研究目的
To develop and investigate a micro multimode fiber layer embedded in long period fiber grating for simultaneous measurement of curvature and temperature.
研究成果
The ME-LPFG sensor successfully enables simultaneous measurement of curvature and temperature with high sensitivities and resolutions. It offers advantages such as easy fabrication and low cost, making it suitable for applications in structural health monitoring and other fields. Future work could focus on enhancing performance and broadening applicability.
研究不足
The sensor has larger insertion loss compared to conventional LPFGs due to the added micro MMF layer. The fabrication process, while simpler than some alternatives, still requires precise equipment and may have stability issues. The range of curvature and temperature measurements is limited (0.246–0.738 m-1 and 30–150 °C), and resolutions are moderate (4.7e-5 m-1 and 0.3 °C). Potential areas for optimization include reducing loss, improving fabrication success rate, and extending measurement ranges.
1：Experimental Design and Method Selection:
The ME-LPFG is fabricated using a CO2 laser notched method, involving embedding a micro MMF layer in an LPFG to create a phase-shifted structure for enhanced sensitivity.
2：Sample Selection and Data Sources:
A micro SMS fiber structure is prepared with a 400 μm MMF (diameter 60/125 μm), and the ME-LPFG is written on this structure.
3：List of Experimental Equipment and Materials:
Equipment includes a precision cleaving device, standard welding parameters (Fujitsu, FSM-60S), high-frequency CO2 laser (CO2-H10, Han's Laser), CCD for monitoring, super-continuum light source (SLS), optical spectrum analyzer (OSA, Agilent, AQ6317B, 600–1700 nm), heating device, holders, micrometer, and a 5 g mass. Materials include SMF and MMF fibers.
4：Experimental Procedures and Operational Workflow:
First, prepare the micro SMS structure. Second, write the ME-LPFG with the CO2 laser, placing the MMF layer at the center. Measure transmission spectra using SLS and OSA. For curvature measurement, fix the sensor between holders, apply bending with a micrometer, and calculate curvature. For temperature measurement, place the sensor in a heating device and control temperature.
5：Data Analysis Methods:
Analyze wavelength shifts of resonant peaks using linear regression for sensitivity calculations and matrix inversion method for simultaneous measurement of curvature and temperature.
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