What is primarily affected when using spinning probe eddy current instruments?

The use of spinning probe eddy current instruments is primarily focused on the detection of surface defects. These instruments utilize the principles of eddy current testing, which is a non-destructive testing method that measures the response of eddy currents induced in a conductive material.

When a spinning probe is employed, it enhances the sensitivity to changes in the material by enabling the detection of both surface discontinuities and variations in material properties. The rotating motion of the probe allows for comprehensive scanning of the surface area, which increases the likelihood of identifying cracks, pits, and similar defects.

Although other factors such as surface roughness, electrical conductivity, and detection of interior flaws are important in the broader context of eddy current testing, they do not represent the primary focus of spinning probe instruments. In particular, this technique is designed for precise surface assessment, making it especially suited for locating superficial anomalies.