Basics 3 min read
Conductivity Measurements
One of the uses of eddy current instruments is for the measurement of electrical conductivity. The value of the electrical…
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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…
Basics 6 min read
Surface Crack Detection Using Sliding Probes
Surface Crack Detection Using Sliding Probes Many commercial aircraft applications involve the use of multiple fasteners to connect the multi-layer…
Basics 6 min read
Signal Filtering
Signal filtering is often used in eddy current testing to eliminate unwanted frequencies from the receiver signal. While the correct…
Basics 2 min read
Reference Standards
In eddy current testing, the use of reference standards in setting up the equipment is particularly important since signals are…
Basics 2 min read
Impedance Matching
Eddy current testing requires us to determine the components of the impedance of the detecting coil or the potential difference…
Basics 3 min read
Coil (Probe) Design
The most important feature in eddy current testing is the way in which the eddy currents are induced and detected…
Basics 2 min read
Probes – Shielding Loading
One of the challenges of performing an eddy current inspection is getting sufficient eddy current field strength in the region…
Basics 3 min read
Probes – Configurations
Probes – Configurations Eddy current probes are classified by the configuration and mode of operation of the test coils. The…
Basics 3 min read
Absolute Probes
Absolute probes generally have a single test coil that is used to generate the eddy currents and sense changes in…
Basics 1 min read
Display – Analog Meter
Analog instruments are the simplest of the instruments available for eddy current inspections. They are used for crack detection, corrosion…
Basics 2 min read
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…