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Temperature–insensitive curvature sensor based on hollow-core fiber assisted microbubble Mach–Zehnder interferometer

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Abstract

A compact fiber-optical curvature sensor based on the hollow-core fiber (HCF) assisted microbubble Mach–Zehnder interferometer (HMZI) is proposed and experimentally demonstrated. Transmission spectral characteristics of the proposed curvature sensor have been investigated with a maximum intensity-interrogated sensitivity of − 1.48 dB/m−1 in a curvature range from 1.22 m−1 to 3.46 m−1. The temperature-induced instability is measured below 0.30 dB in a large temperature range of 35 °C to 60 °C, suggesting a good temperature resistance performance. The overall sensing size is controlled to be around 600 μm. Hence, the HMZI curvature sensor has several desirable merits such as wide measurement range, temperature insensitivity, and ease of integration, which make it a promising candidate in curvature-related mechanical engineering and structural health monitoring applications.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Acknowledgements

This work is financially supported by the National Natural Science Foundation of China (62205131, 62105307), Natural Science Foundation of Jiangsu Province (BK20220519). Major Basic Research Project of the Natural Science Foundation of the Jiangsu Higher Education Institutions (22KJB140002), China Postdoctoral Science Foundation (2022M721378, 2023M741435).

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Authors and Affiliations

  1. Department of Optoelectronic Information Science and Engineering, Jiangsu University, Zhenjiang, 212013, China

    Mingyang Chen, Xinqi Su, Tianyi Gong, Zijie Dai & Ying Liang

  2. Tianjin Navigation Instruments Research Institute, Tianjin, 300131, China

    Hu Liang

Authors
  1. Mingyang Chen
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  2. Xinqi Su
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  3. Tianyi Gong
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  4. Hu Liang
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  5. Zijie Dai
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  6. Ying Liang
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Contributions

Conceptualization: YL, MC; methodology: YL, TG; writing—original draft preparation: XS; writing—review and editing: YL, ZD, XS; formal analysis and investigation: YL, MC; funding acquisition: ZD, HL; software: HL, XS; data curation: XS, ZD; all the authors reviewed the manuscript.

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Correspondence to Ying Liang.

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Chen, M., Su, X., Gong, T. et al. Temperature–insensitive curvature sensor based on hollow-core fiber assisted microbubble Mach–Zehnder interferometer. Appl. Phys. B 130, 57 (2024). https://doi.org/10.1007/s00340-024-08193-1

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