Gill Instruments Ltd
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WindObserver II Pipe Mount
Page 40
Issue 04
Doc. No. 1390-PS-0009
August 2009
11.3 . Principle of operation
The WindObserver II (Pipe Mount) 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.
陕西威瑞仪器仪表有限公司 生产代理销售:实验检测设备气象科学仪器设备
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