Circular eddy current coils surrounding a pipe containing a flaw - QuickField simulation example
Induced EMF in an eddy-current NDT probe coil versus probe position along a metal pipe containing a flaw, showing the electrical response to the defect. This simulation example is prepared by Professor James R. Claycomb as a part of the webinar QuickField Analysis for Non-Destructive Evaluation Simulations.
How to calculate the EMF in the probing coil as a function of the NDT unit position?
Answer Typical applications Geometry
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Task
Solution
Results
Reference
Engineering question
Sweep the flaw position with LabelMover and calculate the induced EMF in the probing coil at each NDT-unit position.
eddy current inspection coils, pipeline inspection probes, nondestructive testing coils
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Simulation problem
Problem Type
Axisymmetric problem of AC magnetics.
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.
Determine the EMF in the probing coil as a function of the NDT unit position.
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.
Eddy currents distribution in the pipe and induced voltage in the probe coil per 1 turn are shown on the picture below.
James R. Claycomb Applied Electromagnetics Using QuickField & MATLAB, ISBN: 978-0763777517, hardcover, 400 pages.
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