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Development of Open-Connect Type Eddy Current Transducers for the Detection of Surface Flaws in Continuous Pipeline  

Kim, Young-Joo (Nondestructive Evaluation Group, Kiorea Research Institute of Standards and Science)
Ahn, Bong-Young (Nondestructive Evaluation Group, Kiorea Research Institute of Standards and Science)
Lee, Seung-Seok (Nondestructive Evaluation Group, Kiorea Research Institute of Standards and Science)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.22, no.2, 2002 , pp. 187-192 More about this Journal
Abstract
The open-connect type eddy current transducer for the flaw detection in continuously connected pipelines was developed. This eddy current transducer is for the on-line inspection of the tubes in industries, to which commercial encircling probes are not applicable. The excitation coil that consists of a ribbon type cable and a flat connector can be opened and closed on purpose. The sensing coils of this transducer are circumferentially arrayed near the outside of the tube wall but axially displaced from the exciter by about one and half tube diameter. In application to steel tubes, and the performance of this transducer was evaluated as a little behind those of magnetic saturation type in signal to noise ratio and flaw size decision, but usable to detect or to locate large size flaws in steel tubes. Surface cracks deeper than 19% of the tube thickness could be detected with good signal to noise ratio.
Keywords
open-connect type transducer; steel tube inspection; remote field eddy current;
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