If the cup anemometer is mounted with the shaft perpendicular to the horizontal, it will measure only the component of the wind The cup anemometer (used in weather stations) measures the air velocity in a plane perpendicular to the axis of its rotation cups. The term anemometer was derived from the Greek words anemos, “wind,” and metron, “measure.” Mechanical anemometers wereįirst developed back in the 15th century to measure wind speed. "thermal anemometer" is often used to mean any anemometer that uses a relationship between heat transfer and velocity to determine velocity. Usually used when turbulence characteristics are being measured, such as transverse measurements in a cross-section. The vane anemometer, thermal anemometer and cupĪnemometer (typically used in weather stations) are mostly used to measure the mean velocity, while the hot wire anemometers are Less popular because their zero-flow reading is not stable, temperature and velocity response is slow, and temperature compensation is limited.Īn anemometer usually measures gas flows that are in turbulent flow conditions. Temperature is simply proportional to flowrate. Constant-temperature anemometers are popular because of their high-frequency response, low electronic noise level, immunityįrom sensor burnout when airflow suddenly drops, compatibility with hotfilm sensors, and their applicability to liquid or gasĬonstant-power anemometers do not have a feedback system.
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