Automatic Generation and Execution of Eddy Current Scan Plans

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Date
1995
Authors
Hebbalae, C.
Atthivarapu, R.
Lehther, D.
Nakagawa, Norio
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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Abstract

Eddy current inspection is highly sensitive to the position of the probe relative to the component being scanned. Ensuring that the probe maintains a constant lift-off and remains perpendicular to the surface being scanned is very import to the scanning process, as the signal strength is best under the these constraints. Variations of tilt or lift-off during a scan can introduce large, spurious signals that may mask flaw indications. Earlier work on scan automation used the probe signal to control the lift-off variations so that a constant lift-off could be maintained over a non-planar surface[1]. The present study focuses on achieving probe perpendicularity and constant lift-off all through a given scan, to attain accurate and rep eatable eddy current measurements.

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Sun Jan 01 00:00:00 UTC 1995