[en] In this paper, we propose and experimentally demonstrate a dual-parameter fiber optic sensor, which combines a Fabry–Perot interferometer (FPI) and a Mach–Zehnder interferometer (MZI) for simultaneous pressure and temperature sensing. The Fabry–Perot (FP) cavity is formed by sandwiching a capillary fiber between a single-mode fiber and a dual-core fiber (DCF). A fluid channel is very close to the central core of the DCF. By precisely drilling micro-air chambers in the annular cladding of a capillary fiber (CF) using a femtosecond laser, external air pressure can directly affect the capillary fiber and induce changes in the refractive index of the air in the CF. The F-P cavity achieves a pressure sensitivity of 3.67 nm/MPa with a temperature cross-sensitivity of 2.82 pm/°C. The MZI is constructed using a dual-core fiber filled with silicone oil in the fluidic channel, which enhances temperature sensitivity through the thermo-optic effect. The MZI sensor exhibits a nonlinear temperature response with an average sensitivity of 103.43 pm/°C. The corresponding pressure cross-sensitivity is about –0.11 nm/MPa. Due to very low cross-sensitivity, simultaneous measurement of temperature and gas pressure is feasible. In addition, we implement a variant by replacing silicone oil with a UV-curable adhesive, which delivers a comparable FP-based pressure sensitivity of ~3.93 nm/MPa while yielding an MZI-based temperature sensitivity of 71.7 pm/°C and potentially improved long-term stability.
Disciplines :
Materials science & engineering
Author, co-author :
Zhu, Tongtong; Research Center for Advanced Optics and Photoelectrics, Department of Physics, College of Science, Shantou University, Daxue Lu 243, Shantou 515063, China
Zhong, Xintong; Research Center for Advanced Optics and Photoelectrics, Department of Physics, College of Science, Shantou University, Daxue Lu 243, Shantou 515063, China
Guo, Xinhao; Department of Civil and Environmental Engineering, College of Engineering, Shantou University, Daxue Lu 243, Shantou 515063, China
Huang, Qipeng; Research Center for Advanced Optics and Photoelectrics, Department of Physics, College of Science, Shantou University, Daxue Lu 243, Shantou 515063, China
Chen, Xiaoyong ; School of Electrical Engineering and Intelligentization, Dongguan University of Technology, Daxue Lu 1, Songshan Lake High-Tech Industrial Development Zone, Dongguan 523808, China
Teng, Chuanxin; Guangxi Key Laboratory of Optoelectronic Information Processing, Guilin University of Electronic Technology, Jinji Lu 1, Qixing District, Guilin 541004, China
Li, Peng-Cheng; Research Center for Advanced Optics and Photoelectrics, Department of Physics, College of Science, Shantou University, Daxue Lu 243, Shantou 515063, China
HU, Xuehao ; Université de Mons - UMONS > Recherche > Service ERC Unit - Advanced Photonic
Qu, Hang; Research Center for Advanced Optics and Photoelectrics, Department of Physics, College of Science, Shantou University, Daxue Lu 243, Shantou 515063, China
Language :
English
Title :
Cascaded MZI and FPI Sensor for Simultaneous Measurement of Air Pressure and Temperature Using Capillary Fiber and Dual-Core Fiber
Research Institute for Materials Science and Engineering
Funders :
Natural Science Foundation of Guangxi Province National Natural Science Foundation of China Dongguan Science and Technology of Social Development Program Special projects in key fields of colleges and universities in Guangdong Province Guangxi Key laboratory of Optoelectronic Information Processing F.R.S.-FNRS - Fonds de la Recherche Scientifique Postdoctoral Researcher Grant (Chargé de Recherches) of Xuehao Hu
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