Rotating Field Eddy Current Imaging for the Non-Destructive Evaluation of Buried and Oriented Defects in Riveted Lap-Joints

Yohan Le Diraison (1, 2, 3) , Pierre-Yves Joubert (1, 2, 4)

1 SATIE - Systèmes et Applications des Technologies de l'Information et de l'Energie
2 SATIE-II - Instrumentation et Imagerie
3 UCP - Université de Cergy Pontoise
4 ENS Cachan - École normale supérieure - Cachan

An eddy current imager based on a linear magneto-optical imaging system is presented and implemented for the non-destructive inspection of defects buried in aeronautical riveted lap-joints. Defects of various orientation (−20° to 90°) and length (2 mm to 10 mm), and buried down to 6 mm closely to the rivets in a lap-joint coupon are inspected and analyzed. The provided EC images are processed thanks to a proposed source separation technique involving multi-frequency and multi-orientation images. The proposed image processing enables the quantitative characterization of the defects relatively to their length, depth and orientation.

Mots clés: MAGNETO-OPTIC; EDDY CURRENTS; IMAGING; BURIED DEFECTS; ORIENTED DEFECTS; SOURCE SEPARATION; SIGNAL PROCESSING

Domaines: Sciences de l'ingénieur [physics]

Yohan Le Diraison, Pierre-Yves Joubert. Rotating Field Eddy Current Imaging for the Non-Destructive Evaluation of Buried and Oriented Defects in Riveted Lap-Joints. Sensor letters, 2009, 7 (3), pp.406-411. ⟨10.1166/sl.2009.1062⟩. ⟨hal-00844768⟩