Computer Modeling of Eddy Current Transmit-Receive Probes for Tube Inspection
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Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.
This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.
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Abstract
Conventional eddy current bobbin probes are known to be ineffectual in detecting circumferential cracks in tubing. Rotating pancake and/or multi-pancake probes are required to detect circumferential cracks. However, it has been demonstrated in CANDU® (CANada Deuterium Uranium nuclear reactor) steam generator tubes with deformation and ferromagnetic deposits that probes with surface transmit-receive (T/R) coils are superior to those using surface impedance coils. No subsurface cracks in this tubing were detected with rotating impedance pancake coil probes and multiplexed impedance probes. In the same tubing, circumferential cracks as shallow as 50% through-wall were detected with a single-pass C3 multiplexed T/R probe.