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 H2S 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 scattering and absorption from other gas.The absorption spectrum of H2S gas can be achieved by subtracting the corresponding absorption spectrum of SO2 gas from mixed gas spectrum.At the normal temperature and pressure,the concentration of H2S could be obtained from the absorption peak of H2S 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 H2S in mixed gas.