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11-1
A3280 Rev 1.2
Weather Station Operation/Installation Manual
Operation of the
Weather Station
Wind Speed
The wind speed measurement portion of the Weather Station consists
of three ultrasonic transducers spaced equally around a horizontally-
aligned circle.
The wind speed is measured by measuring the time of ight of an
ultrasonic sound pulse, generated by one sensor and received by the
other two sensors. Each of the three sensors takes a turn at being the
transmitter, while the remaining two sensors receive the pulse.
Wind blowing in the direction of ight of a pulse increases the speed of
the pulse by the amount of the wind speed. Measuring the time of ight
in both directions between a given pair of transducers allows the speed
of sound to be cancelled out of the calculation, making the wind speed
computation independent of air temperature and relative humidity.
The ultrasonic transducers are robust, yet sensitive instruments. The
transducers themselves must be kept free of any coating, such as paint.
The Weather Station unit itself, especially the area
between the transducers, must be kept clean and free
of debris for maximum wind speed and direction
accuracy.
NOTICE