基于斐索干涉仪的直接探测多普勒测风激光雷达

提出结合多光束斐索(Fizeau)干涉仪和CCD探测器的条纹图像技术,测量地球边界层下的三维风场的直接探测多普勒激光雷达技术.在分析Fizeau干涉仪的物理特性和光谱特性以及影响测量多普勒频移的因数和改进方法的基础上,提出一套切合实际的直接探测多普勒激光雷达系统参数.并利用该参数进行性能评估分析,模拟不同干涉仪参数对风速精度的影响,得出一个优化的干涉仪物理参数.模拟结果显示,系统可以获得小于1 m s-1的水平风速精度.这些分析,为建立实际的激光雷达系统提供设计依据.

Wind Direct-Detection Doppler Lidar Based on a Multi-Beam Fizeau Interferometer

A wind direct-detection Doppler lidar system for planetary boundary layer wind measurement utilizing the fringe image technique combined of a multi-beam Fizeau interferometer and a CCD detector is proposed. The physical properties of the multi-beam Fizeau interferometer are discussed. The factors affecting the measurement of Doppler frequency shift and the correction methods are analyzed and presented. The numerical simulation of system performance using the proposed, practical specification parameters is implemented. The error of the horizontal wind speed is compared using the different parameters of Fizeau interferometer. The error of the horizontal wind speed can be less than 1 m s -1 using the optimized parameter of Fizeau interferometer. This analysis is significant to design and set up a practical direct-detection Doppler wind lidar system.