Precision measurement of thickness and conductivity of circular and plane products with eddy current metrology

deHalleux, Benoît;Ptchelintsev, A
(1997) 8th International Symposium on New Measurement and Calibration Methods of Electrical Quantities and Instruments (IMEKO TC 4) — Location: BUDAPEST(Hungary) (16.September.1996)

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  • deHalleux, BenoîtUCLouvain
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  • Ptchelintsev, A
    Author
Abstract
We report here the following topics of a quantitative nondestructive evaluation using eddy currents: cross-section measurements of long conductive products; measurement of the wall thickness and conductivity of conductive non-magnetic tubes; measurement of the thickness and conductivity of foils. On non-magnetic circular rods and tubes, and accuracy of the cross-section measurement was better than 0.3%. for hexagonal and square profiles, the accuracy was typically within 2%. Measurements performed on copper wires (empty set 0.9-1.5 mm) at 1 MHz implied errors on diameter determination typically lower than 4 mu m. Experiments on circular steel rods and wires (empty set 0.9-13 mm) in presence of the magnetic field H=40000 A/m have shown the accuracy of the diameter measurements better than 40 mu m. Experimental tests for brass and copper tubes (empty set 12-20 mm) with nominal wall thickness from 0.9 to 2.5 mm were carried out. Thickness was typically determined with a 2% accuracy simultaneously with a tube electrical conductivity. An uncertainty on conductivity measurements lower than 5% is obtained. An eddy current method based on the theoretical model of two-conductor line placed above a plane conductive medium is also developed. Copper and aluminium foils having thicknesses 15-200 mu m are studied experimentally in the frequency range 5-100 kHz. The uncertainty of the conductivity and thickness measurement better than 2% typically within 1% is obtained.
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deHalleux, B., & Ptchelintsev, A. (1997). Precision measurement of thickness and conductivity of circular and plane products with eddy current metrology. Insight (Northampton) : non-destructive testing and condition monitoring, 39(12), 854-857. https://hdl.handle.net/2078.5/44427 (Original work published 1997)