- heat transfer method
- sonic method
2.5.22 Measurement Instruments
2.5.221 Instruments using the dynamic methods
- The Wind Vane (Direction)
An assembly of a vane plate (which can have many shapes)
and a needle is mounted on a vertical axis, which allows it
to revolve freely. As a result of the mechanical action of
the wind on the vane, the needle will be turned in the
direction from which the wind blows. As the direction
indicated by the vane, oscillates around the equilibrium
point of the airflow (which can change direction rapidly
over time, big efforts have been undertaken to minimise
this drawback by different designs. The axis of the wind
vane can be connected to a mechanical or electrical
(contacts, potentiometer) device, which provide recording
facilities and/or remote reading of the wind direction.
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