基于紫外光谱的C_4F_7N/CO_2混合气体混合比检测

Mixing Ratio Detection for C_4F_7N/CO_2 Mixed Gas Based on Ultraviolet Spectroscopy

C_4F_7N/CO_2混合气体是一种新型环保绝缘介质,具有替代SF_6的潜力,得到了研究人员的广泛关注。C_4F_7N/CO_2混合气体的绝缘性能与其中C_4F_7N占比有着密切关系,因此快速准确地进行混合气体混合比检测具有重要的工程意义。目前尚未有关于混合气体混合比快速检测方法的相关报道。基于紫外光谱技术搭建了C_4F_7N气体分析平台,对C_4F_7N的紫外吸收光谱特性进行了实验分析,获取了C_4F_7N气体在185～210 nm的紫外光谱信息,利用此波段的紫外光谱信息确定了未知混合比气体的反演算法,最终实现了C_4F_7N/CO_2混合气体混合比的快速检测。研究发现C_4F_7N在185～210 nm存在明显的吸收峰;在C_4F_7N/CO_2混合气体常规应用混合比范围内(4%～10%),混合比反演曲线的拟合优度R^2高达0.999 9,混合比反演误差不超过0.88%。相关研究成果为C_4F_7N/CO_2混合气体绝缘设备混合比在线监测提供了优良的解决方案。

C4F7 N/CO2 mixed gas is a new type of environmentally friendly insulation medium with the potential to replace SF6 gas,which has received extensive attention from researchers.The insulation performance of C4F7 N/CO2 mixed gas is closely related to the percentage of C4F7 N.Therefore,it is of great significance to quickly and accurately detect the percentage of C4F7 N in the mixed gas.There is no relevant reports on the method for rapid quantitatively detecting the percentage of C4F7 N in mixed gas.Consequently,we built a C4F7 N gas analysis platform based on UV spectroscopy,and experimentally analyzed the UV absorption spectrum characteristics of C4F7 N.The UV spectral information of C4F7 N gas at 185~210 nm was acquired.The inversion algorithm of unknown concentration gas was determined by the spectral information,and the rapid detection of the percentage of C4F7 N in C4F7 N/CO2 mixed gas was finally realized.It is found that C4F7 N has a distinct absorption peak at 185~210 nm.In the conventional percentage range in C4F7 N/CO2 mixed gas(4%~10%),the R2 of the mixture ratio inversion curve is as high as 0.999 9,and the mixture ratio inversion error does not exceed 0.88%.The related research results provide an excellent solution for monitoring the mixture ratio of C4F7 N in C4F7 N/CO2 mixed gas insulated equipment.