New Method for Suppressing Lift-Off Effects Based on Hough Transform
- 物理技术－会议论文 
A major problem for crack or electromagnetic property measurement in eddy current detection technique is the lift-off effect. The nonzero value of lift-off distance tends to smear out the discontinuity in the detected signal, causing errors detection. The paper shows the test results of lift-off effect in normalized impedance plane. Curves are transformed to Hough plane by Hough transform and consequently the liftoff effect is suppressed effectively. The method is convenient to distinguish different electromagnetic characteristic of material which can be used to detect crack or other flaws in material.