Pedersen, Anders Tegtmeier4; Foroughi Abari, Farzad4; Mann, Jakob1; Mikkelsen, Torben1
1 Department of Wind Energy, Technical University of Denmark2 Test and Measurements, Department of Wind Energy, Technical University of Denmark3 Meteorology, Department of Wind Energy, Technical University of Denmark4 Department of Photonics Engineering, Technical University of Denmark
A new direction sensing continuous-wave Doppler lidar based on an image-reject homodyne receiver has recently been demonstrated at DTU Wind Energy, Technical University of Denmark. In this contribution we analyse the signal-to-noise ratio resulting from two different data processing methods both leading to the direction sensing capability. It is found that using the auto spectrum of the complex signal to determine the wind speed leads to a signal-to-noise ratio equivalent to that of a standard self-heterodyne receiver. Using the imaginary part of the cross spectrum to estimate the Doppler shift has the benefit of a zero-mean background spectrum, but comes at the expense of a decrease in the signal-to noise ratio by a factor of √2.
Journal of Physics: Conference Series (online), 2014, Vol 524
Main Research Area:
5th International Conference on The Science of Making Torque from Wind 2014European Academy of Wind Energy : The Science of Making Torque from Wind