基于激光光声光谱超高灵敏度检测SF_6分解组分H_2S
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摘要
H_2S是SF_6气体绝缘设备中放电故障诊断的特征组分之一;针对H_2S在红外波段吸收系数小,传统光学检测方法对H_2S检测灵敏度较低的问题,结合大功率光纤激光放大技术、共振式激光光声光谱技术、波长调制光谱技术和二次谐波检测技术,提出了一种基于光纤放大激光光声光谱的SF_6分解组分H_2S气体的超高灵敏度检测方法;采用近红外可调谐窄线宽分布反馈激光二极管级联高饱和输出功率掺饵光纤放大器作为光声激发光源,搭建具有超高灵敏度的激光光声光谱微量H_2S气体检测系统。结果表明:当测量时间为100s时,该系统对SF_6背景中H_2S气体的检测极限达到1.5×10~(-8)。
H_2S is one of characteristic components for discharge faults diagnosis in the SF_6 gas insulated device.Due to the small absorption coefficient of H_2S gas in the near-infrared band,the detection sensitivity is difficult to improve with traditional optical detection methods.To solve this problem,we propose an enhanced laser photoacoustic detection method,which combines the technologies of high-power fiber laser amplifying,resonant laser photoacoustic spectroscopy,wavelength modulation spectroscopy,and second-harmonic detection,for high sensitive detection of H_2S decomposed by SF_6.By cascading a near-infrared tunable narrow linewidth distributed feedback laser diode with a high saturation output power erbium doped fiber amplifier as the photoacoustic excitation light source,we develop a high-sensitivity laser photoacoustic spectroscopic system for trace H_2S gas detection.The results show that the detection limit in the background of SF_6 is achieved to be 1.5×10~(-8) with the measurement time of 100 s.
H_2S is one of characteristic components for discharge faults diagnosis in the SF_6 gas insulated device.Due to the small absorption coefficient of H_2S gas in the near-infrared band,the detection sensitivity is difficult to improve with traditional optical detection methods.To solve this problem,we propose an enhanced laser photoacoustic detection method,which combines the technologies of high-power fiber laser amplifying,resonant laser photoacoustic spectroscopy,wavelength modulation spectroscopy,and second-harmonic detection,for high sensitive detection of H_2S decomposed by SF_6.By cascading a near-infrared tunable narrow linewidth distributed feedback laser diode with a high saturation output power erbium doped fiber amplifier as the photoacoustic excitation light source,we develop a high-sensitivity laser photoacoustic spectroscopic system for trace H_2S gas detection.The results show that the detection limit in the background of SF_6 is achieved to be 1.5×10~(-8) with the measurement time of 100 s.
引文
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[2]Tang J,Rao X J,Zeng F P,et al.Influence mechanisms of trace H2O on the generating process of SF6spark discharge decomposition components[J].Plasma Chemistry and Plasma Processing,2017,37(1):325-340.
[3]Tang N,Qiao S Y,Li L,et al.Validity of HF and H2S as target gases of insulation monitoring in gas insulated switchgear[J].Transactions of China Electrotechnical Society,2017,32(19):202-211.唐念,乔胜亚,李丽,等.HF和H2S作为气体绝缘组合电器绝缘缺陷诊断特征气体的有效性[J].电工技术学报,2017,32(19):202-211.
[4]Zhou D P,Liu C Y,Zeng J,et al.The analysis of SF6 gas chromatography equipment on the spot application and studies[J].Journal of Electric Power,2009,24(5):412-415.周东平,刘春意,曾军,等.SF6设备气相色谱分析在现场的应用研究[J].电力学报,2009,24(5):412-415.
[5]Yu Z X,Xu J J.Feasibility study on application of TDLAS technology to detection of H2S in SF6discharge decomposition products[J].High Voltage Apparatus,2014,50(1):42-46.余志祥,续晋江.TDLAS技术用于SF6放电分解物H2S检测的可行性研究[J].高压电器,2014,50(1):42-46.
[6]Yin X K,Dong L,Wu H P,et al.Highly sensitive SO2 photoacoustic sensor for SF6 decomposition detection using a compact mW-level diode-pumped solid-state laser emitting at 303 nm[J].Optics Express,2017,25(26):32581-32590.
