Why is knowledge of the material's geometry crucial in Eddy Current Testing?

Knowledge of the material's geometry is crucial in Eddy Current Testing because it directly influences the selection of appropriate probe types. Different geometries can affect the way eddy currents flow within the material and how they interact with defects or anomalies present. For example, the shape and size of the test piece may require specific probes designed to effectively couple with the surface and penetrate the material to a suitable depth. If the probe does not match the geometry of the test material, it may lead to ineffective testing, poor signal quality, or missed indications of flaws.

Thus, understanding the geometry ensures that the operator can choose a probe that will provide accurate and reliable measurements, allowing for effective detection of defects and assessments of material integrity. This is a fundamental aspect of conducting successful Eddy Current Testing.