There are various methods for measuring the speed, three of which are briefly presented here. This stable wind vane is aligned by the wind like a textile vane or a weathercock on towers. A rotatable component – a wind vane – is often used to determine the wind direction. Each of them has advantages and disadvantages and is particularly suitable for certain applications or measuring ranges. Wind speed meters work according to different measuring principles. Wind speed meters also play an important role in recreational activities, water sports, gliding and ballooning. The information of the weather service usually refers to a height of 10 m and cannot take into account the local conditions influenced by the buildings and vegetation. When assessing the concrete danger situation, not only the wind warnings of the German Weather Service should be taken into account, but also local measurements with the wind speed meter as close as possible to the danger area. These include, for example, roofs, industrial chimneys and cranes, lifting platforms and scaffolding or areas with the trees that are at risk of falling. In construction and forestry, certain work must not be carried out in strong winds and the particularly risky because of wind areas must not be entered. This makes it easier to assess whether special precautions need to be taken against blowing away or whether it is better to postpone the work to another time. Wind measurements are also useful before and during certain work in agriculture, such as spreading fertilizers and seeds or mowing light cut material. There, a fan can be switched on automatically if the natural draught is not sufficient. Wind speed meters are also used on some ventilation systems and smoke outlets. On the buildings, the wind speed meters are also often used to retract the wind-sensitive attachments such as awnings and external blinds in the event of strong winds. The effects of the noise, exhaust gases and odours on the neighboring areas depend not only on their distance, but also on the wind strength and direction.
They are also needed in determining locations for wind power plants and in assessing the emissions from traffic, industry and agriculture. Wind speed meters are not only used for accident prevention and traffic control in the road, air and shipping traffic.
With the degree indication, the north direction corresponds to zero degrees, the east direction to ninety degrees and the west direction to 270 degrees. Instead of indicating the cardinal directions with 16 divisions, such as east-northeast, the direction is often indicated as the number of degrees of a 360-degree circle. The wind direction is determined according to the compass direction from which the wind comes. It is practical if the wind speed meter displays the data directly in the required unit. In Anglo-Saxon-speaking countries, the units miles per hour and feet per minute are also frequently used. One node corresponds to one nautical mile per hour. These include metres per second, kilometres per hour and, in maritime and aviation nodes. The wind speed is expressed either as wind force according to Beaufort or in common speed units. Electronic wind speed meters can measure either wind direction, wind speed or both. Some wind speed meters are equipped with interfaces that allow direct control of acoustic warning systems or other devices depending on the wind strength. At helipads and airfields, they inform the pilots taking off and landing about the current wind situation.ĭigital wind speed meters seldom offer this recognizability over long distances, but they do offer the possibility to show the data digitally on a display, to store it electronically and to transmit it. This indicator, which can be seen over long distances, helps the road users on the road sections and bridges under threat of crosswinds to adapt their driving style to the wind conditions timely. When the wind force is five and above, the windsock is horizontal, at wind force three it bends after the third ring. Each of the three red and two white rings corresponds to 1 wind force according to Beaufort scale.
They show how strong the wind is and from which direction it is blowing, and are easily recognizable even from long distances. Many people know the red-and-white-striped windsocks as simple wind speed meters.
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