Development of All-fiber Coherent Doppler Lidar to Measure Atmosphere Wind Speed

An all-fiber pulsed coherent Doppler lidar (CDL) prototype is developed to measure wind profiles in the lower atmosphere layer. The all-fiber single frequency pulsed laser is operated with pulse energy of 50μJ, pulse width of 500ns and pulse repetition rate of 10kHz. The AOM heterodyne frequency is about 55MHz. The diameter of the telescope is 100mm. The heterodyne mixing signal is acquired with 500M/s AD card. Several experiments are implemented to validate the performance of the system. With 3000 pulses accumulated, the maximum horizontal measurement range of wind speed is about 4.2km in clear day, and the maximum vertical range is near 2km. The speed measurement accuracy of the lidar in hard target experiment is shown to be about 0.2m/s. An engineering prototype is being developed to measure wind speed in 5000m range, which will be used in the airport to measure atmosphere windshear.