研究目的
To enhance the sensitivity of fluorophore-doped POF stress sensors for visual detection of stress by optimizing waveguide conditions and evaluating the effects of structural features.
研究成果
The study demonstrated that waveguide optimization, particularly through a double-cladding structure, effectively enhances the sensitivity of fluorophore-doped POF stress sensors. The shape of the Coumarin 540A-attributed peak was identified as a key factor in sensor sensitivity, offering a pathway for future improvements in visual stress detection applications.
研究不足
The sensor response did not show linearity with respect to the numerical aperture, indicating limitations in tuning sensitivity solely through NA adjustments. The study also highlights the need for further optimization to achieve pronounced color changes detectable by the human eye.
1：Experimental Design and Method Selection:
The study involved fabricating fluorophore-doped POFs with varying numerical apertures and analyzing their response to stress through macrobending.
2：Sample Selection and Data Sources:
POFs doped with Coumarin 540A and Rhodamine 6G in the core and cladding, respectively, were used.
3：List of Experimental Equipment and Materials:
Equipment included a preform analyzer, a 406 nm laser diode, XYZθ aligner, NFP camera, and spectrophotometer. Materials included PMMA-based POFs, Coumarin 540A, Rhodamine 6G, and diphenyl sulfide.
4：Experimental Procedures and Operational Workflow:
POFs were fabricated from preforms, characterized for refractive index profiles, and subjected to stress via macrobending. The response was analyzed through spectral analysis and NFP observation.
5：Data Analysis Methods:
The changes in fluorophore peaks under stress were analyzed to evaluate sensor sensitivity.
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