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(a) Back-scattering mechanism due to fiber core impurities, (b) view of the fiber-optic sensor glued to a steel rebar, (c) sketch of the fiber optical cable placed in the groove and adhering to the steel due to two-component glue and (d) description of the fiber optic cable structure with angle polished connector on one side and termination (which avoids light reflection) on the opposite [78].
