研究目的
Investigating the high sensitivity strain sensor based on twin hollow microspheres for strain measurements in harsh environments.
研究成果
The proposed sensor, composed by two-coupled hollow core microspheres, achieves a high strain sensitivity of 3.39 (cid:1) 0.04 PM/με and an average temperature sensitivity of 4.7 (cid:1) 0.5 PM/(cid:3)C. The easy and fast fabrication process, with no chemical hazards, makes it a compelling solution for strain measurements in harsh environments.
研究不足
The temperature response is non-linear due to the multiple effects that occur in the structure, and the temperature sensitivity is around 4 times lower than that achieved for solid microspheres.
1：Experimental Design and Method Selection:
The sensor is fabricated using fusion splicing technique to produce hollow microspheres in the tip of a hollow core fiber (HCF). The resultant structure is a Fabry-Perot interferometer with multiple interferences.
2：Sample Selection and Data Sources:
The samples used are single mode fiber (SMF) and hollow core fiber (HCF).
3：List of Experimental Equipment and Materials:
Sumitomo 71C splicer machine, broadband source of 100 nm bandwidth centered at 1550 nm, optical circulator, and optical spectrum analyzer (OSA) with a resolution of
4：05 nm. Experimental Procedures and Operational Workflow:
The fabrication process involves splicing the SMF to the HCF, forming the microsphere by applying electric arcs, and joining two sensor tips. Strain and temperature characterizations were performed.
5：Data Analysis Methods:
The reflected and transmitted spectra were analyzed using fast Fourier transform (FFT) to determine the main components of the resultant spectrum.
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