Title :
New Method for Suppressing Lift-Off Effects Based on Hough Transform
Author :
Zhu Wen-long ; Shen Han-xin ; Chen Wen-xiang
Author_Institution :
Dept. of Electron. Eng., Xiamen Univ., Xiamen, China
Abstract :
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 lift-off 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.
Keywords :
cracks; eddy current testing; Hough transform; crack detection; eddy current detection technique; electromagnetic property; error detection; flaws; lift-off effects; nondestructive technique; Circuit testing; Coils; Current measurement; Eddy current testing; Eddy currents; Electric variables measurement; Electromagnetic measurements; Equivalent circuits; Impedance; Mechanical variables measurement; eddy current test; hough transform; lift-off effect; non-destructive technique;
Conference_Titel :
Measuring Technology and Mechatronics Automation, 2009. ICMTMA '09. International Conference on
Conference_Location :
Zhangjiajie, Hunan
Print_ISBN :
978-0-7695-3583-8
DOI :
10.1109/ICMTMA.2009.543
