基于飞秒光纤光栅的增敏型倾角传感器设计与优化

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Abstract： Aiming at the requirement high-precisiontilt monitoring in the field structural health monitoring （SHM）， this paper proposes a sensitivity-enhanced tilt sensor based on a femtosecond fiber Bragg grating （FBG）. Firstly，structural design the tilt sensor was conducted based on static mechanics principles.By positioning the FBG away from the beam's neutral axis，linear strain enhancement in the FBG was achieved， thereby improving sensor sensitivity. The relationship between FBG strain， applied ce， the fset distance from the neutral axis was established， determining the optimal distance corresponding to maximum strain. Based on this optimization scheme，a prototype the tilt sensor Was designed， fabricated， experimentally tested. Experimental results show that the FBG fset distance yielding maximum sensitivity is 4.4mm .Within a tilt angle range -30∘ to 30∘ ，thesensor achieved a sensitivity 129.95pm/∘ a linearity 0.9997 Compared to conventional FBG-based tilt sensors， both sensitivity linearity were significantly improved. Furthermore， the sensor demonstrated excellent repeatability （error <0.94% ），creep resistance （error <0.30% ）， temperature stability （error <0.90% ）. These results demonstrate the sensor’s excellent potential SHM applications.The sensor has been successfully deployed in an underground pipeline project，conducting long-term monitoring tilt demation in the steel support structures，further proving its value engineering safety monitoring.

words： fiber Bragg grating; tilt sensor; sensitivity-enhanced; femtosecond FBG

摘要：面向结构健康监测领域中的倾角信息高精度监测需求，本文提出了一种基于飞秒光纤光栅的灵敏度增强型倾角传感器。（剩余35034字）