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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