Method of non-destructive testing and detection of defects in electrically conducting material using eddy current test method overcomes/reduces some limitations and error sources

摘要

The method involves using the eddy current method with a measurement head of the magnetometer or gradiometer type and comparison of measurements on defects with measurements on a reference body. Defects are classified into groove-like and non-groove-like defects using measurement results measured as complex induction voltages. A normalised measurement parameter for normalising the induction voltage is selected depending on the crack class and selected measurement head. A groove calibration curve is formed for various groove depths in the reference body(ies). The measured voltage (VR) is normalised and compared with the calibration curve to determine the groove depth.