双边缘瑞利测风技术中信号通道分光比对风速反演的影响

发布时间：2018-02-25 05:07

本文关键词： 激光遥感测风瑞利散射光纤分束器分束片　出处：《中国激光》2014年07期 　论文类型：期刊论文

【摘要】：理论分析表明,双边缘瑞利测风激光雷达技术中,信号通道分光精度影响风速测量精度。因此,在风速误差计算上,需考虑分光比误差,且尽量选择分光稳定性好的仪器。在激光雷达中,常常利用光纤分束器与分束片进行分光。分束片的分光受大气退偏振效应影响,分光不稳定;而光纤分束器分光比需测量,存在测量误差。分析可得,在纯分子散射环境下,由于退偏振效应引起分光片的相对变化为0.07%~0.63%;实验测得多模光纤分束器分光比均值为1.018,标准偏差为0.4%,分析比较后选用分光稳定较好的光纤分束器。最后,进行了瑞利多普勒激光雷达与探空气球的联合测风实验,实验结果表明两者风场分布吻合得较好。
[Abstract]:Theoretical analysis shows that, in the technique of double edge Rayleigh wind lidar, the accuracy of signal channel light separation affects the measurement accuracy of wind speed. Therefore, in the calculation of wind speed error, it is necessary to consider the error of light splitting ratio. In lidar, optical fiber splitter and beam splitter are often used to separate light. The splitting of beam splitter is affected by atmospheric depolarization effect, and the splitting ratio of optical fiber splitter needs to be measured. There are measurement errors. Analysis can be obtained in pure molecular scattering environment, The relative variation of the splitter due to depolarization effect is 0.07 and 0.63. The experimental results show that the average light splitting ratio of the multimode fiber splitter is 1.018 and the standard deviation is 0.4. After analysis and comparison, the optical splitter with better stability is selected. The wind field distribution of Rayleigh Doppler lidar and sounding balloon is in good agreement with the experimental results.
【作者单位】：中国科学技术大学地球与空间科学学院;
【基金】：国家自然科学基金(41174130,41227804,41174131,41274151) 自然科学青年基金(41304123) 中央高校基本科研业务费专项(WK2080000048)
【分类号】：TN958.98

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