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| image title | Anemometer |
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| caption | An anemometer is a device for measuring wind speed. Shown here is a common form that uses three or more evenly-spaced spokes each of which ends in a simple cup shape, mounted on a freely-rotating vertical shaft. Another type (not shown) uses a wind-driven propeller on a horizontal shaft. In both cases, the speed of rotation changes roughly in proportion to the wind speed and can be precisely calibrated. The rotation speed is easily measured electronically, for example, by using the shaft to chop a beam of light passing between a light-emitting-diode (LED) and a photo-diode (light sensor). |
| code | MI012 |
| Section | Meteorological instruments |
| Subsection | Surface-based instruments |
| image credit | © The Open University |
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