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Within the German Standard Organization a working group was engaged with the task of investigating and specifying methods for testing the essential properties of eddy-current test equipment for application to the inspection of tubes with feed-through coil systems. For this purpose several reference standards are required; these contain artificial defects such as holes, longitudinal and transverse notches, and milled-off segments. Several materials are recommended for use in the usual frequency ranges.
eddy current test equipment, tube inspection, feed-through coil systems, reference standards, artificial defect, drilled hole, notch, defect length, defect resolution, end effect, frequency range
Bundesanstalt für Materialprüfung, Berlin,
Fa. Schmöhle, Menden,
Institut Dr. Förster, Reutlingen,