Distributed refractive index sensing based on U-bent fiber through spectral detection of Rayleigh scattering

Pengbai Xu; Liwen Sheng; Jiaqing Liu; Shuai Zhou; Xinyong Dong; Jun Yang; Yuwen Qin

doi:10.1117/12.2600384

18 June 2021 Distributed refractive index sensing based on U-bent fiber through spectral detection of Rayleigh scattering

Pengbai Xu, Liwen Sheng, Jiaqing Liu, Shuai Zhou, Xinyong Dong, Jun Yang, Yuwen Qin

Author Affiliations +

Proceedings Volume 11850, First Optics Frontier Conference; 118501J (2021) https://doi.org/10.1117/12.2600384
Event: First Optics Frontier Conference, 2021, Hangzhou, China

Abstract

We developed a distributed refractive index (RI) sensor based on high performance optical frequency-domain reflectometry (OFDR) by simply bending a piece of standard single mode fiber (SMF) in a U shape. In the U-bent region, cladding modes are excited, which can reach to the boundary of the SMF to sense external RI variation. The cladding modes are then coupled back to the core mode and interfere with the fundamental mode. Thus, the fundamental mode can carry the varied RI information, and distributed index sensing is achieved by measuring the wavelength shifts of the local Rayleigh backscattered spectra. Thanks to the high signal SNR of OFDR, that compensating the bending induced loss, the proposed sensor can be bent in a small bending radius so that a high sensitivity of RI could be achieved. In the experiment, index sensitivity of 39.08 nm/RIU is achieved by imposing a bending radius of 4 mm, when the RI ranges from 1.3330 to 1.3773. Additionally, the proposed sensor maintains buffer coating intact, which boosts its practicability and application flexibility.

Citation Download Citation

Pengbai Xu, Liwen Sheng, Jiaqing Liu, Shuai Zhou, Xinyong Dong, Jun Yang, and Yuwen Qin "Distributed refractive index sensing based on U-bent fiber through spectral detection of Rayleigh scattering", Proc. SPIE 11850, First Optics Frontier Conference, 118501J (18 June 2021); https://doi.org/10.1117/12.2600384

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