| SELECTION OF BRILLOUIN SHIFT DISCRIMINATOR FOR BRILLOUIN LIDAR |
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| 作者姓名： | 吴东 刘智深 |
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| 作者单位： | OceanRemoteSensingLaboratoryofMinistryofEducationofChina,OceanUniversityofQingdao,Qingdao266003,China |
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| 基金项目： | ThisprojectNo.498860 0 1supportedbyNSFC andalsobytheResearchFundfortheHigherEducationDoctoralProgram(No .970 42 3 0 3 ) |
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| 摘 要： | For the measurement of vertical profiles of sound speed in the sea using laser excited Brillouin scattering, a high-resolution measurement of Brillouin frequency shift is required. In this work, a molecular absorption cell was selected as the frequency shift discriminator and several kinds of absorption gases were tried. It was found that the strong line ( # 1095) of ^127 I2 at 18783. 3297 cm^-1 and two absorption lines of ^129 I2 located at the two sides of the # 1095 line of ^127 I2 could be used as frequency shift discriminator to detect the changes of the Brillouin frequency shift. This selection is the best one within the range from 532.0131 run to 532.5154 nm. But it is not perfect and there is a lot of work to do before its practical application.
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| 关 键 词： | 布里渊散射 激光雷达 测量 声速 频率 |
| 收稿时间： | 2 March 2001 |
Selection of brillouin shift discriminator for brillouin lidar |
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| Wu Dong,Liu Zhi-shen.SELECTION OF BRILLOUIN SHIFT DISCRIMINATOR FOR BRILLOUIN LIDAR[J].Chinese Journal of Oceanology and Limnology,2002,20(3):197-201. |
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| Authors: | Wu Dong Liu Zhi-shen |
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| Institution: | (1) Ocean Remote Sensing Laboratory of Ministry of Education of China, Ocean University of Qingdao, 266003 Qingdao, China |
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| Abstract: | For the measurement of vertical profiles of sound speed in the sea using laser excited Brillouin scattering, a high resolution measurement of Brillouin frequency shift is required. In this work, a molecular absorption cell was selected as the frequency shift discriminator and several kinds of absorption gases were tried. It was found that the strong line (#1095) of 127 I 2 at 18783.3297 cm -1 and two absorption lines of 129 I 2 located at the two sides of the #1095 line of 127 I 2 could be used as frequency shift discriminator to detect the changes of the Brillouin frequency shift. This selection is the best one within the range from 532.0131 nm to 532.5154 nm. But it is not perfect and there is a lot of work to do before its practical application. |
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| Keywords: | Brillouin scattering lidar molecular absorption cell |
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