[7]Cai W,Tang J,Cheng L,et al.Detection of SF6decomposition components under partial discharge by photoacoustic spectrometry and its temperature characteristic[J].IEEE Transactions on Instrumentation and Measurement,2016,65(6):1343-1351.
[8]Chen Y,Gao G Z,Cai T D.Detection technique of ethylene based on photoacoustic spectroscopy[J].Chinese Journal of Lasers,2017,44(5):0511001.陈颖,高光珍,蔡廷栋.基于光声光谱的乙烯探测技术[J].中国激光,2017,44(5):0511001.
[9]Chen K,Yuan S,Gong Z F,et al.Ultra-high sensitive photoacoustic spectrometer for trace gas detection based on fiber-optic acoustic sensors[J].Acta Optica Sinica,2018,38(3):0328015.陈珂,袁帅,宫振峰,等.基于光纤声波传感的超高灵敏度光声光谱微量气体检测[J].光学学报,2018,38(3):0328015.
[10]Liu S Z,Zhang W,Yu Q X.Photoacoustic spectrometer based on the combination of tunable erbium doped fiber laser and erbium doped fiber amplifier[J].Chinese Journal of Lasers,2009,36(4):964-967.刘善峥,张望,于清旭.基于可调谐掺铒光纤激光器和掺铒光纤放大器的光声光谱气体分析仪[J].中国激光,2009,36(4):964-967.
[11]Wang J,Zhang W,Li L,et al.Breath ammonia detection based on tunable fiber laser photoacoustic spectroscopy[J].Applied Physics B,2011,103(2):263-269.
[12]Mao X F,Zhou X L,Gong Z F,et al.An all-optical photoacoustic spectrometer for multi-gas analysis[J].Sensors and Actuators B,2016,232:251-256.
[13]Elia A,LugaràP M,di Franco C,et al.Photoacoustic techniques for trace gas sensing based on semiconductor laser sources[J].Sensors,2009,9(12):9616-9628.
[14]Mürtz M,Hering P.Online monitoring of exhaled breath using mid-infrared laser spectroscopy[M]∥Ebrahim-Zadeh M,Sorokina I T.Mid-Infrared Coherent Sources and Applications.[S.l.]:Springer,2008:535-555.
[15]Wu H P,Dong L,Zheng H D,et al.Enhanced nearinfrared QEPAS sensor for sub-ppm level H2Sdetection by means of a fiber amplified 1582nm DFBlaser[J].Sensors and Actuators B,2015,221:666-672.
[16]Wu H P,Dong L,Liu X L,et al.Fiber-amplifierenhanced QEPAS sensor for simultaneous trace gas detection of NH3 and H2S[J].Sensors,2015,15(10):26743-26755.
[17]Zhang X X,Cheng Z,Li X.Cantilever enhanced photoacoustic spectrometry:quantitative analysis of the trace H2S produced by SF6 decomposition[J].Infrared Physics&Technology,2016,78:31-39.
[18]Dong L,Ma W G,Zhang L,et al.Mid-IR ultrasensitive CO detection based on pulsed quartz enhanced photoacoustic spectroscopy[J].Acta Optica Sinica,2014,34(1):0130002.董磊,马维光,张雷,等.基于脉冲石英增强光声光谱的中红外超高灵敏CO探测[J].光学学报,2014,34(1):0130002.
[19]Dumitras D C,Dutu D C,Matei C,et al.Laser photoacoustic spectroscopy:principles,instrumentation,and characterization[J].Journal of Optoelectronics and Advanced Materials,2007,9(12):3655-37701.
[20]Chen K,Liu X C,Luo X W,et al.32-channel fiber array input femtosecond laser optical spectrum analyzer with high sensitivity[J].Journal of Optoelectronics·Laser,2015,26(1):116-121.陈珂,刘学聪,罗先卫,等.32通道光纤阵列式高灵敏飞秒激光光谱分析仪[J].光电子·激光,2015,26(1):116-121.
[21]Chen K,Zhou X L,Peng W,et al.OFDR based distributed temperature sensor using the threechannel simultaneous radio-frequency lock-in technique[J].Photonic Sensors,2015,5(3):217-223.