Defects detection of composite materials based on infrared thermography
              LIN Longrong1,2, FU Xibin3, HUANG Xuebin3, CHEN Weiqiang2,ZHANG Qiukun2, ZHONG Shuncong2,4
(1.College of Chengyi, Jimei University, Xiamen 361021,China; 2.School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350108, China; 3.Xiamen Special Equipment Inspection Institute, Xiamen 361000, China; 4.School of Mechatronics Engineering and Automation, Shanghai University, Shanghai 200072, China)

Abstract: Aiming at the problem of internal defects detection of composite materials, two sidebyside five halfplated white halogen tube lamp arrays were used to heat the sample symmetrically, and a highsensitivity infrared camera was used as the detection equipment to build a reflective active infrared thermal imaging system. The system was employed to test the defects of holes and inclusions in carbon fiber resin and glass fiber resin laminate. The reasons for the difference of the surface temperature curves of the two materials were analyzed. The influence of the geometry of the holes on the temperature difference of the sample surface and its causes were analyzed. The reason why the peak temperature difference at the surface of the defect was analyzed. The results indicate that the system achieves good results for defective samples. The temperature curve can be used to proride a reference for subsequent research because of the temperature rariation caused by defect depth and size.

Key words: infrared thermography detection; composite materials; defect detection and recognition