Multi-spot Laser Scanning Thermography for Delamination Inspection GFRP Structure in CFRP/GFRP Structure
نویسندگان
چکیده
In this study, a multi-spot laser scanning thermography (MLST) system is developed for automated, rapid and long-range inspection of delamination in composite structures. First, thermal waves are generated by scanning a multi-spot laser beam over a target composite structure, and the corresponding thermal waves are measured by using an infrared (IR) camera. Then a thermal image processing algorithm is developed to detect a hidden delamination based on the premise that abnormal temperature variation will be observed near the hidden delamination due to the differences of diffusion rates between the intact and damage regions. The proposed system provides following advantages for composite structure inspection: (1) complete non-contact, non-destructive, and non-intrusive inspection, (2) long-range inspection, making it possible to inspect a large area, and (3) baselinefree delamination inspection using only current-state infrared data, minimizing false alarms caused by environmental and operational variations. The effectiveness of the proposed MLST system is successfully verified using both a CFRP composite plate and a GFRP wind turbine blade specimen.
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