Fiber optic refractive index sensor based on tapered capillary

Cheng Zhang; Jing Yang; Guanghuan Cui; Zheng Sun; Yafeng Zhao; Jixuan Wu; Shanshan Zhang; Junfa Zhao; Hua Bai; Changyun Miao

doi:10.1117/12.2605892

1 November 2021 Fiber optic refractive index sensor based on tapered capillary

Cheng Zhang, Jing Yang, Guanghuan Cui, Zheng Sun, Yafeng Zhao, Jixuan Wu, Shanshan Zhang, Junfa Zhao, Hua Bai, Changyun Miao

Author Affiliations +

Proceedings Volume 12057, Twelfth International Conference on Information Optics and Photonics; 120572H (2021) https://doi.org/10.1117/12.2605892
Event: Twelfth International Conference on Information Optics and Photonics, 2021, Xi'an, China

Abstract

A fiber optic refractive index sensor based on tapered capillary is proposed. A multimode interferometer generated by annular high-order mode is fabricated by fused thin-walled capillary between single-mode fibers, which has high refractive index sensitivity. The experimental results show that the sensor has a piecewise-linear refractive index response with gradually increasing sensitivity in the range of 1.3328~1.4553. It is found that the increase of capillary length is beneficial to the increase of refractive index sensitivity. For the sample with 10 mm capillary, the RI sensitivity is up to 7474.959 nm/RIU, the temperature sensitivity is only 9.48 pm/°C and the measurement error is ±2.12×10^-3. The results show that the sensor has good accuracy and repeatability in refractive index measurement. The sensor is suitable for high refractive index range in biological process monitoring, where high refractive index sensitivity and low temperature cross sensitivity are required.

Citation Download Citation

Cheng Zhang, Jing Yang, Guanghuan Cui, Zheng Sun, Yafeng Zhao, Jixuan Wu, Shanshan Zhang, Junfa Zhao, Hua Bai, and Changyun Miao "Fiber optic refractive index sensor based on tapered capillary", Proc. SPIE 12057, Twelfth International Conference on Information Optics and Photonics, 120572H (1 November 2021); https://doi.org/10.1117/12.2605892

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