Temperature and strain fiber sensor design based on microstructural Fabry-Perot cavity

The related work on the design and sensing application of Fabry-Perot micro-cavity based on micro-structure fiber was reported, including the design and performance optimization of Fabry-Perot temperature probe with high sensitivity of <10nm/℃, as well as the research progress of the construction of Fabry-Perot cavity on the end of common single mode fiber for measuring strain. We designed the miniature Fabry-Perot interferometer by means of melt heat treatment (for preparing micro/nano-fibers) and polymer packaging (for improving the temperature sensitivity), and used it for exploring the temperature sensor with a high precision, where the resolution can reach 0.002 °C. Fabry-Perot air chamber was constructed at the melting point (splicing location) of two single-mode fibers by glycerin assisted selfexpansion method. The morphology of the Fabry-Perot air chamber was fabricated and optimized by modulating the splicing parameters (drawing process, discharging location, time and intensity) and the fibers’ end-face (plane or arc). The in-line or reflected Fabry-Perot cavities have been applied to determine the tensile strain in the range of 0-1.2 N.