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5. Eddy current testing
The principle of this method is shown in figure 4 .
5.1 Excitation phase analysis
The part to be tested is subjected to the action of a time-varying magnetic field, so as to induce currents in the material. A sine wave is generally used. Its frequency can vary from a few hertz to several megahertz, depending on the nature of the applications envisaged and the products inspected.
The sensitivity of the method for each application is closely linked to the choice of frequency, which conditions the penetration of induced currents: this is the "skin effect", extending to a depth that depends on the absolute magnetic permeability of the material and...
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Eddy current testing
Ultrasonic inspection
Bibliography
Non-destructive testing. General information. Cahiers de formation. CETIM 3rd edition.
Standardization
Personnel certification
- Non-destructive testing – Qualification and certification of NDT personnel – General principles. - NF EN 473/A1 - 2006-01
CND Vocabulary
- Non-destructive testing – Terminology – Part 1: List of general terms. - NF EN 1330-1 - 1999-08
- Non-destructive testing – Terminology – Part 2: Common terms for non-destructive testing methods. - NF EN 1330-2 - 1999-08 ...
Websites
More comprehensive information on the standards can be found on various websites, such as :
http://www.afiap.org The site of the professional guide to good...
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