Long-period gratings for selective monitoring of loads on a wind turbine blade.

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Journal Article
Applied optics, 2014, 53 (18), pp. 3993 - 4001
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An optical fiber sensor based on long-period gratings (LPG) for selective measurements of flap- and edge-wise bending of a wind turbine blade is presented. Two consecutive LPGs separated by 40 mm interfere to improve resolution and reduce noise in a D-shaped fiber. The mode profile of the device was characterized experimentally to provide a model describing the mode couplings. The sensor was tested on a wind turbine blade.
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