Abstract
A polydimethylsiloxane (PDMS) coated fiber-optic sensor based on the Mach–Zehnder interference is presented. The sensor is composed of multimode fiber, thin-core fiber, and no-core fiber. Owing to the different cladding and core sizes of the three fibers, the Mach–Zehnder interference and strong external evanescent wave are generated. To improve the temperature sensitivity, we introduce the PDMS with high thermal expansion coefficient and high negative thermo-optic coefficient into the sensor. Results show that the temperature sensitivity of the original fiber-optic sensor is 0.0177 dB/℃ in the range of 40–80℃. After coating PDMS, the temperature sensitivity of the proposed sensor is improved to 0.0356 dB/℃. At the same time, the heating and cooling experiments and the long-time temperature testing are performed to demonstrate the repeatability and stability of the sensor. Owing to its excellent performances, the proposed sensor exhibits a great potential in the temperature sensing application.
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Wu, H., Xu, M., Chen, Q. et al. Polydimethylsiloxane Encapsulated MMF-TCF-NCF SENSOR with High and Stable Temperature Sensitivity. J Russ Laser Res 44, 61–67 (2023). https://doi.org/10.1007/s10946-023-10108-y
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DOI: https://doi.org/10.1007/s10946-023-10108-y