基于紫外吸收光谱技术的混合气体SO_2和H_2S浓度的实时监测

Real-time Monitoring for The Concentrations of SO_2 and H_2S Mixed Gas by Ultraviolet Absorption Spectroscopy Detection Technique

采用紫外波段吸收光谱检测技术,实现了SO2和H2S混合气体各组分浓度的实时监测。在实验中选用氘灯为测试光源,MAYA2000Pro光谱仪用于采集数据。基于光谱的峰谷特性,选择吸收光谱上波长非常接近的两个来推导SO2气体的浓度公式,该方法可以忽略其他气体散射和吸收的影响。H2S气体的吸收光谱可以通过减去混合气体中相应的SO2气体吸收光谱获得。在常温常压下,H2S气体的浓度可以从H2S气体的吸收光谱的吸收峰获得。混合气体的测量精度约为1×10-6(1 ppm)。基于上述方法,实现了混合气体SO2和H2S浓度的实时监测。

By using ultraviolet absorption spectroscopy detection technique, the real-time monitoring for the concentrations of SO2 and H2 S mixed gas was realized. Deuterium lamp was used as a light source, and MAYA2000Pro spectrometer served as spectrograph in the experiment. Based on Beer-Lambert law and absorption spectrum, the formula of SO2 concentration was deduced by choosing very close two points in the absorption spectrum, which could ignore the interference of the scatter-ing and absorption from other gas. The absorption spectrum of H2 S gas can be achieved by subtrac-ting the corresponding absorption spectrum of SO2 gas from mixed gas spectrum. At the normal tem-perature and pressure, the concentration of H2 S could be obtained from the absorption peak of H2 S absorption spectrum. The measuring accuracy of mixed gas is about 1 × 10 ^-6 （1 ppm） . So, our work realizes the real-time monitoring for SO2 and H2 S in mixed gas.