Fig.7-14 Detection of a fatigue crack by a multi-coil sensor (a) and defects under the support plate by a bobbin coil (b)
X = sin(ωt), Y = sin(ωt + 90 °)
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Fig.7-14 Detection of a fatigue crack by a multi-coil sensor (a) and defects under the support plate by a bobbin coil (b)
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