Eddy Current
Eddy Current
It uses a probe with a built-in bobbin coil that induces eddy
currents in adjacent material.  Should the probe encounter
flaws as it is pulled  through the tube, the eddy currents are
interrupted, causing an impedance change in the coil. The
impedance change is measured and displayed on a monitor.
Eddy Current  testing is very sensitive to most defects that
occur in tubes.  It is critical to use correct eddy current
techniques and procedures for conclusive results.
The three primary techniques are:
Differential, Absolute, and Multi-frequency
Differential Method:
Absolute Method:
Multi-frequency Method:
The Differential Method  uses two coils in one
The Absolute Method uses two separate probes,
conducts  multiple  differential and absolute tests with frequency mix
techniques. This powerful examination combines the defect detection
capabilities of the previous  methods into a single,  accurate test.   It also
provides enhanced  defect detection  for  each  type of test  through the
use of multiple  frequencies  sensitive to  different types of defects.
probe to compare adjacent sections of the tube. When both coils are
positioned on sound areas, the signals from both are identical.  When one
coil passes over a defect,  the instrument compares the differences in the
two signals to evaluate the defect.   This  method is very  sensitive to
defects  that  cause an abrupt wall section change.
one positioned in a known reference tube, the second positioned in the
tube under  examination.   The instrument compares the signals from the  
two probes to detect and  evaluate the  defects.   This method is sensitive
to gradual  volumetric changes in the tube wall.
The Multi-frequency Method  simultaneously
.
ADVANCED TECHNIQUES
USE COMPUTER CONTROLLED INSTRUMENTS
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Magnetec Inspection Inc.
1159 East North St.,
Bradley, IL 60915
815 802-1363 T
815-802-1238 T
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THE EDDY CURRENT TECHNIQUE
It is based on the induction of an electromagnetic field in
the component undergoing inspection.  It can be applied to
electrically conducive but non-ferromagnetic materials,
and can detect various forms of internal and external
damage to the object being tested.
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Eddy Current
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