Embedded fiber Bragg grating strain sensor with enhanced sensitivity

Li Xiong; Guozhang Jiang; Yongxing Guo; Shuang Xu

doi:10.1117/12.2538084

20 November 2019 Embedded fiber Bragg grating strain sensor with enhanced sensitivity

Li Xiong, Guozhang Jiang, Yongxing Guo, Shuang Xu

Proceedings Volume 11191, Advanced Sensor Systems and Applications IX; 1119114 (2019) https://doi.org/10.1117/12.2538084
Event: SPIE/COS Photonics Asia, 2019, Hangzhou, China

Abstract

In engineering practice, especially in the structural health monitoring (SHM) of civil engineering, the deformation of concrete is usually small, so a strain sensor don’t need a large measuring range but a high sensitivity. This work presents the structural design, measuring and sensitization principle, and full test of an embedded FBG strain sensor for SHM of reinforced concrete. Two capillary steel tubes protected by a stainless steel tube and embedded with each end fiber of a FBG have been proposed, which possesses the capacity of strain sensitization and adjustment. Experimental results show that sensor provides a sensitivity of 4.2 pm/με in measurement range of ±300με, which is 3.5 times than the bare FBG with center wavelength of 1550 nm. Test results also demonstrate that the sensor possesses good repeatability and creep resistance, which is promising for applications in civil engineering.

Citation Download Citation

Li Xiong, Guozhang Jiang, Yongxing Guo, and Shuang Xu "Embedded fiber Bragg grating strain sensor with enhanced sensitivity", Proc. SPIE 11191, Advanced Sensor Systems and Applications IX, 1119114 (20 November 2019); https://doi.org/10.1117/12.2538084

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