研究目的
Investigating the bending strain and low frequency vibration characteristics of few-layers graphene-coated excessively tilted fiber grating (ExTFG).
研究成果
The study concludes that few-layers graphene-coated ExTFG exhibits improved stability and mechanical performance, albeit with a decrease in sensitivity. The proposed sensor shows potential for applications in optical fiber strain, torsion, and vibration sensors, offering a stronger structure and easier fabrication for practical engineering applications.
研究不足
The study notes that the graphene coating improves the stability and mechanical characteristics of ExTFG at the expense of sensitivity. The reduction in sensitivity, especially for TE mode vibration acceleration sensitivity, indicates a trade-off between mechanical enhancement and sensing performance.
1：Experimental Design and Method Selection:
The study involved analyzing the static bending strain and low frequency vibration sensing characteristics of few-layers graphene-coated ExTFG. Theoretical models and experimental methods were employed to measure the strain sensitivities of TE and TM modes based on wavelength and intensity variations.
2：Sample Selection and Data Sources:
The samples included uncoated ExTFG and graphene-coated ExTFG. Data was acquired through experimental measurements of bending strain and vibration responses.
3：List of Experimental Equipment and Materials:
Equipment included a tunable laser light source (TLS), optical isolator (ISO), polarizer, polarization controller (PC), and PZT for vibration loading.
4：Experimental Procedures and Operational Workflow:
The experimental setup involved using a TLS to provide a laser signal that reached ExTFG through an ISO, polarizer, and PC. The signal was amplified to drive PZT, loading vibration on an equal intensity cantilever beam.
5：Data Analysis Methods:
The bending strain sensitivities were calculated based on wavelength and intensity changes. Vibration acceleration sensitivities were measured at different wavelength points of TE and TM modes.
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