Analytical Calculation of Induced Voltages of Uniform Eddy Current Probes Above a Moving Conductor
Eddy-current testing is an important nondestructive testing method in defect detection and evaluation of conductive materials. In testing of moving multilayer conductive plates, a rectangular exciting coil is placed perpendicular to the conductor, and cylindrical or rectangular coils are positioned below the exciting coil serving as pick-up coils. Accurate theoretical expressions of the induced voltage variations in the pick-up coils are derived, and the influences of the two pick-up coils’ exciting frequency and moving speed to the induced voltages are evaluated and compared. The rectangular and cylindrical pick-up coils are also used in testing for flaws in the conductors. The analytical calculation results are verified with experimental results.
KeywordsEddy-current testing Magnetic field sensors Induced voltage
The authors would like to acknowledge the financial support by the National Natural Science Foundation of China (51175321) and the Shanghai Maritime University (20130463).
- 3.Li G, Huang P, Chen P, Hou D, Zhang G, Zhou Z (2010) Quantitative nondestructive estimation of deep defects in conductive structures. Int J Appl Electromagnetics Mech 33(3):1273–1278Google Scholar
- 7.Zhang D, Yu Y, Chao L, Tian G (2015) Thickness measurement of multi-layer conductive coatings using multifrequency eddy current techniques. Nondestructive Test Eval:1–18Google Scholar
- 8.Laurinavičius L (2011) Helicon resonator based strong magnetic field sensor. Meas Sci Rev 11(11):149–153Google Scholar
- 9.Hesse O, Pankratyev S (2005) Usage of magnetic field sensors for low frequency eddy current testing. Meas Sci Rev 5(3):86–93Google Scholar
- 10.Matkova V, Strapacova T (2012) Detection sensors for electromagnetic nondestructive evaluation. IEEE ELEKTRO:435–438Google Scholar