Submitting Campus
Daytona Beach
Department
Civil Engineering
Document Type
Conference Proceeding
Publication/Presentation Date
2015
Abstract/Description
Thermal imaging is a well-established technique for the non-destructive evaluation of FRP composites applied to reinforced concrete. Defect characterization using IR thermography, however, remains a topic of on-going research, and there are currently no universally accepted standards for data collection or interpretation. This research involved large scale thermography inspection of two FRP strengthened bridge girders that were removed from service after approximately 10 years of service in a potentially corrosive marine environment. Trial inspections were performed on test areas where defects could be identified using sounding methods. Two procedures showed the most promise for identifying and characterizing defects: sinusoidal (lock-in style) heating with periods ranging from 5 s to 40 s and constant step heating for 30 s followed by 60 s of cooling. Both methods resulted in a series of phase images that provided insight into the depth and general nature of detected defects. This paper presents the findings of a comparison study between these two thermal imaging techniques.
Publication Title
Thermosense: Thermal Infrared Applications XXXVII; Proceedings of SPIE Vol. 9485
DOI
https://doi.org/10.1117/12.2177260
Publisher
SPIE
Scholarly Commons Citation
Brown, J., & Chittineni, S. H. (2015). Comparison of Lock-in and Pulse-Phase Thermography for Defect Characterization in FRP Composites Applied to Concrete. Thermosense: Thermal Infrared Applications XXXVII; Proceedings of SPIE Vol. 9485, 9485(). https://doi.org/10.1117/12.2177260
Included in
Civil and Environmental Engineering Commons, Electromagnetics and Photonics Commons, Materials Science and Engineering Commons