Patent ID: 6424151
Filing Date: 2002-07-23
Classification: G01N

Abstract:
A method for evaluation of an eddy current testing signal, comprising:generating a feature amount based on a sample eddy current testing signal obtained by measuring a standard specimen as a member to be measured and of a known depth of a flaw, the feature amount being a numerical expression of not only a phase angle of the sample eddy current testing signal correlated to the depth of the flaw, and an amplitude of the sample eddy current testing signal, but also a feature correlated to a secondary factor which is other than the depth of the flaw and which affects a waveform of the sample eddy current testing signal; generating an evaluation parameter by learning with use of the feature amount, the evaluation parameter being a parameter for outputting a value with a sufficiently small error relative to known correct answer data as an amount expressing the depth of the flaw of the standard specimen; generating a feature amount similar to that from the sample eddy current testing signal by use of an actual measurement eddy current testing signal obtained by eddy current testing of a member as an object to be measured; and generating data representing the depth of the flaw on the basis of the feature amount based on the actual measurement eddy current testing signal, and the evaluation parameter corresponding to the feature amount.