Non Destructive Testing 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…
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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…
Non Destructive Testing 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…
Non Destructive Testing 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…
Non Destructive Testing 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…
Non Destructive Testing 3 min read
Probes – Configurations
Eddy current probes are classified by the configuration and mode of operation of the test coils. The configuration of the…
Non Destructive Testing 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…
Uncategorized 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…
Non Destructive Testing 3 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…
Non Destructive Testing 2 min read
Bridges
The bridge circuit shown above is known as the Maxwell-Wien bridge (often called the Maxwell bridge), and is used to…
Non Destructive Testing 2 min read
Resonant Circuits
Eddy current probes typically have a frequency or a range of frequencies that they are designed to operated. When the probe…
Non Destructive Testing 1 min read
Eddy Current Instruments
Eddy current instruments can be purchased in a large variety of configurations. Both analog and digital instruments are available. Instruments are commonly…