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Issue: 8 (Applies to firmware 2387 6.09 onwards)
Document number: 1390-PS-0039
Appendix O - Principle of operation
The WindObserver 65 measures the times taken for an ultrasonic pulse of sound to travel from the North transducer to
the South transducer, and compares it with the time for a pulse to travel from S to N transducer. Likewise times are
compared between West and East, and E and W transducer.
If, for example, a North wind is blowing, then the time taken for the pulse to travel from N to S will be faster than from S
to N, whereas the W to E, and E to W times will be the same. The wind speed and direction (and the speed of sound) can
then be calculated from the differences in the times of flight on each axis. This calculation is independent of factors such
as temperature.
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