摘要
波导式光学吸收池在气体浓度测量等领域有广泛的应用前景。本文理论分析了在普通扩散环境和压差环境下波导式光学吸收池的时间响应机理和特性,并搭建了相应的传感系统,优化系统结构进行了实验验证。通过对低浓度的甲烷和甲苯气体的测量实验,验证和修正了响应时间的理论模型。实验结果表明,优化系统在可以大幅降低响应时间的同时,保持较高的灵敏度,为波导式吸收池的设计与优化提供了重要的参考。
Optical waveguides have a promising application as absorption cells in concentration measurement for gases.Mechanism and properties of the time response for the waveguide absorption cell were theoretically analyzed based on the diffusion and hydrodynamic theories.Two measuring systems corresponding to the diffusion and hydrodynamic applications were established by using Fourier transform infrared spectroscopy（FTIR） equipment,Ultraviolet and visible（UV-VIS） spectroscopy and specially fabricated low-loss hollow fiber as the absorption cell.A modified calculation model was proposed based on the measured data of dynamics methane and toluene gas flow at low concentration level.Experimental results show that response time can be dramatically shortened by optimizing the structure of the waveguide cell while maintaining a high sensitivity in gas sensing.And the characterization results provide useful guidance for the design and application for gas sensor using hollow waveguides as absorption cells.
出处
《光电工程》
CAS
CSCD
北大核心
2012年第4期114-120,共7页
Opto-Electronic Engineering
基金
国家自然科学基金(60971014)资助项目
