Strain Sensitivity of FBG Sensor Probe for Monitoring of Wind Turbine Blade Composites

摘要

Wind turbine usually uses composite blades because composite materials can give high specific stiffness and strength. However, these composite blades have failed by several damage factors, such as adhesive bond failure, tip deflection hit tower, and foreign object impact, and so on. If the strain of the blade is able to be measured continuously, it is possible to prevent severe damages caused by tip deflection hit tower, and adhesive bond failure. Fiber optic sensors are developed to monitor wind turbine blade integrity by several research teams. Therefore, in this work, fiber optic FBG (fiber Bragg grating) sensor probes are designed and fabricated to measure the strains on the inner-surface of composite blades. Also, the strain sensitivities of the FBG probes due to the thickness of adhesive layer are investigated by performing tensile test of the FBG probe attached on the surface of aluminum specimen.