Why is the concept of "coil spacing" relevant in Eddy Current Testing?

The relevance of "coil spacing" in Eddy Current Testing centers around its impact on the sensitivity and resolution of the signals detected during the testing process. Coil spacing refers to the distance between the coils used in the testing apparatus, which can significantly affect how the electromagnetic fields interact with the material being tested.

When the coils are properly spaced, they can more effectively couple with the material's surface and any flaws present, leading to clearer signals and improved detection capabilities. Sensitivity is crucial because it determines the system's ability to identify small defects or changes in material properties, while resolution influences how well the system can distinguish between different defects or varying signal amplitudes.

In contrast, factors such as the power supply, the overall size of the equipment, or the concept that coil spacing has no impact are less significant to the core objectives of Eddy Current Testing, which revolve around accurate and reliable detection of flaws within conductive materials. Thus, understanding how coil spacing influences sensitivity and resolution directly relates to the effectiveness of the testing process.