报告详情
Cavity-enhanced Raman spectroscopy for simultaneous detection of multiple gases using Pound-Drever-Hall technology
编号：410
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更新：2022-08-29 16:04:30 浏览：131次
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摘要
Purpose/Aim
The accurate detection of SF6 decomposition characteristic gases is the key to realizing the evaluation of the operation status of gas insulation equipment, and this detection is an important technical support to ensure its safe and reliable operation.
Experimental/Modeling methods
The gas detection platform of Pound-Drever-Hall (PDH) frequency-locked linear cavity-enhanced Raman spectroscopy is built. The laser frequency is locked on the resonant frequency of the high-finesse Fabry–Pérot cavity by using PDH technology so that the laser intensity in the resonant cavity is greatly improved. Combined with some components such as dichroic mirror and spectrometer, the Raman signal of N2 in the air is detected.
Results/discussion
The finesse of the cavity is about 391, so the intracavity power gain is about 140. Knowing the cavity reflectivity, the circulating intracavity power is near 5W when the input power is 35 mW; 60 s is chosen as the integration time of the spectrometer, and the signal-to-noise ratio (SNR) of N2 Raman signal is approximately 4800 in this condition, more details are as shown in the appendix. It is proved that there is a certain linear relationship between gas Raman signal intensity and intracavity laser power through experiments.
Conclusions
This experiment lays a foundation for on-line monitoring of SF6 decomposition gas in running gas insulation equipment and accumulates experience for building a high finesse cavity-enhanced platform by using PDH frequency locking technology in the future. It can be used to detect SF6 and its decomposition gas, and improve the detection sensitivity of related gases.
Appendix (Figure, table, image…)
The accurate detection of SF6 decomposition characteristic gases is the key to realizing the evaluation of the operation status of gas insulation equipment, and this detection is an important technical support to ensure its safe and reliable operation.
Experimental/Modeling methods
The gas detection platform of Pound-Drever-Hall (PDH) frequency-locked linear cavity-enhanced Raman spectroscopy is built. The laser frequency is locked on the resonant frequency of the high-finesse Fabry–Pérot cavity by using PDH technology so that the laser intensity in the resonant cavity is greatly improved. Combined with some components such as dichroic mirror and spectrometer, the Raman signal of N2 in the air is detected.
Results/discussion
The finesse of the cavity is about 391, so the intracavity power gain is about 140. Knowing the cavity reflectivity, the circulating intracavity power is near 5W when the input power is 35 mW; 60 s is chosen as the integration time of the spectrometer, and the signal-to-noise ratio (SNR) of N2 Raman signal is approximately 4800 in this condition, more details are as shown in the appendix. It is proved that there is a certain linear relationship between gas Raman signal intensity and intracavity laser power through experiments.
Conclusions
This experiment lays a foundation for on-line monitoring of SF6 decomposition gas in running gas insulation equipment and accumulates experience for building a high finesse cavity-enhanced platform by using PDH frequency locking technology in the future. It can be used to detect SF6 and its decomposition gas, and improve the detection sensitivity of related gases.
Appendix (Figure, table, image…)
Table 1 N2 Raman signal and SNR in the air
| Integration time/s | Power in the cavity/W | Signal peaks | Noise | SNR | average SNR |
| 60 | 5 | 273079 | 58.24 | 4692.09 | 4841.69 |
| 60 | 5 | 273920 | 54.24 | 5050.14 | |
| 60 | 5 | 290748 | 60.79 | 4782.83 |
关键词
Cavity-enhanced Raman spectroscopy, Pound-Drever-Hall
报告人
Hongcheng Sun
Chongqing University稿件作者
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重要日期
-
会议日期
09月25日
2022
至09月29日
2022
-
08月15日 2022
提前注册日期
-
09月10日 2022
报告提交截止日期
-
11月10日 2022
注册截止日期
-
11月30日 2022
初稿截稿日期
-
11月30日 2022
终稿截稿日期
主办单位
IEEE DEIS
承办单位
Chongqing University
联系方式
- Zhengyong Huang
- 61******@qq.com
历届会议
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2020年09月06日 中国 Beijing
2020 IEEE International Conference on High Voltage Engineering and Application -
2018年09月10日 希腊
2018 IEEE International Conference on High Voltage Engineering and Application -
2016年09月19日 中国 Chengdu, China
2016 IEEE International Conference on High Voltage Engineering and Application
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