anemometret

An anemometre is an instrument used for measuring wind speed. The most common type is the cup anemometre, which consists of three or four hemispherical cups mounted on arms that rotate around a central spindle. The wind catches the cups, causing them to spin at a speed proportional to the wind's velocity. The rotation is then converted into an electrical signal, which is displayed on a meter or recorded by a data logger.

Other types of anemometres include the vane anemometre, which uses a propeller-like rotor, and the hot-wire anemometre, which measures the cooling effect of the wind on a heated wire. Pressure-plate anemometres use a plate that is pushed by the wind, and sonic anemometres measure wind speed by timing the passage of sound pulses.

Anemometres are used in a variety of applications, including meteorology, aviation, wind energy, and sailing. They help in forecasting weather, guiding aircraft, assessing potential for wind power generation, and navigating ships. Accuracy and reliability are crucial for these instruments, and they are often calibrated regularly. Different anemometre designs are suited for different conditions and measurement needs.