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Monitoring of beam deflection subjected to bending load using Brillouin distributed optical fiber sensors

Distributed optical fiber sensors are effective in the monitoring of large structures because of their large sensing range. In this research, the methods of strain and deflection measurement for bending beams using Brillouin distributed optical fiber sensors were presented. The deflection monitoring of beams makes possible the damage detection of large structures such as bridges. The measured strain with Brillouin distributed optical fiber sensors is expressed as the averaged value within its spatial resolution. Due to the characteristic of the spatial resolution, strain near the ends of a measurement range cannot be correctly measured with respect to the measuring position. Therefore, its compensation is required. The strain measurement method suitable to the sensor characteristic was proposed, and it was verified by the analysis of aluminum-tube beams. The beam deflection could be monitored using the distributed measurement more simply and effectively than using general point-measurement.