环保绝缘介质C_(6)F_(12)O混合气体FTIR检测技术研究

Research on Infrared Spectrum Characteristics and Detection Technology of Environmentalfriendly Insulating Medium C_(6)F_(12)O

环保绝缘介质C_(6)F_(12)O混合气体具有应用于中低压设备的潜力,因此C_(6)F_(12)O混合气体检测技术的研究具有非常重要的现实意义。文中基于红外吸收光谱提出了C_(6)F_(12)O混合气体定性定量检测技术。基于密度泛函理论,对C_(6)F_(12)O分子进行结构优化,仿真计算其振动频谱,与实验检测红外光谱进行对比。对体积分数标定模型的波段和特征量的选取进行了详细的研究,提出C_(6)F_(12)O混合气体相关绝缘设备的混合比和微量体积分数检测方案。结果表明,红外光谱的仿真结果与实验结果具有较好的一致性;不同体积分数的吸收峰有很好的线性关系,利用峰值作为特征值比峰面积建立的体积分数标定模型准确性和稳定性强。混合比检测时,以3 500~3 567 cm^(-1)波段的峰值作特征量建立模型的拟合度为0.999 57,检测误差在2%以内;微量检测时,以1 750~1 820 cm^(-1)波段的峰值作特征量建立模型的拟合度高达0.999 97,检测误差小于3.8%,建立的体积分数标定模型的稳定性、准确性较好。文中研究结果提供实验和仿真的C_(6)F_(12)O红外光谱信息,为C_(6)F_(12)O型气体绝缘设备提供FTIR检测技术,为C_(6)F_(12)O混合气体绝缘设备的混合比和微量体积分数检测提供了重要的理论支撑。

The environmental-friendly insulating medium C_(6)F_(12)O mixed gas has the potential to be applied to medium and low pressure equipment,so the research on the detection technology of C_(6)F_(12)O mixed gas has very important practical significance.The qualitative and quantitative detection technology of C_(6)F_(12)O mixed gas is proposed based on infrared absorption spectroscopy.Based on density functional theory,the structure of C_(6)F_(12)O molecules is optimized,the vibration spectrum is calculated,and the infrared spectrum is compared with the experimental detection.The selection of band and characteristic quantity of concentration calibration model is studied in detail,and the mixture ratio and trace detection scheme of C_(6)F_(12)O mixed gas related insulation equipment are proposed.The results show that the simulation results of infrared spectrum are basically consistent with the experimental results.The accuracy and stability of the concentration calibration model by using the peak value as the eigenvalue are better than those of the peak area.When the mixture ratio was detected,the fitting degree of the model was 0.999 57 with the peak in the 3 500-3 567 cm^(-1)band as the characteristic quantity,and the detection error was within 2%.When the trace detection was performed,the fitting degree of the model based on the peak value of 1 750-1 820 cm^(-1)band as the characteristic quantity was as high as 0.999 97,and the detection error was less than 3.8%.The stability and accuracy of the concentration calibration model are good.The research results of this paper provide experimental and simulated C_(6)F_(12)O infrared spectroscopy information,provide FTIR detection technology for C_(6)F_(12)O gas insulation equipment,and provide important theoretical support for the mixture ratio and trace detection of C_(6)F_(12)O mixed gas insulation equipment.