Bend Sensor based on Eccentrical Bragg Gratings in Polymer Optical Fibres

Since the first reported inscription of fibre Bragg gratings (FBGs) in polymer optical fibres (POF) in 1999 [1] , they have been employed as sensors for strain, temperature, humidity, pressure or bend measurement [2] , [3] . A new and simple sensor concept is presented here which employs a multimode POF and one or multiple FBGs inscribed in the outer regions of the core to sense bending in 1D and 3D, respectively.