Presentation Details
Cavity-enhanced Raman spectroscopy for simultaneous detection of multiple gases using Pound-Drever-Hall technology
ID：410
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Updated Time：2022-08-29 16:04:30 Hits：278
Poster Presentation
Start Time：Pending（Asia/Shanghai）
Duration：Pending
Session：No Session »
Abstract
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 |
Keywords
Cavity-enhanced Raman spectroscopy, Pound-Drever-Hall
Speaker
Hongcheng Sun
Chongqing UniversitySubmission Author
All Comments
Important Date
-
Conference Date
Sep 25
2022
toSep 29
2022
-
Aug 15 2022
Early Bird Registration
-
Sep 10 2022
Contribution Submission Deadline
-
Nov 10 2022
Registration deadline
-
Nov 30 2022
Draft paper submission deadline
-
Nov 30 2022
Final Paper Deadline
Sponsored By
IEEE DEIS
Organized By
Chongqing University
Contact Information
- Zhengyong Huang
- 61******@qq.com
Previous Conferences
-
2020-09-06 China Beijing
2020 IEEE International Conference on High Voltage Engineering and Application -
2018-09-10 Greece
2018 IEEE International Conference on High Voltage Engineering and Application -
2016-09-19 China Chengdu, China
2016 IEEE International Conference on High Voltage Engineering and Application
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