In feasibility studies the microwave-based non-destructive testing (NDT) has proven to be powerful for the defectoscopy of insulating parts, especially of such which are made from plastic and glass fibre-reinforced plastic (GFRP) [1], [2], [3]. For weight reduction purposes such materials are more and more used in the fields of automotive, aerospace, and ship building or even windpower. Up to now, however, microwave defectoscopy represents itself more as an academic research topic than a routine procedure for practical applications. The reason for this is probably that the microwave technique and the interpretation of the test results seem to be complicated. The present paper solves these problems by proposing an appropriate transverter for use together with standard eddy current test systems.

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