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Quantitative detection of H2S and CS2 mixed gases based on UV absorption spectrometry

机译:基于紫外吸收光谱法定量检测H 2 S和CS 2 混合气体

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H2S and CS2 are the decomposition components of insulating gas SF6. The detection of these two gases is significant for the online monitoring and fault diagnosis of SF6 electrical equipment. In this study, an ultraviolet (UV) differential optical absorption spectrometry (UV-DOAS) platform is established for detecting the concentration of H2S and CS2 mixed gases. Based on the platform, we obtained the UV absorption spectra of the two gases. The linear relationship between each gas absorption spectra and the concentration was established by wavelet processing and frequency analysis. The interference between the two gases in the UV spectrum region was studied. H2S at different concentrations had little effect on the UV absorption spectra of CS2. The linearity (R2) of CS2 inversion formula was 0.9997. CS2 above 50?ppb produces a great interference on H2S concentration detection. CS2 concentration has a linear relationship with the H2S concentration inversion; hence, the H2S correction formula with CS2 concentration as the variable is proposed. With the correction formula, the linearity (R2) of H2S inversion formula reaches 0.9994 in mixed gas detection, which can meet the H2S and CS2 mixed gases quantitative detection.
机译:H 2 S和CS 2 是绝缘气体SF 6 < / sub> 。两种气体的检测对于SF 6 电气设备的在线监测和故障诊断具有重要意义。本研究建立了用于检测H 2 S和CS 2 混合气体。基于该平台,我们获得了两种气体的紫外吸收光谱。通过小波处理和频率分析建立了各气体吸收光谱与浓度之间的线性关系。研究了紫外光谱区域中两种气体之间的干扰。不同浓度的H 2 S对CS 2 的紫外吸收光谱影响很小。 CS 2 反演公式的线性度( R 2 )为0.9997。 CS 2 高于50?ppb会对H 2 S浓度检测产生很大的干扰。 CS 2 浓度与H 2 S浓度反演具有线性关系。因此,提出了以CS 2 浓度为变量的H 2 S校正公式。利用校正公式,H 2 S的线性度( R 2 )混合气体检测中的反演公式达到0.9994,可以满足H 2 S和CS 2 混合气体定量的要求检测。

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