Modeling of Direct Detection Doppler Wind Lidar. II. The Fringe Imaging Technique.
Modeling of Direct Detection Doppler Wind Lidar. II. The Fringe Imaging Technique.
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DOI：
10.1364/ao.37.006487
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发表时间：
1998-09
期刊：
影响因子：
1.9
通讯作者：
J. Mckay
中科院分区：
文献类型：
--
作者：
J. Mckay
针对基于条纹成像技术的多普勒测风激光雷达在散粒噪声限制下的测量精度问题，建立了一个简单的分析模型。该模型导致标准具的设计参数的仪器精度优化。最终的测量精度可能是完美无损接收器极限的两到四倍。双边缘多普勒分析仪的相应结果是2.5的比率，表明这两种方法在这方面差别不大。对于气溶胶后向散射仪器，条纹成像仪的风速动态范围远大于边缘检测器。的标准具孔径需要满足系统的集光率的要求推导和示出约为一半的两个标准具所需的双边缘技术。与更详细的建模条纹成像多普勒频移分析仪的比较表明，瑞利模型和公平的气溶胶版本的良好协议，确认这种简单的技术分析仪的设计和性能预测的有效性。
A simple analytic model is developed for the shot-noise-limited measurement precision of Doppler wind lidars based on the fringe imaging technique by use of either molecular or aerosol atmospheric backscatter. The model leads to etalon design parameters for an instrument optimized for precision. The ultimate measurement precision possible is two to four times the limit for a perfect, lossless receiver. The corresponding result for the double-edge Doppler analyzer was a ratio of 2.5, showing that the two methods are little different in this respect. For aerosol backscatter instruments, the wind speed dynamic range of the fringe imager is substantially greater than that for the edge detector. The etalon aperture needed to meet system etendue requirements is derived and shown to be approximately half that of each of the two etalons required by the double-edge technique. A comparison with more detailed modeling of fringe imaging Doppler-shift analyzers shows good agreement for the Rayleigh model and fair for the aerosol version, confirming the validity of this simpler technique for analyzer design and performance prediction.