Quantitative Assessment of Corrosion in Aircraft Structures Using Scanning Pulsed Eddy Current

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1998
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Bieber, Jay
Tai, Cheng-Chi
Moulder, John
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Review of Progress in Quantitative Nondestructive Evaluation
Center for Nondestructive Evaluation

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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Eddy current nondestructive testing techniques are used extensively in industry for detection of hidden cracks and corrosion in multi-layer conductive structures such as those found in aircraft. Most conventional eddy current techniques employ a probe coil excited with a continuous sine wave. The changes in the probe’s impedance are detected (usually with an electronic bridge circuit) and displayed in real time on an impedance plane CRT display. Interpretation of the impedance-plane trajectories that result from scanning the probe over a defect is difficult; it involves a considerable amount of operator skill and knowledge and the equipment is sometimes difficult to set up and operate. We have developed an eddy current inspection system using the pulsed eddy current technique, which greatly reduces the possibility of operator errors and subjectivity in the quantitative interpretation of test results.

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Thu Jan 01 00:00:00 UTC 1998