光学技术在气体浓度检测中的应用

Applications of optical technology in gas concentration detection

阐述了目前气体浓度检测的7种常用光学方法,针对每种光学方法给予了详细的原理说明,列举了各种光学方法现场应用中的优缺点,以及针对光学方法优缺点所做的改进工作,提出了方法改进中的新颖想法,讨论了各种光学方法的结合使用。这其中包括常规光学气体浓度检测方法:光干涉法、光声光谱法、相关光谱法;以及新型光学气体浓度检测方法:可调谐半导体激光吸收光谱法、倏逝场型光纤气体传感法、空芯光子带隙光纤传感法、光纤环衰荡光谱法。结论指出,小型化、智能化、便携式、低功耗、高准确度、快速响应性及分布式多组分遥测技术成为现阶段光学法检测气体浓度的发展趋势。

Seven common optical methods for gas concentration detection are described. The basic principles, advantages and disadvantages of each method are given in detail. The improvement work and some novel ideas are presented. The applications of combined methods are discussed. These optical methods include some conventional gas concentration detection technologies, such as optical interferential method, photoacoustic detection（PAS）, correlation spectroscopy, and some novel gas concentration detection technologies, such as tunable diode laser absorption spectroscopy（TDLAS）, evanescent wave field sensing technology, hollow core photonic bandgap fiber（HC-PBF） sensing technology and fiber loop ring-down spectroscopy（FLRDS）. The prospect of optical gas sensing is listed at the end of the paper, which mainly refers to miniaturization, intelligence, portability, low power consumption, high accuracy, fast response and distributed multi-component telemetry technology.