Gill Instruments Windobserver 65 User Manual

Gill Instruments Ltd
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WindObserver 65 Page 64 Issue 4
Doc. No. 1390-PS-0039 June 2016
11.3. 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.

Gill Instruments Windobserver 65 Specifications

General

Brand	Gill Instruments
Model	Windobserver 65
Category	Measuring Instruments
Language	English