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基于气体近红外选择性吸收理论和Beer-Lambert定律,研究了硫化氢气体的拉曼散射特性,同时采用宽带光源光谱吸收检测技术对H2S气体进行检测。将自聚焦透镜作为光纤准直透镜和聚焦透镜,并将其应用于透射型气室。同时,提出了在透射式气室中将多对自聚焦透镜组串联使用以增加吸收光程的方法,该方法可以明显提高气室的检测灵敏度。通过分析实验测得的H2S吸收曲线,得到系统的灵敏度为3.672×10-4μW/(μL/L),分辨率为122.5μL/L。
Based on the theory of selective absorption of gas near infrared and Beer-Lambert law, the Raman scattering properties of hydrogen sulfide gas were studied. At the same time, the detection of H2S gas was carried out by the broadband absorption spectroscopy. A self-focusing lens is used as a fiber collimator lens and a focusing lens, and is applied to a transmissive gas cell. In the meantime, a method of using a plurality of pairs of self-focusing lens groups in series in a transmissive gas chamber to increase the absorption optical path length is proposed, which can obviously improve gas chamber detection sensitivity. The sensitivity of the system was 3.672 × 10-4μW / (μL / L) and the resolution was 122.5μL / L by analyzing the experimentally measured H2S absorption curve.