| 摘要 |
A method of inspecting an electrically conductive object so as to detect the presence of an anomaly using a probe comprising a transmitter coil and a receiver coil, which method comprises the steps of:(a) selecting a set of points on the near surface of the object that are to be inspected;(b) selecting a first inspection point from the set;(c) positioning the probe at the selected inspection point, inducing eddy currents in the object and determining a characteristic value, PHI, of the electromagnetic field generated by the eddy currents;(d) selecting a next inspection point from the set and repeating step (c) until all inspection points have had their turn; and(e) inferring that an anomaly is present at an inspection point if the characteristic value PHI differs significantly from a norm.
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