Research on infrared spectrum characteristics and detection technology of environmental-friendly insulating medium C5F10O

C5F10O has excellent environmental performance and insulation characteristics, which has the potential to replace SF6 when mixed with buffer gas. Therefore, the research of C5F10O mixed gas detection technology has great practical significance. Based on infrared spectrum, the mixture ratio detection and trace detection technology of C5F10O mixed gas is proposed in this paper. According to the density functional theory, the structure of C5F10O molecule was optimized. The infrared spectrum of C5F10O molecule was simulated and compared with the experimental results. The infrared spectrum distribution of C5F10O is analyzed, and its overlap with CO2 and other gases is discussed. Multiple groups of absorption peaks were used as eigenvalues to establish stepwise multiple linear regression (SMLR) quantitative model, which improved the detection accuracy. 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 detecting the mixture ratio, the concentration calibration model established by SMLR fitting has better effect, higher accuracy and better stability, and the concentration inversion error is less than 1.5 %. The overlap of C5F10O and its main decomposition components was analyzed, and the band 860~890 cm-1 is suitable for trace detection. The research results provide experimental and simulated infrared spectrum information of C5F10O, and provide the theory support for the mixture ratio detection and trace detection technology of C5F10O mixed gas insulation equipment.