A new rosette-like eddy current array sensor with high sensitivity for fatigue defect around bolt hole in SHM. (March 2018)

• Record Type: Journal Article
• Authors: Chen, Guolong; Zhang, Weimin; Zhang, Zhijing; Jin, Xin; Pang, Weihan
• Is Part Of: NDT & E international. Volume 94(2018)
• Page Start: 70
• Page End: 78
• Publication Date: 2018-03
• Subjects: Structure health monitoring -- Rosette-like eddy current array sensor -- Eddy current testing -- Non-destructive testing; Nondestructive testing -- Periodicals; Contrôle non destructif -- Périodiques; Electronic journals; 620.1127
• DOI: 10.1016/j.ndteint.2017.12.001
• Languages: English
• ISSNs: 0963-8695

Abstract

Abstract: Boosting the sensitivity of eddy current sensors is one of the challenges of non-destructive testing to improve structure health monitoring. Rosette-like eddy current sensors have the best application prospect in structure health monitoring to detect fatigue-induced defects around a bolt hole. To boost the sensitivity of this kind of sensor, a new rosette-like eddy current array sensor is proposed. Same-direction exciting currents are used to make the eddy current distribution more sensitive to detect defect propagation. Moreover, a new layout of pickup coils and a graph algorithm are proposed to improve the sensor's angular resolution. Through finite element simulation and experimental tests, the eddy current distribution and the output signal during defect propagation of a traditional sensor and a new one are compared. Results show that the proposed sensor has higher sensitivity in detecting defect propagation than the traditional one.