A new approach for enhancing eddy-current non-destructive evaluation

Abstract

The paper proposes a new approach for enhancing depth evaluation in eddy-current non-destructive testing. A detected crack is inspected using several probes. The crack’s signals gained using the probes are linearly superposed and unique feature values of the ratio of superposition are extracted from the resulting signals. Numerical investigations as well as experimental verification reveal that the feature values provide clear indication about the depth of the detected crack. In addition, the depth of a defect that is much deeper than the standard depth of penetration can also be evaluated using the proposed approach