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为了提升光纤拉曼检测系统的响应速度,提出一种基于结构牢固、易于气体扩散的开放式微结构光纤的气体拉曼检测系统。为了深入研究拉曼信号与微结构光纤结构参数的依赖关系,推导出基于前向/后向拉曼耦合的拉曼信号公式,并根据此公式完成对气体光纤拉曼检测系统的结构优化。通过优化光纤结构实现了增强系统灵敏度特性的目的。分析结果表明,拉曼信号强度与光纤结构之间存在一最佳值,最佳值(纤芯、悬臂厚度)取决于基底材料折射率、纤芯直径和悬臂厚度等具体的光纤结构参数。二氧化硅材料光纤的拉曼信号较强区域条件是纤芯厚度为120~150 nm。
In order to improve the response speed of Raman detection system, a gas Raman detection system based on open microstructured fiber with strong structure and easy gas diffusion is proposed. In order to further study the dependence of the Raman signal on the structural parameters of microstructured fiber, a Raman signal formula based on forward / backward Raman coupling is deduced and the structural optimization of the Raman signal detection system based on this formula is completed. By optimizing the optical fiber structure to achieve the purpose of enhancing the sensitivity characteristics of the system. The results show that there is an optimal value between the Raman signal intensity and the fiber structure. The optimal value (core and cantilever thickness) depends on the specific fiber structure parameters such as the refractive index of the substrate material, the core diameter and the cantilever thickness. The Raman signal of the silica material fiber has strong core region of 120-150 nm.