Saw-Cut Scanning Patterns
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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
The scanning of surface saw cuts can yield clues both about the interaction of nondestructive evaluation (NDE) devices with samples and the ability to detect and characterize flaws of other shapes. In this case, the device is a modified AC magnetic bridge (the bridge) which has been described elsewhere [1,2,3]. Electrical bridges can be operated in two modes: Off-null operation occurs when the bridge output is minimized (nulled) and the reaction of the bridge to various samples is judged by changes in the output voltage. Off-null operation is principally used for control. Renull operation occurs when the bridge is nulled for each sample and the physical parameters required to null the bridge (usually resistance and/or resistance and capacitance) can be used to determine physical differences in the samples.