Anemometer is an instrument used to measure wind speed. There are many types of anemometers and measurement principles (i.e. rotating cup, hot wire, ultrasonic,…). The most common being a 3 cup anemometer.
For indoor applications and for very low air speed measurement, hot wire anemometers are preferred.
In freezing climates and icing conditions, ultrasonic anemometers are the best, but they come with a high price tag and large power consumption requirements.
For most outdoor applications where wind speeds range from a breeze to a hurricane, cup anemometers like the MeteoWind have become the most prevalent and work very well. Advantages of a cup anemometer are its accuracy and low power consumption relative to its cost.
There are many types of cup anemometers of many different shapes and sizes. However only two anemometer cup shapes can be considered accurate and unfortunately the most commonly used spherical cups or hemispherical cups are not among them.
The most accurate cup shapes used to date are conical and elliptical. Elliptical anemometer cup shape is a relatively new idea introduced by Barani Design and offers certain advantages over the conical shape (i.e. is significantly less effected by angled flow than a conical cup when mounted near a hill or a house). Elliptical cups also have better snow dissipation properties than conical cups when used in adverse weather conditions.
More about the advantages of using elliptical anemometer cups can be read at Elliptical Anemometer Advantage.
Article also available in: Arabic