Eddy current testing has been widely used to evaluate metallic tubes. In engineering, bobbin probes are often used and required to work along the axis of the tube under test. However, alignment work can not be performed in many cases, and probes probably deviate from the tube axis in the detection process, namely probe offset. Based on the second-order potential (SOVP) theory, this work presents the analytical formulation for the off-centered driver-pickup bobbin probe. Following that, simulations are carried out to investigate radial offset impact on induced eddy current distribution in a conducting tube. Finally, the resulting signal errors are evaluated. This research may provide some help to improve accuracy and reliability for eddy current nondestructive testing.
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