An FBG strain sensor for measuring strains to curved surfaces, includes a fiber which is fixed between two securing elements whose undersides are designed as adhesive surfaces, the optical fiber and these securing elements being embedded in a protective compound which consists of a soft silicone rubber or a plastic that has comparable mechanical properties, and the fiber being embedded between an upper and a lower thin sliding film or a sliding tube that consists of Teflon or of a plastic which has a low friction coefficient comparable to Teflon, the underside of the lower sliding film or the lower external surface-line of the sliding tube lying in a plane with the adhesive surfaces of the securing elements.
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