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直接探测多普勒测风激光雷达中,双边缘技术可分别测量回波信号中大气分子散射和气溶胶散射的成分,因而在保持高测速灵敏度的同时,可以减小瑞利背景噪声的影响。这决定了其在大气对流层风场观测的优势地位。直接探测双边缘技术中,使用双通道 Fabry-Perot 标准具作为鉴频器,将频率变换转换为信号强度变化。该技术的前提是出射激光频率始终处在双通道标准具透过率曲线的交点频率附近。提出的标准具腔长调制反馈电路方法有效解决了该问题。
In direct detection Doppler wind lidar, the dual-edge technique can measure the components of atmospheric molecular scattering and aerosol scattering in the echo signal respectively, so the influence of Rayleigh background noise can be reduced while keeping the high velocity sensitivity. This determines its dominant position in the atmospheric troposphere observations. In direct detection of both edge technologies, a dual-channel Fabry-Perot etalon is used as a frequency discriminator to convert the frequency conversion to a signal strength change. The premise of this technique is that the exit laser frequency is always near the intersection frequency of the two-channel etalon transmittance curve. The proposed method with cavity length modulation feedback circuit effectively solves this problem.