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. 2021 Dec 7;21(24):8165.
doi: 10.3390/s21248165.

Application of Excimer Lamp in Quantitative Detection of SF6 Decomposition Component SO2

Tunan Chen  1   2 , Kang Li  1 , Fengxiang Ma  3 , Xinjie Qiu  3 , Zongjia Qiu  1 , Zhenghai Liao  1   2 , Guoqiang Zhang  1   2
Affiliations

Application of Excimer Lamp in Quantitative Detection of SF6 Decomposition Component SO2

Tunan Chen et al. Sensors (Basel). .

Abstract

Accurate quantitative detection for trace gas has long been the center of failure diagnosis for gas-insulated equipment. An absorption spectroscopy-based detection system was developed for trace SF6 decomposition SO2 detection in this paper. In order to reduce interference from other decomposition, ultraviolet spectrum of SO2 was selected for detection. Firstly, an excimer lamp was developed in this paper as the excitation of the absorption spectroscopy compared with regular light sources with electrodes, such as electrodeless lamps that are more suitable for long-term monitoring. Then, based on the developed excimer lamp, a detection system for trace SO2 was established. Next, a proper absorption peak was selected by calculating spectral derivative for further analysis. Experimental results indicated that good linearity existed between the absorbance and concentration of SO2 at the chosen absorption peak. Moreover, the detection limit of the proposed detection system could reach the level of 10-7. The results of this paper could serve as a guide for the application of excimer lamp in online monitoring for SF6-insulated equipment.

Keywords: SF6-insulated equipment; absorption spectroscopy; excimer lamp; online monitoring.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Absorption cross section of SO2 in UV range.
Figure 2
Figure 2
Emission intensity of excimer lamps.
Figure 3
Figure 3
Schematic diagram of the detection system.
Figure 4
Figure 4
Absorption spectra of transmission at different concentration of SO2.
Figure 5
Figure 5
Smoothed spectra at different concentration of SO2.
Figure 6
Figure 6
Derivative spectra of absorbance at different concentration of SO2.
Figure 7
Figure 7
Linear fitting between absorbance and concentration.
Figure 8
Figure 8
Output of the excimer lamp.
Figure 9
Figure 9
Fluctuation over time of the spectrometer.
See this image and copyright information in PMC

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