Abstract
The bridge beam-gap between the beam body of the high-speed railway bridge can reach 200–300 mm, and the traditional displacement sensor is inconvenient to measure. A large-range bridge beam-gap displacement sensor based on cantilever beam with fiber Bragg grating (FBG) is proposed in this paper. Based on the structural characteristics of the beam joint, fully utilized the effective space to enlarge the mechanical structure size of the cantilever beam to realize displacement sensing. The cantilever beam displacement sensing is simulated by ANSYS software. The sensor is designed and packaged according to the numerical simulation result. A beam-gap changing device is designed to develop the displacement experiment of the beam-gap. The results show that when the bridge beam-gap displacement varies from 0 to 200 mm, the linear correlation coefficient of the displacement–wavelength curve reaches 0.99852, and the displacement detection sensitivity is 4.53 pm/mm, which meets the requirements of beam-gap displacement monitoring. The sensor is structure simple, easy to package layout, convenient to expand the range by lengthening the cantilever beam, well durability, and suitable for long-term online monitoring applications of large-size beam-gap displacement.
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Lyu, G., Bi, C., Zhang, Y., Wang, C., Wang, M., Jiang, X. (2020). Large-range Bridge Beam-gap Displacement Sensors Based on Cantilever Beam with Fiber Bragg Grating. In: Peng, Y., Dong, X. (eds) Proceedings of 2018 International Conference on Optoelectronics and Measurement. Lecture Notes in Electrical Engineering, vol 567. Springer, Singapore. https://doi.org/10.1007/978-981-13-8595-7_1
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DOI: https://doi.org/10.1007/978-981-13-8595-7_1
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