What does "differential testing" enhance in Eddy Current Testing?

Differential testing in Eddy Current Testing is primarily focused on enhancing the sensitive signal identification between two points. This method involves comparing the signals from two separate measurement locations, allowing for improved sensitivity to small changes in the material under test. By assessing the variations in the signals received from these points, differential testing enables the detection of subtle anomalies or defects that may not be discernible through standard testing methods that analyze signals from a singular point.

The process essentially highlights discrepancies caused by flaws or changes in material properties, which enhances the overall accuracy and reliability of the testing results. This is particularly useful in identifying localized defects or variations that could otherwise be masked by background noise or similar signals from the surrounding material.

While detection of surface flaws, comparison of temperature effects, and calibration of the testing probe are all important aspects of Eddy Current Testing, they do not directly pertain to the enhancement provided by differential testing regarding sensitive signal identification between distinct measurement points.