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

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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

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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

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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.