Smaller Diameter Optical Fibre Sensor for Automated Embedding in Composite Laminates
Abstract
In the framework of the FP7-project SMARTFIBER (http://www.smartfiber-fp7.eu/) an optical fibre prototype has been developed with a cladding diameter of approximately 60 µm. Draw Tower fibre Bragg gratings (DTG¬s) are inscribed in this fibre which show identical strain optic and thermo optic characteristics compared to the standard commercial available 125 µm version, moreover they show superb ultimate failure strain of more than 7%. This characteristic plays an important role when automatic fibre embedding processes are envisaged. In this paper, the developed 60 µm fibre prototypes are successfully been applied during automated fibre placement on prepreg material. The results of the calibration tests and of the strain evolution of the DTG¬ during automated fibre placement will be presented in this paper
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