Back to Joe's Papers| Authors Note: As most of you are aware, I now work for Sonatest Plc, manufacturers of Ultrasonic NDT equuipment. At the time when I originally wrote this I was employed by Hocking NDT. Refer to their web-page for more details. Other reputable manufacturers of Eddy Current instruments include Rohmann GmbH , Zetec ( I currently work with Zetec products) and Forster |
Historical Context
Basic Electrical Theory: Current Flow in DC circuits
Electromagnetic Induction
Current flow in AC Circuits - Impedance
Simple Coil above a metal surface
Factors affecting eddy current response
Depth of Penetration
The impedance plane
Coil Configurations:
Typical Instrumentation
Meter/CRT Instruments
Operating frequency
Instrument set-up
Rate Filtering
Surface Crack Inspection
Non-Ferrous metal sorting
Sub-surface crack and corrosion detection
Heat Exchanger Tube testing
In-line inspection of steel tubing
Ferrous weld inspection
Bibliography
Written by Joseph M. Buckley,
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