What does phase angle adjustment achieve in Eddy current testing?

Phase angle adjustment in Eddy current testing is crucial for ensuring that the phase of the detected signals aligns with the reference signals. This alignment is essential for accurately interpreting the results, particularly in identifying and characterizing defects within the test material. When the phase angles are correctly adjusted, the tester can distinguish between different types of defects, such as cracks or corrosion, based on the changes in impedance that these defects introduce to the Eddy current flow.

This capability is especially significant in applications where precision is paramount, as misalignment can lead to erroneous conclusions about the integrity of the material being tested. In summary, phase angle adjustment enhances the reliability of defect detection by ensuring that the signal phase corresponds appropriately to expected reference values.