在航空传感器系统,测速传感器皮托管的探测器入口容易被堵住,造成事故。 目前测风激光雷达是唯一可以替代皮托管的传感器,常见的脉冲测风激光雷达在近距离存在盲区而无法测量。 为了解决此问题,使用1.5 μm光纤激光器作为激光光源,其输出能量约为1 W,与保偏环形器、 耦合器等器件搭建了一套同轴收发的风速仪系统。使用距离望远镜5 m的转盘对风速仪进行了标定实验,实 验结果表明系统的速度分辨率和测量与转盘实际速度的线性拟合系数分别为0.021 m/s和0.99。使用此系统 成功实现了大气风速的测量(25 m处的大气)。

In the system of the aviation sensor, entrance of pitot tube used for speed measuerment is easily blocked and causes an accident. Currently the wind lidar is the unique solution to be a substitute for pitot tube. The common pulsed wind lidar cannot work in the near field due to blind spot at close range. In order to solve this problem, a monostatic coherent 1.55 μm continuous-wave (CW) laser Doppler wind velocimetry with an output power of 1 W was presented, in which a fiber-optics polarization-maintaining circulator, coupler and a balanced detector was used. A standarized experiment was carried out using a rotating platform, 5 m away from the telescope of the velocimetry. Results show that a velocity accuracy of 0.021 m/s and an excellent degree of speed correlation (R2=0.99) form a linear regression analysis of the system versus true rotating target. It was also showed that the speed of air away from telescope 25 m was implemented with the velocimetry.