direction, this will result in an acceleration of the speed of propagation or vice-versa. If the airflow is not in the same direction as the propagation of the wave, the latter will thereby be distorted as a function of the sine of the angle formed between the two directions. Sonic anemometers are composed of four sets of wave generators and receivers installed on opposite sides of ab bH-S and E-W axis. Such a setup allows for measurements of average wind speed and direction, within the plane of the detectors. By adding more sets of wave generators and receivers on the vertical axis, this method can be used to build tridimensional measuring devices. The important instrumentation (wave generators, receivers, signal analysers, computers) and the complete installation of this type of anemometer makes it not only very expensive
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