The only approximation relies on accepting that the large-eddy motions do not change significantly while crossing the set of anemometers.
The time delay is due to small electronic differences between the two anemometers.
A three-component laser anemometer has been developed to measure this highly turbulent three-dimensional flow.
Signals from the hot-film anemometer and the pressure cell were displayed simultaneously on the oscilloscope.
The linear analysis was verified by analyzing a portion of data using the exact, non-linear response function of the anemometers.
This initial calibration confirmed an accurate correlation between fan rev/min and mean-wind speed; consequently this was used t o calibrate the anemometers.
With this arrangement the anemometers covered the full velocity defect in the vertical plane, and an equivalent length in the horizontal one.
The anemometers are calibrated by means of hot-wire measurements of phase in the periodic heat wake of a fine wire heated from the mains.
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