基于腔衰荡技术的光纤双环路一氧化碳浓度监测系统研究

对光纤环形腔技术的传感原理进行了理论推导,并设计了一种双环路一氧化碳浓度测量系统.分析了掺铒光纤放大器在系统中的作用及其增益波动对系统的影响,通过对掺铒光纤放大器的增益进行反馈控制,进一步了提高了测量系统的稳定性和精确性.通过实验,得出了不同浓度的一氧化碳所对应的衰荡曲线.分析了不同浓度的气体对光的吸收特性及衰荡时间与浓度的关系,为实现气体浓度的高准确度在线测量提供了重要的依据.

Dual-loop Carbon Monoxide Concentration Measurement System Based on Cavity Ring-down Technology

The dual-loop carbon monoxide concentration measurement system is introduced based on the sensing principle of fiber loop ring-down spectroscopy technology.The important role of erbium fiber amplifier and the influence of its gain fluctuation on the system are analysed.According to the feedback gain control of the erbium fiber amplifier,stability and precision of the system are further enhanced.The ring-down curves corresponding to different CO concentrations are obtained through experiments.Then,the absorption characteristics of different concentrations and the ralationship between ring-down time and concentration are also analysed,all of which provide an important reference for the high accuracy gas concentration on-line measurement.