研究目的
To develop a high-sensitivity strain sensor using a novel TCF-PCF-TCF structure in a Mach-Zehnder interferometer for applications in health monitoring, aerospace, and nanotechnology.
研究成果
The proposed MZI strain sensor with TCF-PCF-TCF structure achieves high sensitivity (-1.89 pm/με), large measurement range (up to 4000 με), and low temperature sensitivity (5.58 pm/°C), with advantages in simplicity, cost, and size. It shows potential for strain sensing applications, with recommendations for further optimization in temperature independence and mechanical robustness.
研究不足
The strain sensitivity is weekly dependent on PCF length but not strongly on wavelength. Temperature effects, though low, could affect measurements if variations exceed 16°C, limiting use in environments with large temperature fluctuations. The fabrication requires precise splicing, which might be challenging without specialized equipment.
1：Experimental Design and Method Selection:
The experiment involved designing a Mach-Zehnder interferometer (MZI) with a TCF-PCF-TCF structure to measure strain. The theoretical model included interference equations and sensitivity calculations based on phase differences and effective refractive indices.
2：Sample Selection and Data Sources:
Samples were fabricated using specific fibers: TCF (460-HP from Nufern), PCF (LMA-10 from NKT Photonics), and SMF (SMF-28e from Corning). Data were collected from transmission spectra changes under applied strain and temperature variations.
3：List of Experimental Equipment and Materials:
Equipment included a fusion splicer (FSM 80S from Fujikura), fiber cleaver, broadband ASE source (wavelength range 1528–1602 nm), and optical spectrum analyzer (OSA, Agilent 86142B, wavelength range 600–1700 nm, resolution 0.01 nm). Materials were the specified optical fibers.
4：01 nm). Materials were the specified optical fibers.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Fibers were spliced together with optimized discharge power, time, and overlap. Strain was applied using translation stages, moving in 10 μm increments, and transmission spectra were recorded in real time. Temperature tests were conducted in a controlled container.
5：Data Analysis Methods:
Data were analyzed using linear fitting to determine strain and temperature sensitivities, with R2 values calculated for goodness of fit. Comparisons were made with other sensor types from literature.
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