Bi-directional liquid level fiber optic sensor based on a cascaded hollow core fiber structure

Ziyi Huang, Dejun Liu, Long Yan, Qiang Wu, Ke Tian, Changyu Shen, Pengfei Wang

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    Abstract

    A high sensitivity bi-directional liquid level sensor based on a single mode fiber (SMF)-hollow core fiber (air core diameter of $30 { {\mu m}})$-hollow core fiber (air core diameter of $20 {\mu}\mathrm{m})$-SMF (SHHS) structure is reported. The proposed SHHS structure offers two types of radial Fabry-Perot (FP) resonance conditions in silica cladding hence two types of anti-resonant (AR) dips (Dip-20 and Dip-30) are excited in transmission spectra. It is demonstrated that both liquid level and liquid flowing direction can be monitored by simultaneously interrogating the intensity variations of two kinds of AR dips. The maximum liquid level sensitivities of Dip-20 and Dip-30 are estimated to be 0.014 $\text{dB}/{\mu m}$ and 0.005 $\text{dB}/{\mu m}$, respectively.

    Original languageEnglish
    Title of host publicationICOCN 2022 - 20th International Conference on Optical Communications and Networks
    Place of PublicationPiscataway, US
    PublisherIEEE
    ISBN (Electronic)9781665458986
    ISBN (Print)9781665458993
    DOIs
    Publication statusPublished - 12 Aug 2022
    Event20th International Conference on Optical Communications and Networks, ICOCN 2022 - Shenzhen, China
    Duration: 12 Aug 202215 Aug 2022

    Conference

    Conference20th International Conference on Optical Communications and Networks, ICOCN 2022
    Country/TerritoryChina
    CityShenzhen
    Period12/08/2215/08/22

    Keywords

    • Anti resonance
    • Fiber optic sensor
    • Hollow core fiber
    • Liquid level measurement

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