Eddy current inspection system

摘要

An innovative method is provided for assessing structural integrity of a sample. The method comprises: capturing a signal indicative of magnetic flux density caused by an Eddy current flowing in the sample; extracting an envelope of the captured signal using a demodulation scheme; sampling the envelope at a frequency that is lower than the frequency of the excitation current signal which generated the Eddy current; and examining the sampled envelope to assess structural integrity of the sample.