What is the purpose of conducting multi-frequency Eddy current tests?

The purpose of conducting multi-frequency Eddy current tests primarily revolves around enhancing the capabilities of defect detection. By employing multiple frequencies during testing, operators can probe materials at different depths and gain insights into different types of defects. Different frequencies interact with the material's surface and subsurface features in unique ways; lower frequencies are typically better for deeper penetration, while higher frequencies are more sensitive to surface-breaking defects. This multi-faceted approach leads to a comprehensive evaluation of the material, allowing for improved identification of cracks, corrosion, and other irregularities that might go undetected with a single-frequency test. This enhanced capability is crucial for ensuring the integrity and reliability of components in various applications, particularly in industries like aerospace and manufacturing where safety is paramount.