Measurement of the Induced Magnetic Field in a Flawed Tube
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Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.
This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.
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Abstract
In a standard eddy current method [1] for the inspection of tubing, a probe, consisting of two coils, is translated along the inside of the tube. Measured differences in impedance between the two coils are used to detect flaws in the wall of the tube. Physically what happens is alternating currents in the coils generate eddy currents in the wall of the tube. The magnetic field (primarily the axial component) from the eddy currents reduces the inductance of the coils from the free space values. A flaw will alter the eddy currents, resulting in a local change in magnetic field within the tube and hence a difference in impedance between the two coils.