3,218
edits
Difference between revisions of "Anemometers"
Jump to navigation
Jump to search
no edit summary
| Line 42: | Line 42: | ||
==Pressure anemometers== | ==Pressure anemometers== | ||
The first designs of anemometers which measure the pressure were divided into plate and tube classes. | The first designs of anemometers which measure the pressure were divided into plate and tube classes. | ||
==Plate anemometers== | ===Plate anemometers=== | ||
These are the earliest anemometers and are simply a flat plate suspended from the top so that the wind deflects the plate. In 1450, the Italian art architect Leon Battista Alberti invented the first mechanical anemometer; in 1664 it was re-invented by Robert Hooke . Later versions of this form consisted of a flat plate, either square or circular, which is kept normal to the wind by a wind vane. The pressure of the wind on its face is balanced by a spring. The compression of the spring determines the actual force which the wind is exerting on the plate, and this is either read off on a suitable gauge, or on a recorder. Instruments of this kind do not respond to light winds, are inaccurate for high wind readings, and are slow at responding to variable winds. Plate anemometers have been used to trigger high wind alarms on bridges.They are used on these high places because they are in a plate shape; has a good measurement status on higher altitudes. | These are the earliest anemometers and are simply a flat plate suspended from the top so that the wind deflects the plate. In 1450, the Italian art architect Leon Battista Alberti invented the first mechanical anemometer; in 1664 it was re-invented by Robert Hooke . Later versions of this form consisted of a flat plate, either square or circular, which is kept normal to the wind by a wind vane. The pressure of the wind on its face is balanced by a spring. The compression of the spring determines the actual force which the wind is exerting on the plate, and this is either read off on a suitable gauge, or on a recorder. Instruments of this kind do not respond to light winds, are inaccurate for high wind readings, and are slow at responding to variable winds. Plate anemometers have been used to trigger high wind alarms on bridges.They are used on these high places because they are in a plate shape; has a good measurement status on higher altitudes. | ||
===Tube anemometers=== | ===Tube anemometers=== | ||