Structural monitoring by use of a Brillouin distributed sensor

The testing of a fiber-optic distributed-strain sensor attached to a simple structural member is reported. A Brillouin scattering-based sensor system was used to measure both tensile and compressive strains along the length o f a cantilever beam subjected to various loads. The sensing fiber was attac hed to the beam in such a way that some sections experienced uniform strain , whereas others were subjected to a nonuniform strain distribution. A spat ial resolution of 0.4 m was used, and a measurement precision of approximat ely +/-50 mu epsilon was achieved. (C) 1999 Optical Society of America.