Measurement of distributed refractive index through Rayleigh backscattering spectra detection using a U-bent common fiber

Shan Qiao; Liwen Sheng; Ping Song; Aiguo Zhang; Honglong Guo; Peng Li; Jinpeng Lang; Hui Jin; Tianyang Qu

doi:10.1117/12.2600768

31 August 2021 Measurement of distributed refractive index through Rayleigh backscattering spectra detection using a U-bent common fiber

Shan Qiao, Liwen Sheng, Ping Song, Aiguo Zhang, Honglong Guo, Peng Li, Jinpeng Lang, Hui Jin, Tianyang Qu

Author Affiliations +

Proceedings Volume 11907, Sixteenth National Conference on Laser Technology and Optoelectronics; 1190704 (2021) https://doi.org/10.1117/12.2600768
Event: Sixteenth National Conference on Laser Technology and Optoelectronics, 2021, Shanghai, China

Abstract

We propose and experimentally validate a distributed refractive index (RI) sensor obtained by simply bending a piece of standard single mode fiber (SMF) to a radius of curvature in several millimeters with intact buffer coating. The RI of the external medium surrounding the U-bent optical fibers is measured by the wavelength shifts of the local Rayleigh backscattered spectra when the RI ranges from 1.3330 to 1.3773. To demonstrate the ability of distributed RI sensing based on the proposed method, this presented sensing element is employed to measure multipoint RI variations at the same time. The sensitivities are about 19.61nm/RIU (RI units), 27.59nm/RIU and 39.08nm/RIU in the proposed structure, respectively.

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Shan Qiao, Liwen Sheng, Ping Song, Aiguo Zhang, Honglong Guo, Peng Li, Jinpeng Lang, Hui Jin, and Tianyang Qu "Measurement of distributed refractive index through Rayleigh backscattering spectra detection using a U-bent common fiber", Proc. SPIE 11907, Sixteenth National Conference on Laser Technology and Optoelectronics, 1190704 (31 August 2021); https://doi.org/10.1117/12.2600768

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