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提出利用结构牢固、易于气体扩散的开放式微结构光纤提升Raman检测系统的响应速度,并根据前向/后向Raman耦合的Raman信号公式对液体光纤Raman检测系统结构进行了优化。分析表明,存在一最佳的悬挂芯光纤纤芯半径,使得耦合接收的Raman信号最佳;较细的悬臂厚度有利于提高耦合接收的Raman信号强度;随着流体折射率值的增加,最佳纤芯半径有所增加,而且相应的Raman信号有所下降。此外,还分析了封闭式悬挂芯光纤和纳米光纤结构与Raman强度的相互关系,并对3种结构的Raman特性进行了对比。
The response speed of Raman detection system is improved by using open microstructure fiber with strong structure and easy gas diffusion. The structure of liquid Raman detection system is optimized according to Raman signal formula of forward / backward Raman coupling. The analysis shows that there exists an optimal fiber core radius of the suspension core, which makes the Raman signal coupled and received the best. The thinner cantilever thickness is advantageous to improve the Raman signal intensity of the coupling and reception. As the refractive index of the fluid increases, the optimum The core radius is increased, and the corresponding Raman signal is decreased. In addition, the relationship between Raman intensity and the closed-core fiber and nano-fiber structure was also analyzed. The Raman characteristics of the three structures were also compared.