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| | | #REDIRECT: [[Sonic anemometer]] |
| #REDIRECT [[sonic anemometer]] | |
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| == sonic anemometer ==
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| <div class="definition"><div class="short_definition">An [[anemometer]] that measures [[linear]] components of the [[wind vector]] by determining the effect of the [[wind]] on transit times of acoustic pulses transmitted in opposite directions across known paths.</div><br/> <div class="paragraph">It operates on the principle that the propagation [[velocity]] of a [[sound wave]] in a moving medium is equal to the [[velocity of sound]] with respect to the medium plus the velocity of the medium. The wind velocity [[vector]] is determined by measuring the [[wind speed]] along three independent linear paths, for example, three [[orthogonal]] paths. The sonic anemometer is an [[absolute instrument]] and has the advantages of a very short [[time constant]] and an absence of moving mechanical parts.</div><br/> </div>
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