CS2是一种有毒气体,具有极难闻气味,对人体的伤害非常大。我国多个大城市要求对环境中的CS2进行准确、实时的监测,但传统的监测方法费用高,反应慢,很难达到实时要求。提出一种用差分吸收光谱法对CS2进行测量的方法,详细介绍了数据的处理方法,包括测量波段的选择,数据处理流程和谱线的非线性处理。通过对灯谱结构的分析,提出了利用灯谱在测量波段的固有结构,实现对标准吸收截面的非线性处理方法,有效克服灯谱固有结构影响的同时,提高了测量精度。利用该方法对三种不同浓度的样品池进行测量,获得了非常高的相关性。对南京市某区的CS2进行了实时、连续地监测,取得了良好的效果。

CS2, a kind of poisonous gas, with bad smell, is very harmful to people. In China, precise and real-time CS2 monitoring is required in many big cities. With traditional measurement method, it is expensive and time-consuming, moreover it is very difficult to achieve real-time monitoring. A new CS2 measurement method was developed, based on differential optical absorption spectroscopy (DOAS), and the data processing method was discussed in detail. The selection of measurement waveband, steps of data processing and the spectrum dealing with nonlinear method were involved. Also the nonlinear dealing method of standard cross section was realized based on the analysis of lamp spectrum structure in the measuring waveband. With this method, not only the influence of lamp spectrum structure in the CS2 measurement band was effectively avoided, but also high measurement precision was gotten. Three different concentration cells were measured with this method, and high linear relativity was achieved. In the process of real-time and continuous monitoring in some place of Nanjing, a good result was gotten.