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.
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References
W.F. Schmidt and O.H. Zinke, Review of Progress in QNDE, Vol 12, eds. by D.O. Thompson and D.E. Chimenti, (Plenum Press, New York, 1993), p. 1885.
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O.H. Zinke, U.S. Patent #4,901,017 (February 13, 1990), Canadian Patent #1296061 (February 18, 1992), European Common Market Patent #0329781, (March 29, 1995).
M.R. Woodward, H.A. Sreshta, O.H. Zinke, and W.F. Schmidt, “Surface Flaws Using a Modified AC Magnetic Bridge”, Experimental Mechanics, Vol. 35, Society of Experimental Mechanics, December, 1995, p. 367.
W.F. Schmidt, O.H. Zinke, and S. Nasrazadani,“Characterization of a Crack in an Aluminum Bar Using an AC Magnetic Bridge”, 147–163, Special Technical Paper 1251, American Society of Testing and Materials, ASTM, Philadelphia, PA, April, 1995.
W.F. Schmidt and O.H. Zinke, Review of Progress in QNDE, Vol 14, eds. by D.O. Thompson and D.E. Chimenti, (Plenum Press, New York, 1995), p. 1725.
O.H. Zinke and W.F. Schmidt, “Linear AC Magnetic Circuit Theory”, IEEE Transactions on Magnetics, Vol. 29, 1993, p. 2207.
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© 1998 Plenum Press, New York
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Schmidt, W.F., Zinke, O.H. (1998). Saw-Cut Scanning Patterns. In: Thompson, D.O., Chimenti, D.E. (eds) Review of Progress in Quantitative Nondestructive Evaluation. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-5339-7_237
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DOI: https://doi.org/10.1007/978-1-4615-5339-7_237
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