Ultrasonic Anemometer 2D
Operating Instructions 4.3801.00.000
1. Range of Application
The Ultrasonic Anemometer 2D is designed to detect
the horizontal components of wind speed and wind
direction in two dimensions as well as the virtual
temperature. Due to its very short measurement
intervals, the instrument is ideal for the inertia-free
measurement of gusts and peak values.
In certain weather situations the accuracy of the air
temperature measurement (virtual-temperature)
surpasses that one of the classic method where the
temperature transmitter is used a weather and thermal
radiation shield.
The measured data are available as analogue signals
and as a data telegram via a serial interface. The
ultrasonic transducers as well as its carrying arms are
automatically heated so that the measuring results, in
case of critical ambient temperatures, are not affected
by icing rain or snow, and the risk of operation trouble,
caused by icing, is minimized.
2. Mode of Operation
The Ultrasonic Anemometer 2D consists of 4 ultrasonic transducers, in pairs of 2 which are opposite each
other at a distance of 200 mm.
The two measurement paths thus formed are vertical to each other.
The transformers act both as acoustic transmitters and acoustic receivers.
The respective measurement paths and their measurement direction are selected via the electronic control.
When a measurement starts, a sequence of 4 individual measurements in all 4 directions of the
measurement paths is carried out at maximum possible speed.
The measurement directions (acoustic propagation directions) rotate clockwise, first from south to north, then
from west to east, from north to south and finally from east to west.
The mean values are formed from the 4 individual measurements of the path directions and used for further
calculations.
A measurement sequence takes approx. 10 msec at +20°C.
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