光子学报, 2010, 39 (6): 1064, 网络出版: 2010-08-31
1.55 μm相干激光测风雷达平衡式探测接收实验
Investigation of Balanced Detection and Receiver for 1.55 μm Coherent Wind Lidar
激光雷达 外差探测 平衡式接收 多普勒频移 光束分束比 Lidar Heterodyne detection Balanced detection Doppler shift Beam-splitter coefficient
摘要
研究了用于相干激光测风雷达信号接收的平衡式探测接收技术.推导出了平衡式相干探测过程的数学模型和信噪比表达式，并通过仿真软件对该模型进行了模拟仿真.在同等输入条件下，当平衡式相干探测系统的最佳分束比范围在［0.293，0.707］时，其信噪比比普通相干探测的信噪比高.此外，平衡式探测接收还具有判断风向的功能，最后通过实验验证了仿真结果.
Abstract
Balanced receiver technique for signal detection in coherent lidar is analyzed.Mathematical modeling and signal-to-noise ratio of the balanced detection process is deduced.A numerical simulated system is established.For the same input signal，when the beam-splitter coefficient of balanced coherent detection is between 0.293 and 0.707,the signal-to-noise ratio of balanced coherent detection is higher than that of single detector coherent detection.And also direction of the wind can be obtained using the balanced detection technique，and experiment results are consisted well with simulation results.
高龙, 王春晖, 李彦超, 丛海芳. 1.55 μm相干激光测风雷达平衡式探测接收实验[J]. 光子学报, 2010, 39(6): 1064. GAO Long, WANG Chun-hui, LI Yan-chao, CONG Hai-fang. Investigation of Balanced Detection and Receiver for 1.55 μm Coherent Wind Lidar[J]. ACTA PHOTONICA SINICA, 2010, 39(6): 1064.
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