研究目的
Investigating the fabrication and characterization of a sapphire fiber Bragg grating (SFBG) using femtosecond laser line-by-line scanning method for high temperature and strain sensing applications.
研究成果
The SFBG fabricated by the line-by-line scanning method exhibits higher reflectivity and stable temperature and strain response up to 1600°C, demonstrating its potential for embedded temperature and strain sensing in harsh environments such as aero-engine and space craft structural health monitoring.
研究不足
The signal-to-noise ratio (SNR) of the SFBG reflection peak is reduced by the strong background light generated by the black body radiation at temperatures above 1400°C.
1：Experimental Design and Method Selection:
The SFBG was fabricated using a femtosecond laser line-by-line scanning method. A third-order fiber Bragg grating was inscribed in a single crystal sapphire fiber with a diameter of 60 μm.
2：Sample Selection and Data Sources:
A 20 cm sapphire fiber with a diameter of 60 μm was used.
3：List of Experimental Equipment and Materials:
Femtosecond laser (Light-Conversion Pharos), high numerical aperture 60x oil immersion objective (Olympus, NA =
4：42), assembled five-axis processing platform (Aerotech ABL10050L-LN/UPPER and BOCIC MRS100 Series), B-type thermocouple, testing machine (WDW-100). Experimental Procedures and Operational Workflow:
The fs laser pulses were focused within the sapphire fiber placed on the processing platform. The SFBG was written in the middle of the fiber with a track length of 40 μm. The temperature and strain sensing characteristics were tested from room temperature to 1600°C and at different temperatures, respectively.
5：Data Analysis Methods:
The relationship between the resonance wavelength and temperature/strain was analyzed using quadratic function fitting and linear fitting.
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