High-sensitivity refractive-index-distributed optical fiber sensor based on optical frequency domain reflectometry

Peidong Hua; Zhenyang Ding; Kun Liu; Haohan Guo; Teng Zhang; Sheng Li; Ji Liu; Junfeng Jiang; Tiegen Liu

doi:10.1117/12.2685882

27 November 2023 High-sensitivity refractive-index-distributed optical fiber sensor based on optical frequency domain reflectometry

Peidong Hua, Zhenyang Ding, Kun Liu, Haohan Guo, Teng Zhang, Sheng Li, Ji Liu, Junfeng Jiang, Tiegen Liu

Author Affiliations +

Proceedings Volume 12771, Advanced Sensor Systems and Applications XIII; 127710F (2023) https://doi.org/10.1117/12.2685882
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Abstract

We presented a low-cost, easy-to-fabricate and high-sensitivity distributed refractive index (RI) fiber taper sensor in optical frequency domain reflectometry (OFDR). When the RI of external medium surrounding the tapered fiber changed, the optical frequency shifts of the local back-reflection spectra in OFDR could be measured. We first simulated and derived the relationship between the structure and sensitivity of tapered fiber. Shown the relationship between the radius of the cone waist and sensitivity. And the simulation results were verified through experiments. In the experiments, we demonstrated that high-sensitivity RI measurement of 2970 nm/RIU in the RI range from 1.3347 to 1.3349 for NaCl solutions could be achieved by OFDR system. The spatial resolution was up to 5 mm with the effective sensing region of 5 cm. This is currently the report with the highest sensitivity among distributed RI sensors.

Citation Download Citation

Peidong Hua, Zhenyang Ding, Kun Liu, Haohan Guo, Teng Zhang, Sheng Li, Ji Liu, Junfeng Jiang, and Tiegen Liu "High-sensitivity refractive-index-distributed optical fiber sensor based on optical frequency domain reflectometry", Proc. SPIE 12771, Advanced Sensor Systems and Applications XIII, 127710F (27 November 2023); https://doi.org/10.1117/12.2685882

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