Vaisala WINDCAP WS425 Guia do Utilizador descarregar pdf (Página 29)

Chapter 3 ______________________________________________________ Functional Description

VAISALA _______________________________________________________________________ 27

The microprocessor of the microcontroller calculates WS from the

measured transit times using the following formula:

)t/1(1/tL5.0V

rfW







where

= Wind velocity

L = The distance between two transducers

= The transit time in the forward direction

= The transit time in the reverse direction

Measuring the six transit times allows Vw to be computed for each of the

three ultrasonic paths. Using Vw values of two array paths is enough to

compute WS and WD.

Figure 7 below shows the different paths of WMT700 and the vectors

provided by the wind sensor:

1104-066

Figure 7 Measurement Paths of WMT700

where:

1-6 = Measurement paths 1 to 6 of WMT700.

= The distance between two transducers.

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Vaisala WINDCAP WS425 Guia do Utilizador Página 29