EC-NDT Inspection System

  • Andrea BernieriEmail author
  • Giovanni Betta
  • Luigi Ferrigno
  • Marco Laracca
  • Antonio Rasile
Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 539)


The non-destructive testing based on eddy currents (EC-NDT) is an in-field inspection technique mainly used to detect and characterize defects in conductive materials. This technique is adopted in many industrial, manufacturing and aerospace applications. Today, in aeronautical and industrial applications, new thin carbon fiber materials often substitute metallic materials as aluminum, copper and so on. Therefore, the actual trend of EC-NDT is the in-field inspection of these very thin materials. Considering the skin depth of induced eddy current, the thinness of these materials imposes the use of higher frequencies than those typically adopted in traditional tests. Due to the inductive load of the excitation coil, the voltage required to obtain the desired current values could reach very high values. The use of resonant excitation circuits could mitigate this problem. The article describes the effect of some real resonant circuits on the improvement of feeding high-frequency EC-NDT probes in terms of required voltage and power.


Eddy current test Non destructive test Resonance High frequency 


  1. 1.
    Betta, G., Ferrigno, L., Laracca, M., Burrascano, P., Ricci, M., Silipigni, G.: An experimental comparison of multi-frequency and chirp excitations for eddy current testing on thin defects. Measurement 63, 207–220 (2015)CrossRefGoogle Scholar
  2. 2.
    Hughes, R., Fana, Y., Dixon, S.: Near electrical resonance signal enhancement (NERSE) in eddy-current crack detection. In: NDT&E International, pp. 82–89 (2014)Google Scholar
  3. 3.
    Wheeler, H.A.: Formulas for the skin effect. Proc. IRE 30(9), 412–424 (1942)CrossRefGoogle Scholar
  4. 4.
    Owston, C.N.: A high frequency eddy-current, non-destructive testing apparatus with automatic probe positioning suitable for scanning applications. J. Phys. E. Sci. Instrum. 3(10), 814 (1970)CrossRefGoogle Scholar
  5. 5.
    Liu, C.Y., Dong, Y.G.: Resonant coupling of a passive inductance-capacitance- resistor loop in coil-based sensing systems. IEEE Sens. J. 12(12), 3417–23 (2012)CrossRefGoogle Scholar
  6. 6.
    Bleaney, B.I., Bleaney, B.: Electricity and Magnetism. Oxford University Press, Oxford (1989)zbMATHGoogle Scholar
  7. 7.
    Magnetic Field Generator Uses New Resonant Circuit. Application note.
  8. 8.
    Lu, J., Huang, S., Pan, K., Qian, Z., Chen, N.: Development of characteristic test system for GMR sensor. In: Proceedings of the 8th IEEE International Symposium on Instrumentation and Control Technology (ISICT), London, pp. 20–23 (2012)Google Scholar
  9. 9.
    Bernieri, A., Betta, G., Ferrigno, L., Laracca, M.: Multi-frequency Eddy Current Testing using a GMR based instrument. Int. J. Appl. Electromagn. Mech., 355–362 (2012)CrossRefGoogle Scholar
  10. 10.
    Ferrigno, L., Laracca, M., Liguori, C., Pietrosanto, A.: An FPGA-based instrument for the estimation of R, L, and C parameters under nonsinusoidal conditions. IEEE Trans. Instrum. Meas. 61(67), 1503–1511 (2012)CrossRefGoogle Scholar
  11. 11.
    Bernieri, A., Ferrigno, L., Laracca, M., Tamburrino, A.: Improving GMR magnetometer sensor uncertainty by implementing an automatic procedure for calibration and adjustment. In: Proceedings of IEEE Instrumentation and Measurement Technology Conference (2007).
  12. 12.
    Betta, G., Ferrigno, L., Laracca, M.: Calibration and adjustment of an eddy current based multi-sensor probe for non-destructive testing. In: Proceedings of the ISA/IEEE Sensors for Industry Conference, pp. 120–124 (2002)Google Scholar

Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Andrea Bernieri
    • 1
    Email author
  • Giovanni Betta
    • 1
  • Luigi Ferrigno
    • 1
  • Marco Laracca
    • 1
  • Antonio Rasile
    • 1
  1. 1.Department of Electrical and Information EngineeringUniversity of Cassino and Southern LazioCassinoItaly

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