Optics and Precision Engineering, Volume. 32, Issue 14, 2189(2024)
Design of automatic image measuring system Research on dynamic and high-sensitive detection of SF6 discharge decomposition products by fluorescence-suppressed fiber-enhanced Raman spectroscopy
Figures & Tables(13)
Fig. 1. Schematic diagram of the fluorescence-suppressed FERS detection system of SF6 discharge decomposition products
Fig. 3. Raman spectra of air acquired by FERS gas detection system under different filtering methods
Fig. 6. Concentration calibration of 7 kinds of SF6 discharge decomposition products
Fig. 7. Raman spectra of SF6 discharge decomposition products measured continuously in 168 h
Fig. 8. Raman spectrum of nearby region of HF characteristic Raman peak after 168 h of experiment
Fig. 9. Concentration changes of SF6 discharge decomposition products in 168 h
Table 1. SNR under different filtering methods
View tableView in ArticleTable 1. SNR under different filtering methods
滤波方法 拉曼谱峰强度/
×106 a.u.
基线噪声/
a.u.
信噪比 未滤波 N2： 5.76 260.17 22 139.37 O2： 1.61 6 188.26 CCD数字滤波 N2： 5.32 194.43 27 362.03 O2： 1.56 8 023.45 SFF N2： 4.86 62.01 78 374.46 O2： 1.26 20 319.30
Table 2. Calculation of the lower limit of detection of 7 kinds of SF6 discharge decomposition products
View tableView in ArticleTable 2. Calculation of the lower limit of detection of 7 kinds of SF6 discharge decomposition products
分解产物 特征谱峰/cm-1 浓度/ppm 特征峰谱强度/a.u. 基线范围/cm-1 基线噪声/a.u. 检测下限/ppm SOF2 811 160 28 932.44 750~800 117.29 1.95 SO2F2 851 400 87 079.28 920~970 129.24 1.78 COS 862 400 187 659.03 920~970 129.24 0.83 CF4 912 400 64 322.98 920~970 129.24 2.41 SO2 1 156 400 172 788.11 1 170~1 220 133.83 0.93 CO2 1 396 400 61 000.45 1 430~1 480 127.46 2.51 CO 2 150 400 24 391.52 2 160~2 210 136.08 6.69
Table 3. Existing FERS gas detection performance
View tableView in ArticleTable 3. Existing FERS gas detection performance
文献 激光功率/
W
积分时间/
s
气体压强/
bar
光纤长度/m 检测下限/
ppm
理想归一化检测下限/
（ppm×W×bar×s-1/2）
［ 10 ］1.3 60 3.5 0.33 CO2： 25 148.51 ［ 12 ］1.3 200 5 2 CO2： 5
CO： 25
77.47
387.34
［ 13 ］1.3 120 5 0.45
（一端设有反射镜）
SOF2： 4.32
SO2F2：3.04
COS：1.44
CF4：3.70
SO2：1.08
CO2：1.82
CO：7.40
51.85
36.48
17.28
44.40
12.96
21.84
88.8
［ 16 ］0.2 60 1 2 CO： 16.7 4.36
Table 4. Measured concentrations of SF6 discharge decomposition products by FERS and GC
View tableView in ArticleTable 4. Measured concentrations of SF6 discharge decomposition products by FERS and GC
分解
产物
FERS测得浓度/ppm GC测得浓度/ppm FERS相对GC的偏差/% SOF2 197.42 194.45 +1.53 SO2F2 117.66 123.07 -4.40 SO2 25.39 26.25 -3.28 CO2 4.65 4.84 -3.93
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Tongqin RAN, Fu WAN, Quan ZHOU, Weiping KONG, Qiang LIU, Yingkai LONG, Weigen CHEN. Design of automatic image measuring system Research on dynamic and high-sensitive detection of SF6 discharge decomposition products by fluorescence-suppressed fiber-enhanced Raman spectroscopy[J]. Optics and Precision Engineering, 2024, 32(14): 2189
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Received: Apr. 15, 2024
Accepted: --
Published Online: Sep. 27, 2024
The Author Email: WAN Fu (wanfuhappy@163.com)
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