研究目的
To fabricate a fiber Bragg grating (FBG)-based Fabry–Perot (FP) structure in an adiabatic fiber taper using femtosecond laser micromachining and investigate its strain and temperature characteristics compared to a standard polyimide coated FBG sensor.
研究成果
The fabricated FBG-based FP sensor in an adiabatic fiber taper demonstrates higher strain sensitivity (2.32 pm/με) compared to a standard FBG (0.73 pm/με), with similar temperature sensitivity (8.85 pm/?C). This sensor is suitable for applications requiring precise strain detection in harsh environments.
研究不足
The study is limited to the fabrication and testing of the sensor in controlled laboratory conditions. Further testing in real-world harsh environments is needed to validate long-term stability and durability.
1：Experimental Design and Method Selection:
Simulation of the FP structure followed by fabrication of an adiabatic fiber taper and direct inscription of the sensing structure using infrared femtosecond laser micromachining.
2：Sample Selection and Data Sources:
Adiabatic fiber taper with outer diameter reduced to 70 μm and core diameter to
3：7 μm. List of Experimental Equipment and Materials:
SMF (Corning SMF-28 Ultra Optical Fiber), fs-laser micromachining set-up (Newport Corp.), Ti:sapphire laser source (Spectra-Physics), FBG interrogator (si155, from Micron Optics).
4：Experimental Procedures and Operational Workflow:
Fabrication of the fiber taper using flame brushing technique, inscription of the sensing structure within the core using fs-laser, strain and temperature testing.
5：Data Analysis Methods:
Linear regression analysis of sensor response to strain and temperature.
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