基于偏振干涉技术的SO2气体检测方法

光谱技术在气体成分分析与检测方面具有独特的优势。对于任意一种特定的气体,其对应的吸收峰都具有独特性,通过光谱吸收峰的强度可以推导待检测气体的浓度。该文基于吸收光谱技术,同时结合光纤衰荡光谱技术,利用光热原理与Sagnac干涉原理,设计出了基于偏振干涉技术的SO气体传感检测系统,此系统具有较强的抗干扰能力,可以实现SO气体的高灵敏度、高分辨率检测。SO的检测实验论证了该文所提的传感检测系统可检测的最小SO浓度约为0.1 ppm。

Spectral technology has unique advantages in gas composition analysis and detection. For any particular gas,its corresponding absorption peak has its own characteristics, and the concentration of the detected gas can be deduced from the intensity of the spectral absorption peak. In this paper, based on absorption spectrum technology, combined with optical fiber ring-down spectrum technology, using the photothermal principle and Sagnac interference principle, the SOgas sensor detection system based on polarized light interference technology is designed. This system has strong anti-interference ability,and can achieve high sensitivity and resolution detection of SOgas. SOdetection experiments demonstrate that the minimum SOconcentration that can be detected by the sensor detection system proposed in this paper is about 0.1 ppm.