This paper proposes a passive differential tangential surface probe with dual induction as a means of suppressing lift-off signals in eddy current testing. Simulations and experiments confirmed that the proposed probe is superior to a pancake probe and a self-induction differential tangential probe in its ability to selectively attenuate the lift-off signals. On the other hand, the crack signals of the proposed probe were almost the same as that of the self-induction probe. The results show that the proposed probe can detect minute defects that have been difficult to detect in situations where it is difficult to maintain a constant lift-off, such as when specimens are vibrating.
ReboudCPremelDPichenotG, et al.Development and validation of a 3D model dedicated to eddy current non-destructive testing of tubes by encircling probes. Int J Appl Electromagn Mech2007; 25: 313–317.
2.
BartelsKAFisherJL. Multifrequency eddy current image processing techniques for nondestructive evaluation. Proc Int Conf Image Process1995; 1: 486–489.
3.
KosakaDKakishitaKNaraT. Plating thickness evaluation with the radial basis functions. Int J Appl Electromagn Mech2020; 64: 1081–1089.
SophianATianGTaylorD,et al.Electromagnetic and eddy current NDT: a review. Insight2001; 43: 302–306.
6.
PostolacheORamosHGRibeiroAL,et al.GMR Based eddy current sensing probe for weld zone testing. In: IEEE sensors, 2009, pp.73–78. DOI: https://doi.org/10.1109/ICSENS.2009.5398524.
7.
HoshikawaHKoyamaK. Uniform eddy current probe with little disrupting noise. In: ThompsonDOChimentiDE (eds) Review of progress in quantitative nondestructive evaluation. Vol. 17A. Boston, MA: Springer US, 1998, pp.1059–1066. DOI: https://doi.org/10.1007/978-1-4615-5339-7_137.
8.
RepeliantoASKasaiN. The improvement of flaw detection by the configuration of uniform eddy current probes. Sensors (Basel)2019; 19: 397.
9.
BernieriAFerrignoLLaraccaM,et al.Eddy current testing probe based on double-coil excitation and GMR sensor. IEEE Trans Instrum Meas2019; 68: 1533–1542.
10.
KosakaDKumakuraYKojimaF,et al.New eddy current probe for vibration signal suppression. IEEE Trans Magn2022; 58: 1–5.
11.
SchoeberlJ. C++11 implementation of finite elements in NGSolve. ASC Report 30/2014, Institute for Analysis and Scientific Computing, Vienna University of Technology, 2014.
12.
MizunoTEnokiSHayashiT, et al.Extending the linearity range of eddy-current displacement sensor with magnetoplated wire. IEEE Trans Magn2007; 43: 543–548.
13.
KosakaDKumakuraYKojimaF. Dual induction eddy current probe for vibration noise reduction. IEEE Trans Magn2023; 59: 1–6.
