研究目的
To develop a novel method and mechanical configurations for enhancing strain sensitivity and achieving temperature compensation in FBG-based strain sensors, enabling accurate small-amplitude micro-strain monitoring in varying temperature environments.
研究成果
The developed FBG-based strain sensor successfully enhances strain sensitivity (up to 7.72 pm/με) and provides temperature compensation, with good consistency between theoretical, FEM, and experimental results. It enables accurate decoupling of strain and temperature, making it suitable for small-amplitude micro-strain monitoring in varying temperature environments for structural health monitoring applications. Future work could focus on optimizing material properties and expanding the measurement range.
研究不足
The theoretical model made simplifications (e.g., treating lever structures as rods), leading to errors between theoretical, FEM, and experimental results (up to 14.9%). Real material properties (elastic modulus, thermal expansion coefficient) may differ from assumed values, affecting accuracy. The sensor's measurement range is limited to roughly 0-225 με, and it may not be suitable for very large strains or extreme temperatures.
1：Experimental Design and Method Selection:
The study involved designing a sensor with lever structures for strain amplification and temperature compensation, using theoretical models based on elastic mechanics and matrix methodology, validated through FEM and experimental tests.
2：Sample Selection and Data Sources:
A sensor specimen was fabricated with specific dimensions (36 × 10 × 1 mm3) using materials like stainless steel 304 and silica fiber. Data were collected from uniform strength cantilever beams and temperature-controlled environments.
3：List of Experimental Equipment and Materials:
Equipment includes an FBG interrogator (GAUSSIAN OPTICS), thermocouple (Omega5LSC-GG-J-24-36), uniform strength cantilever beam, temperature-controlled tank, and materials such as adhesive (ND353), stainless steel substrate, and optical fibers.
4：Experimental Procedures and Operational Workflow:
For strain amplification, the sensor was bonded to a beam, forces were applied (0-68.6 N), and wavelength shifts were measured. For temperature sensing, the sensor was placed in a temperature-controlled tank, temperatures were varied (40-70°C), and wavelength shifts and temperatures were recorded.
5：6 N), and wavelength shifts were measured. For temperature sensing, the sensor was placed in a temperature-controlled tank, temperatures were varied (40-70°C), and wavelength shifts and temperatures were recorded.
Data Analysis Methods:
5. Data Analysis Methods: Data were analyzed using linear fitting to determine sensitivities, and decoupling equations were applied to separate strain and temperature effects.
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