Dual-Parameter Fiber Sensors for Salinity and Temperature Measurement Based on a Tapered PMF Incorporated With an FBG in Sagnac Loop

A flexible and stable optical fiber sensor based on the Sagnac loop is proposed and experimentally demonstrated for the measurement of salinity and temperature, simultaneously. The sensing unit consists of a tapered polarization maintaining fiber (tPMF) and a fiber Bragg grating (FBG) connected in s...

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Bibliographic Details
Published in:IEEE photonics journal 2024-02, Vol.16 (1), p.1-7
Main Authors: Liu, Yuhui, Lin, Weihao, Zhao, Fang, Zhang, Xuming, Shao, Li-Yang
Format: Article
Language:English
Subjects:
Birefringence
Bragg gratings
Dual-parameter sensors
Optical fiber sensors
Optical fibers
Parameter sensitivity
Sagnac interferometers
Sagnac loop
Salinity
Salinity (geophysical)
salinity sensors
Sensors
Temperature compensation
Temperature measurement
Temperature sensors
tPMF
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Summary:A flexible and stable optical fiber sensor based on the Sagnac loop is proposed and experimentally demonstrated for the measurement of salinity and temperature, simultaneously. The sensing unit consists of a tapered polarization maintaining fiber (tPMF) and a fiber Bragg grating (FBG) connected in series in the Sagnac loop. The temperature response comes from the high birefringence of PMF inside Sagnac loop, and the salinity response is enabled by the high-order modes excited in the tapered area of PMF. Besides, the FBG is for temperature compensation. We have succeeded in implementing dual-parameter measurements with the sensitivities of 0.356 nm/‰ for salinity and 0.616 nm/°C for temperature, respectively. The designed sensor has the potential for long-term monitoring of real ocean states.
ISSN:1943-0655
1943-0647
DOI:10.1109/JPHOT.2024.3351092