Long range LDA wind velocity measurements using visible laser radiation

Experimental investigations were carried out to verify that long range laser Doppler anemometer wind velocity measurements are feasible with visible laser radiation. Backscattered photon resolved signals were detected up to 105 m, the maximum range attempted employing natural aerosols and using an estimated light power of 2.5 W in the measuring volume. Several examples of detected signals are shown. Predictions using information from the experiments and using Mie-scattering programs indicate that measurements to at least 500 m should be possible with existing laser power.