全光纤差分吸收激光雷达大气成分探测精度分析
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摘要
为了提高全光纤差分吸收激光雷达的探测精度,研究近距离探测条件下使用光环形器的差分吸收激光雷达,这对提高气体探测精度具有重要的意义。分析了差分吸收激光雷达的探测精度与激光回波能量测量的关系,发现近距离条件下的气体探测精度将会受到环形器"串音"的影响,分析了不同探测高度下串音对探测精度的影响程度。结合CO2浓度探测的实例并通过仿真计算,得到了信噪比与探测相对误差随探测高度的变化曲线。结果表明,环形器中存在的"串音"会干扰激光回波信号,对探测信噪比与精度产生严重影响。该研究对设计与完善全光纤差分吸收激光雷达系统具有重要的借鉴意义。
In order to improve the detection accuracy of all-fiber differential absorption lidar(DIAL),it is very important to develop configuration of all-fiber DIAL system with circulator at close range.Relationship between detection accuracy of DIAL and laser echo energy is analyzed.At close range,crosstalk of circulator affects the detection accuracy.The influence of crosstalk on detection accuracy is analyzed at different heights.Combined with the example of CO2concentration detection and simulation,signal to noise rate(SNR)and relative error with height are analyzed.The research shows that crosstalk can interfere with laser echo and seriously affect detection SNR and accuracy.The study has important significance on the design and improvement of all-fiber DIAL system.
In order to improve the detection accuracy of all-fiber differential absorption lidar(DIAL),it is very important to develop configuration of all-fiber DIAL system with circulator at close range.Relationship between detection accuracy of DIAL and laser echo energy is analyzed.At close range,crosstalk of circulator affects the detection accuracy.The influence of crosstalk on detection accuracy is analyzed at different heights.Combined with the example of CO2concentration detection and simulation,signal to noise rate(SNR)and relative error with height are analyzed.The research shows that crosstalk can interfere with laser echo and seriously affect detection SNR and accuracy.The study has important significance on the design and improvement of all-fiber DIAL system.
引文
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13 Tao Xiaohong,Hu Yihua,Cai Xiaochun.Accuracy analysis of differential absorption lidar for detecting atmospheric CO2[J].Journal of Atmospheric and Environmental Optics,2008,3(2):100 -103.陶小红,胡以华,蔡晓春.差分吸收激光雷达探测大气CO2精度分析[J].大气与环境学报,2008,3(2):100-103.
14 G Megie,R T Menzies.Complementarity of UV and IR differential absorption lidar for global measurements of atmospheric species[J].Appl Opt,1980,19(7):1173-1183.
15 Wu Dong,Zhang Xiaoxue,Yan Fengqi,et al..Sea surface wind speed detection by using the data of CALIPSO lidar[J].Acta Optica Sinica,2012,32(8):0828002.吴东,张小雪,阎逢旗,等.基于星载激光雷达数据的海面风速探测[J].光学学报,2012,32(8):0828002.
16 Fan Guangqiang,Liu Jianguo,Chen Zhenyi,et al..A differential absorption lidar system for tropospheric ozone monitoring[J].Chinese J Lasers,2012,39(11):1113001.范广强,刘建国,陈臻懿,等.一套测量对流层臭氧的差分吸收激光雷达系统[J].光学学报,2012,39(11):1113001.
2 Hong Guanglie,Zhang Yinchao,Hu Shunxing.Near infrared micro pulse lidar of profiling atmospheric CO2[J].J Infrared Millim Waves,2004,23(5):384-388.洪光烈,张寅超,胡顺星.探测低空大气CO2浓度分布的近红外微脉冲激光雷达[J].红外与毫米波学报,2004,23(5):384-388.
3 Wang Xitao,Liu Bingyi,Wu Songhua,et al..1.55μm all-fiber laser heterodyne detection and data analysis with high measurement accuracy of velocity[J].Laser&Optoelectronics Progress,2011,48(6):060301.王希涛,刘秉义,吴松华,等.高精度1.55μm全光纤激光相干测速实验及数据分析[J].激光与光电子学进展,2011,48(6):060301.
4 Fu Yang,Yan He,Jianhua Shang,et al..Development of an allfiber heterodyne lidar for range and velocity measurements[J].Chin Opt Lett,2010,8(7):713-716.
5 Yuan Liu,Jiqiao Liu,Weibiao Chen.Eye-safe,single-frequency pulsed all-fiber laser for Doppler wind lidar[J].Chin Opt Lett,2011,9(9):090604.
6 Ma Zongfeng,Zhang Chunxi,Ou Pan,et al..Application of fiber interferometer in coherent Doppler lidar[J].Chin Opt Lett,2008,6(4):261-263.
7 Ceng Yong,Zhou Dingfu,Yang Zehou,et al..Signal processing for CO2 differential absorption lidar[J].Infrared and Laser Engineering,2006,35(24):197-201.陈涌,周鼎富,杨泽后,等.CO2差分吸收激光雷达信号处理[J].红外与激光工程,2006,35(24):197-201.
8 Ma Xin,Lin Hong,Ma Yingying,et al..Atmospheric pressure broadening correction algorithm of differential absorption atmospheric CO2lidar[J].Acta Optica Sinica,2012,32(11):1101003.马昕,林宏,马盈盈,等.差分吸收大气CO2激光雷达的大气压力增宽修正算法[J].光学学报,2012,32(11):1101003.
9 Qu Zengfeng,Jin Chenfei,Zhao Yuan,et al..Theoretical analysis of structure and operation range calculation of a novel fiber lidar[J].Infrared and Laser Engineering,2008,38(2):300 -303.屈增风,靳辰飞,赵远,等.新型光纤激光雷达的结构理论分析与作用距离计算[J].红外与激光工程,2008,38(2):300-303.
10 Sun Jingqun.Laser Atmosphere Detect[M].Beijing:Science Press,1986.103.孙景群.激光大气探测[M].北京:科学出版社,1986.103.
11 James D Spinhirne.Micro pulse lidar[J].IEEE Transaction on Geoscience and Remote Sensing,1993,31(1):48-55.
12 ERemsberg,L Gordley.Analysis of differential absorption lidar from the space shuttle[J].Appl Opt,1978,17(4):624-630.
13 Tao Xiaohong,Hu Yihua,Cai Xiaochun.Accuracy analysis of differential absorption lidar for detecting atmospheric CO2[J].Journal of Atmospheric and Environmental Optics,2008,3(2):100 -103.陶小红,胡以华,蔡晓春.差分吸收激光雷达探测大气CO2精度分析[J].大气与环境学报,2008,3(2):100-103.
14 G Megie,R T Menzies.Complementarity of UV and IR differential absorption lidar for global measurements of atmospheric species[J].Appl Opt,1980,19(7):1173-1183.
15 Wu Dong,Zhang Xiaoxue,Yan Fengqi,et al..Sea surface wind speed detection by using the data of CALIPSO lidar[J].Acta Optica Sinica,2012,32(8):0828002.吴东,张小雪,阎逢旗,等.基于星载激光雷达数据的海面风速探测[J].光学学报,2012,32(8):0828002.
16 Fan Guangqiang,Liu Jianguo,Chen Zhenyi,et al..A differential absorption lidar system for tropospheric ozone monitoring[J].Chinese J Lasers,2012,39(11):1113001.范广强,刘建国,陈臻懿,等.一套测量对流层臭氧的差分吸收激光雷达系统[J].光学学报,2012,39(11):1113001.