| 探测大气中CO2的Raman激光雷达 |
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| 引用本文： | 洪光烈,张寅超,赵曰峰,邵石生,谭 锟,胡欢陵. 探测大气中CO2的Raman激光雷达[J]. 物理学报, 2006, 55(2): 983-987 |
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| 作者姓名： | 洪光烈 张寅超 赵曰峰 邵石生 谭 锟 胡欢陵 |
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| 作者单位： | (1)中国科学院安徽光学精密机械研究所大气光学室，合肥 230031; (2)中国科学院研究生院，北京 100039;中国科学院安徽光学精密机械研究所大气光学室，合肥 230031 |
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| 摘 要： | 基于大气激光后向散射光谱，研究和设计了探测大气CO2浓度的Raman激光雷达,其发射机采用Nd∶YAG激光的三倍频354.7nm作为工作波长,发射的单脉冲能量350mJ,重复频率20Hz；接收机采用了光电倍增管(量子效率25%)和光子计数器(计数速率200MHz),探测CO2的Raman散射371.66nm(频移1285cm-1)信号,(1小时累加)近地面2.5km以内信噪比不小于8.采用组合滤光片来抑制强的354.7nm Mie-Rayleigh后向散射和氧气375.4nm Raman后向散射对信号的严重干扰. 比较分别来自大气CO2和参考气体N2的Raman后向散射回波,可反演出大气中CO2的相对浓度.关键词：大气光学激光雷达Raman散射光谱参考气体Mie-Rayleigh散射
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| 关 键 词： | 大气光学 激光雷达 Raman散射光谱 参考气体 Mie-Rayleigh散射 |
| 文章编号： | 1000-3290/2006/55(02)/0983-05 |
| 收稿时间： | 2004-09-20 |
| 修稿时间： | 2004-09-202005-06-20 |
Raman lidar for profiling atmospheric CO2 |
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| Hong Guang-Lie,Zhang Yin-Chao,Zhao Yue-Feng,Shao Shi-Sheng,Tan Kun and Hu Huan-Ling. Raman lidar for profiling atmospheric CO2[J]. Acta Physica Sinica, 2006, 55(2): 983-987 |
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| Authors: | Hong Guang-Lie Zhang Yin-Chao Zhao Yue-Feng Shao Shi-Sheng Tan Kun Hu Huan-Ling |
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| Affiliation: | 1.Graduate School of The Chinese Academy of Sciences, Beijing 100039, China ;2. Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China |
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| Abstract: | Based on laser atmosphere backscattering spectrum, the design and experiment of a Raman lidar system for measurement of atmospheric CO2 are presented. 354.7nm third harmonic of Nd∶YAG laser is transmitted with 350mJ pulse energy and repetition rate of 20Hz. The receiver employs a photomultiplier tube with quantum efficiency of 25% and 200MHz photon counter, and it detects Raman backscattering 371.66nm(shift 1285cm-1) signal. At 1h integration, the signal to noise ratio below 2.5km is greater than 8. Combinatorial filter is used to reject interference presented by 354.7nm intense Mie-Rayleigh backscattering and 375.4nm Raman backscattering from O2. We compare the Raman return signal at 371.66nm from atmospheric CO2 with the reference Raman return signal at 386.7nm from atmospheric N2 to retrieve the atmospheric CO2 concentration. |
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| Keywords: | atmospheric optics lidar Raman scattering spectrum reference gas Mie-Rayleigh scattering |
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