| Citation: | Nutsuglo Theophilus, GUO Yong-xing, ZHOU Wan-huan, YU Hai-sheng, REN Ru-hua, SHEN Shun-an. Design optimization of a sensitivity-enhanced tilt sensor based on femtosecond fiber bragg grating[J]. Chinese Optics, 2025, 18(4): 908-920. doi: 10.37188/CO.EN-2024-0034
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Aiming at the requirement for high-precision tilt monitoring in the field of structural health monitoring (SHM), this paper proposes a sensitivity-enhanced tilt sensor based on a femtosecond fiber Bragg grating (FBG). Firstly, structural design of 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 force, and the offset distance from the neutral axis was established, determining the optimal distance corresponding to maximum strain. Based on this optimization scheme, a prototype of the tilt sensor was designed, fabricated, and experimentally tested. Experimental results show that the FBG offset distance yielding maximum sensitivity is 4.4 mm. Within a tilt angle range of −30° to 30°, the sensor achieved a sensitivity of 129.95 pm/° and a linearity of
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