The Gill UVW Anemometer measures the
three orthogonal vectors of the wind: along
wind component “U”, across wind component
“V”, and vertical wind component “W”.
The three Propeller Anemometer sensors
are mounted at right angles on a common
mast. Each sensor measures the wind component
parallel with its axis of rotation. Propeller
response as a function of wind angle approximates
the cosine law, allowing true wind
velocity and direction to be calculated.
The UVW Anemometer is designed for
maximum sensitivity at lower wind speeds.
Optional carbon fiber thermoplastic (CFT)
propellers are available for applications
requiring greater range and durability. Rain
and dust are excluded from the precision
bearings by a continuous duty air blower
that keeps the instrument under a slight
positive pressure.
The Propeller Anemometer is a precision air speed measuring instrument.
The four blade helicoid propeller drives a miniature tach-generator. Output
voltage is directly proportional to the axial component of the wind speed.
Signal polarity indicates direction of propeller rotation. The Propeller
Anemometer is also available with single or dual direction photochopper
transducer. The Propeller Anemometer is especially suited for measuring
the vertical wind componenet. Since normal wind direction seldom exceeds
±30º from horizontal, propeller response can be calibrated to follow the
cosine law within 3% over this range.