Crack length quantification based on planar eddy-current sensor array and two-dimensional image

• 作 者: Liu Lihui Tian Wugang Pan Mengchun* Chen Dixiang Xie Ruifang Ren Yuan
• 机 构: College of Mechatronics and Automation, National University of Defense Technology, Changsha 410073,
• 出 处: Transactions of Nanjing University of Aeronautics & Astronau
• 发表日期: 0年期

Eddy-current (EC) testing is an effective electromagnetic non-destructive testing (NDT) technique. Planar eddy-current sensor arrays have several advantages such as good coherence, fast response speed and high sensitivity, which can be used for micro-damage inspection of crucial parts in mechanical equipments and aerospace aviation. The main purpose of this research is to detect the defect in a metallic material surface and identify the length of crack using planar eddy-current sensor arrays in different directions. The principle and characteristics of planar eddy-current sensor arrays are introduced in this paper, and a crack length quantification algorithm in different directions was investigated. A damage quantitative detection system was established based on a field programmable gate array and ARM processor. The system was utilized to inspect the micro defect in a metallic material, which was carved to micro crack with size of 7 mm (length) × 0.1 mm (width) × 1 mm (depth). The experiment data show an excellent repeatability of the length measurement with the sensor arrays, and the uncertainty of the length measurement is below ? 0.2mm.

Eddy-current (EC) testing is an effective electromagnetic non-destructive testing (NDT) technique. Planar eddy-current sensor arrays have several advantages such as good coherence, fast response speed and high sensitivity, which can be used for micro-damage inspection The crucial purpose of this research is to detect the defect in a metallic material surface and identify the length of crack using planar eddy-current sensor arrays in different directions. The principle and characteristics of planar eddy -current sensor arrays are introduced in this paper, and a crack length quantification algorithm in different directions was investigated. A damage quantitative detection system was established based on a field programmable gate array and ARM processor. The system was utilized to inspect the micro defect in a metallic material, which was carved to micr o crack with size of 7 mm (length) × 0.1 mm (width) × 1 mm (depth). The experiment data show an excellent repeatability of the length measurement with the sensor arrays, and the uncertainty of the length measurement is below 0.2 mm.