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A SONIC ANEMOMETER is 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; 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; an absolute instrument with a very
short time constant and an absence of moving mechanical parts.