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Tube Inspection
Eddy current inspection is often used to detect corrosion, erosion, cracking and other changes in tubing. Heat exchangers and steam…
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Surface Crack Detection Using Sliding Probes
Many commercial aircraft applications involve the use of multiple fasteners to connect the multi-layer skins. Because of the fatigue stress…
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Signal Filtering
Signal filtering is often used in eddy current testing to eliminate unwanted frequencies from the receiver signal. While the correct…
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Reference Standards
In eddy current testing, the use of reference standards in setting up the equipment is particularly important since signals are…
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Impedance Matching
Eddy current testing requires us to determine the components of the impedance of the detecting coil or the potential difference…
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Coil (Probe) Design
The most important feature in eddy current testing is the way in which the eddy currents are induced and detected…
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Probes – Shielding & Loading
One of the challenges of performing an eddy current inspection is getting sufficient eddy current field strength in the region…
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Probes – Configurations
Eddy current probes are classified by the configuration and mode of operation of the test coils. The configuration of the…
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Absolute Probes
Absolute probes generally have a single test coil that is used to generate the eddy currents and sense changes in…
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Display – Complex Impedance Plane
Electrical Impedance (Z), is the total opposition that a circuit presents to an alternating current. Impedance, measured in ohms, may include resistance…
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Bridges
The bridge circuit shown above is known as the Maxwell-Wien bridge (often called the Maxwell bridge), and is used to…
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Resonant Circuits
Eddy current probes typically have a frequency or a range of frequencies that they are designed to operated. When the probe…