All-fiber Coherent Doppler LIDAR for Wind Sensing

摘要

Coherent Doppler LIDAR is being utilized to develop a mobile wind speed measuring station. We are building an all fiber based eye safe laser system to measure wind speed in urban areas. A 1.5μ.m polarization maintained fiber optics master oscillator power amplifier system is used which leverages components from the telecommunication industry, We chose a heterodyne balanced detection to suppress the RIN noise. We have calculated the optimum local oscillator power for maximum optical detector's efficiency. A/D conversion will be performed at 400 MHZ by using a data acquisition card with FPGA on board, which can be programmed to perform autocorrelation and/or FFT onboard for faster performance. This system can be used along with other units on top of high buildings in New York City as a way of detecting wind speed profile for Homeland security.