| 用共振激光雷达探测热层氦浓度的数值模拟 |
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| 引用本文： | 张庆国,贺健.用共振激光雷达探测热层氦浓度的数值模拟[J].激光技术,2008,32(2):171-173. |
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| 作者姓名： | 张庆国 贺健 |
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| 作者单位： | 1.河南科技大学 理学院 洛阳 471003 |
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| 摘 要： | 为了分析激光雷达探测热层氦浓度的回归信号和信噪比,采用理论分析和计算机模拟的方法,得到了峰值有效后向散射截面的数量级约为10-17M2的结果;在忽略背景噪声和考虑背景噪声的情况下,数值模拟研究了其回归信号的大小。结果表明,目前探测系统的信噪比是比较小的,要提高系统的信噪比,就要降低分辨率范围Δz和延长积分时间τ。这一结果对激光雷达探测热层氦浓度有帮助。
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| 关 键 词： | 大气与海洋光学 共振激光雷达 数值模拟 后向散射截面 佛克脱线型 |
| 文章编号： | 1001-3806(2008)02-0171-03 |
| 收稿时间： | 2007/1/22 |
| 修稿时间： | 2007年1月22日 |
Numerical simulation for the detection of He density in thermosphere by resonant lidar |
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| ZHANG Qing-guo,HE Jian.Numerical simulation for the detection of He density in thermosphere by resonant lidar[J].Laser Technology,2008,32(2):171-173. |
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| Authors: | ZHANG Qing-guo HE Jian |
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| Affiliation: | ZHANG Qing-guo,HE Jian(School of Science,Henan University of Science , Technology,Luoyang 471003,China) |
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| Abstract: | In order to analyze the back signals and the signal-noise-ratio for the detection of He density in thermosphere by means of resonant lidar,the effective backscattering cross-section of about 10-17m2 was obtained after computer simulation. The size of the back signal was analyzed through numerical simulation with neglecting and considering the background signal respectively. Results showed that the signal-noise-ratio for current system was low,and that the range of the resolving power △Z should be decreased and the integral time τshould be extended in order to improve the signal-noise-ratio. There results are helpful for the detection of He density in thermosphere by means of resonant lidar. |
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| Keywords: | atmospheric and ocean optics resonant lidar numerical simulation backscattering cross-section Voigt profile |
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