The authors have developed a new technique of using distibuted FBG sensors for thermographic detection of flaws in materials and structures. Individual fibers with multiple FBGs employed as temperature sensors can be bonded to the surfaces of structures or embedded in the structures. By applying a thermal heat flux to the surface of the investigated structures, the individual Bragg grating sensors successfully measured the temporal and spatial temperature variations on the surface. These thermal responses were consistent with the results from conventional thermographic techniques. We have also applied this technique on a 10-ply composite with fabricated delaminations of various sizes and depths. With different degrees of success, it has detected the square delaminations with widths of 3.8 cm at depths from 10 % to 50 % of the total thickness. Future efforts will focus on developing the technique with a faster detection system and assessing its potential for performing thermal health monitoring of aerospace structures and materials.
Fiber optic thermographic detection of flaws in composites
Faseroptischer thermographischer Fehlernachweis in Verbundwerkstoff
2009
8 Seiten, 6 Bilder, 9 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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