Automatic Differential Lift-Off Compensation (AD-LOC) Method In Pulsed Eddy Current Inspection

摘要

In the state of art Pulse Eddy Current inspection application, we present a novel method of Automatic Differential Lift-Off Compensation (AD-LOC). The lift-off key features were defined and extracted by the discovery of a strong relationship between the ifferential peak value of the sensed PEC signal and the lift-off distance. The corresponding compensation formula was then created. A practical implementation scheme was proposed based on the described method. Functions such as automatic reorganization, classification and optimal compensation regarding the randomly occurring of lift-off disruption were implemented.