Detectable Absorption Range Measurement of SOF2 and SO2F2 Using a System Based on Tunable Diode Laser Absorption Spectroscopy

Detecting the SF
6
decomposition components SO
2
and SOF
2
can help determine the status of SF
6
electrical equipment. In this paper, a mid-infrared TDLAS detection platform for the detection of SO
2
F
2
and SOF
2
is built. The absorption characteristics of SO
2
F
2
and SOF
2
were studied, and appropriate absorption bands were selected based on this, and relevant experiments were carried out to study the infrared absorption of gases with different concentrations. SO
2
F
2
has a better absorption waveform at 4700~5120 μs, and the linear relationship between the peak average value of the second harmonic at different concentrations is better. SOF
2
has a better absorption waveform at 5500~7500 μs, and the linear relationship between the peak average value of the second harmonic at different concentrations is better. It provides technical reference for the development of high-sensitivity detection devices for SO
2
F
2
and SOF
2
, and provides new ideas for fault diagnosis of SF
6
gas insulated equipment.