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Circular eddy current coils surrounding a pipe containing a flaw

QuickField simulation example

As an example of eddy current nondestructive testing we simulate the eddy currents induced in a section of pipe containing defects. This simulation example is prepared by Professor James R. Claycomb as a part of the webinar QuickField Analysis for Non-Destructive Evaluation Simulations.

Problem Type
Axisymmetric problem of AC magnetics.

Geometry
Circular eddy current coils surrounding a pipe containing a flaw Determine the EMF in the probing coil as a function of the NDT unit position. Pipe Probe Flaw I+ I- Ø 40 mm

Given
Drive coil AC current is I = 10 A, frequency f = 500 Hz.
Conductivity of pipe g = 1 MS/m, magnetic permeability of pipe μ = 1.

Task
Determine the EMF in the probing coil as a function of the NDT unit position.

Solution
A series of problems is generated by LabelMover. It is more convenient to change the flaw position in the model instead of moving the NDT unit.

Results
Eddy currents distribution in the pipe and induced voltage in the probe coil per 1 turn are shown on the picture below.
Circular eddy current coils surrounding a pipe containing a flaw

Reference
James R. Claycomb Applied Electromagnetics Using QuickField & MATLAB, ISBN: 978-0763777517, hardcover, 400 pages.