Simultaneous measurement of temperature and liquid refractive index based on fiber open Fabry-Pérot cavity and Bragg grating
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College of Science, Xi’an Shiyou University, Xi’an 710065, China

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    Abstract:

    A temperature and refractive index sensor based on fiber Bragg grating (FBG) end surface cascade open Fabry-Pérot (FP) cavity has been designed and demonstrated experimentally. The open FP cavity has been fabricated on the end face of an FBG by dislocation fusion in this work, the open FP cavity could be used for refractive index sensing, and the temperature is measured by the FBG. The working principle of the sensor and the method of improving the sensitivity are analyzed by theoretical simulation. The refractive index sensitivity of the sensor is 1 108.4 nm/RIU, while the maximum fluctuation of the sensor stability experiment detection is 0.005 nm. The results show that it has satisfactory characteristics. The sensor is a compact all-fiber structure, so it has potential applications in the field of temperature refractive index sensing, such as biomedical and capacitor electrolyte detection.

    Reference
    [1] LI X, LI F, ZHOU X, et al. Optic fiber DNA biosensor with temperature monitoring based on double microcavities Fabry-Perot interference and Vernier combined effect[J]. IEEE transactions on instrumentation and measurement, 2023, 1(72):1-8.
    [2] ZHAO Q, LIU J, YANG H, et al. Double U-groove temperature and refractive index photonic crystal fiber sensor based on surface plasmon resonance[J]. Applied optics, 2022, 61(24):7225-7230.
    [3] FEI Y, CUI T, MA C H, et al. Fiber optic sensors based on circular and elliptical polymer optical fiber for measuring refractive index of liquids[J]. Optical fiber technology, 2022, 68:102812.
    [4] QIAO S Y, CHEN X L, JIANG S, et al. Plasmonic fiber-optic sensing system for in situ monitoring the capacitance and temperature of supercapacitors[J]. Optics express, 2022, 30(15):27322-27332.
    [5] QIAN S, CHEN X, JIANG S, et al. Direct detection of charge and discharge process in supercapacitor by fiber-optic LSPR sensors[J]. Nanophotonics, 2020, 9(5):1071-1079.
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LIU Qinpeng, WANG Danyang, LI Xingrui, GAO Hong, YU Dakuang. Simultaneous measurement of temperature and liquid refractive index based on fiber open Fabry-Pérot cavity and Bragg grating[J]. Optoelectronics Letters,2024,20(8):477-482

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History
  • Received:November 11,2023
  • Revised:April 03,2024
  • Online: July 24,2024
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