Measurement principle - WM80

WM80 User Guide

Document code
M212995EN
Revision
A
ft:locale
en-US
Product
WM80
Document type
User guide

WM80 wind measurement is based on the Vaisala WINDCAP sensor technology and uses a novel reflector design that focuses the ultrasonic signal to the transducers providing up to 10 times stronger signal and exceptionally reliable wind measurements.

The WINDCAP sensor technology is based on the time-of-flight measurement principle that uses 3 ultrasonic transducers each acting as a transmitter and a receiver at a time.

A continuous measurement sequence provides time-of-flight values (the time it takes the ultrasound to travel from each transducer to the other) on 6 paths. The wind speed and wind direction are calculated from the measured time-of-flight values as the wind flow affects each 6 path differently, depending on the wind speed and wind direction.

The wind direction is the direction from which wind is blowing. It is expressed in degrees where 0° represents north, 90° represents east, and so on, increasing clockwise and completing the circle at  359°.

WM80 has scalar output.

Time-of-flight measurement principle and reflector