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Alternating Current Field Measurement:
Getting New Technologies Accepted by Old IndustriesFigure 4-5
Figure 4 - Description of magnetic field flow around a crack: the Bx sensor responds to current density and shows a reduction with crack depth; the Bz sensor responds to crack ends and shows a trough/peak as the probe passes over the crack and indicates crack length.
Figure 5 - Typical traces from a discontinuity with standard probe: (a) chart recorder; (b) butterfly plot.
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