Research on Characteristics of Wedge-Shaped Open-Cavity Mach-Zehnder Sensing Structure for Seawater Temperature

For the purpose of monitoring seawater temperature, a novel Mach-Zehnder (MZ) temperature-sensing structure with a wedge-shaped open cavity is presented and experimentally studied in this article. The open-cavity structure realizes the direct contact between the sensing optical path and the external...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2021, Vol.70, p.1-7
Main Authors: Lin, Zi-Ting, Zhao, Yong, Lv, Ri-Qing, Zheng, Hong-Kun, Wang, Xi-Xin
Format: Article
Language:English
Subjects:
High sensitivity
Loss measurement
low cost
low loss
Mach–Zehnder interferometer (MZI)
Ocean temperature
Optical fiber sensors
Optical fibers
Optical variables measurement
Seawater
Sensitivity
Splicing
Temperature
Temperature measurement
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Summary:For the purpose of monitoring seawater temperature, a novel Mach-Zehnder (MZ) temperature-sensing structure with a wedge-shaped open cavity is presented and experimentally studied in this article. The open-cavity structure realizes the direct contact between the sensing optical path and the external environment, and ensures the high sensitivity of the structure. At the same time, it achieves not only low loss by direct fusion splicing instead of dislocation fusion splicing, but also low cost by hydrofluoric (HF) etching instead of femtosecond processing. In addition, the temperature sensitivity of the sensor structure proposed in this article can reach 1.5 nm/°C without temperature-sensitive material filled, and 6 nm/°C with silicone oil filled. Moreover, the resolution of the sensing structure is 0.24 °C based on the criterion of 3\sigma .
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2021.3088429