Anemometer, what is it and which one to choose at the best price?

November 2, 2021

An anemometer is a tool used to measure wind speed, and it is also a common weather station instrument. The term is derived from the Greek word anemos, which means wind, and is used to describe any wind speed instrument used in meteorology. The first known description of an anemometer was given by Leon Battista Alberti in 1450.

The most widely used to measure wind speed is the rotating cup electric anemometer, in which the rotating cups drive an electrical generator. The generator output operates an electrical meter that is calibrated for wind speed. The useful range of this device is approximately 5 to 100 knots. A propeller can also be used to drive the electric generator, as in the propeller anemometer.

In another type of wind-driven unit, the rotating blades operate a counter, the revolutions are timed by a stopwatch and converted to airspeed. This device is especially suitable for the measurement of low air speeds.

For safety reasons, recreational planning and curiosity, know the speed of the weather at any time, or at least the direction it is blowing, if for some reason you cannot get out to detect this with your own senses, in your area, or in a place you plan to travel to soon, it is useful information.

There are many different types of anemometers available for this purpose, some of which rely on especially clever methods to indirectly measure wind speed.

Next, we will talk about this interesting type of laboratory instrument, such as the beaker . Join us!

What is the anemometer?

Although it is a strange word, anemometer refers to a simple, but surprisingly versatile, laboratory instrument found in the most basic weather stations in the world.

The most common type of anemometer has three or four cups attached to the horizontal arms. The arms are attached to a vertical bar. When the wind blows, the cups rotate, spinning the rod.

The stronger the wind blows, the faster the reed that is included in the device turns. The anemometer counts the number of rotations or turns, which is generally used to calculate wind speed . Because wind speeds are never consistent, wind speed is generally averaged over a short period of time.

Wind speed can also be determined by measuring air pressure. The air pressure itself is measured by an instrument called a barometer. A tube anemometer uses air pressure to determine wind pressure or speed. A tube anemometer also measures the air pressure inside a glass tube that is closed at one end. By comparing the air pressure inside the tube with the air pressure outside the tube, the wind speed can be calculated.

History of the anemometer

The first known anemometer has been developed by Battista Alberti, which was mechanical and was built around 1450. Since then, until now, the model has changed significantly. In the centuries that followed, many others, including Robert Hooke, developed their own versions, and some were wrongly credited as the inventor. In 1846, John Thomas Romney Robinson improved the design by using four hemispherical cups and mechanical wheels.

During 1926, Canadian meteorologist John Patterson developed a three-cup anemometer, which Brevoort and Joiner later improved upon in 1935. In 1991, Derek Weston added the ability to measure wind direction. In 1994, Andrews Pflitsch developed the sonic anemometer.

Uses of the anemometer

Anemometers are used in almost all weather stations, from the cold Arctic to the warm equatorial regions. Wind speed helps indicate a change in weather patterns, such as an approaching storm, which is important to pilots, engineers, and climatologists. Aerospace physicists and engineers often use laser anemometers.

This type of anemometer is used in velocity experiments. Velocity is the measure of the speed and direction of change in the position of an object. Laser anemometers calculate the wind speed around cars, airplanes, and spacecraft, for example. Anemometers help engineers make these vehicles more aerodynamic.

How the anemometer works

The cup and propeller style anemometer is, as noted, the most common type; fortuitously, its operation is easy to explain. As the wind rotates the propeller arm, the wind-trapping cups rotate through a circle of known radius at a known time, such as the center bar is counted turns. The total distance of revolutions per circumference divided by time is the wind speed.

Types of anemometer

Cup anemometer

This is a simple anemometer that was built and invented by John Thomas Romney. The device consisted of about four cups mounted on the horizontal arms of the anemometer, which were on a vertical axis. The flow that gave off the air that came from any direction, rotated according to the axis of a speed that was proportional to the one normally known from the wind.

To count the turns that this axis made during a set period of time, it resulted that the value proportional to the average speed could be measured according to a range of speeds. Which was wide. It also became known as a rotational anemometer, this due to the way it was used to measure the wind.

Pallet anemometer

Known as a velocity anemometer, it is just another tool for measuring the wind with a paddle. Generally speaking, it functioned as a windmill or similar to a propeller anemometer. Unlike other anemometers, whose axis of rotation is vertical, this one that has a vane uses an axis parallel to the direction in which the wind was approaching.

Hot wire anemometer

The wire anemometers, which are very delicate and therefore not very practical, have an extremely high frequency response capacity. It also features fine spatial resolution compared to other measurement alternatives. Therefore, it is universally used for the detailed study of turbulent flows consisting of fast velocity.

A more practical version of the wire anemometer is known as the wire flow meter. Which follows the same operating principle, but uses two pegs or strings to control the temperature variation.

Anemometer doppler laser

The Doppler anemometer has a device known as a light beam that splits into two beams. the former is propagated from the anemometer itself, with particles or seed materials flowing along with the molecules found in the air. The other scatters the light back to a detector, which is where the ratio of the original beam that has been measured is measured.

Ultrasonic anemometer

The ultrasonic anemometer, which dates back to about 1950, uses a series of sound waves to measure wind speed. This is an option known as a function of the time of flight of the sonic pulses. Pair measurements can be combined to obtain a better measurement. The speed oscillates the 1, 2 or 3 dimensions. It depends on the experiment you want to perform. The spatial resolution is given by the longitude. In general between 8 and 18 cm.

Acoustic resonance anemometer

The resonance anemometer is one of many versions of other anemometers that uses sonic versions. The idea came from Savvas Kapartis, and the registration of the tool is dated from the year 1999. Resonance sensors use a series of acoustic waves, worth redundancy, in a small cavity to perform their measurement.

Plate anemometer

It is known as a modern anemometer, and in general, it consists of a flat plate that is suspended in the upper part in which the wind deflects the plate to which it is built. Its invention is dated to the year 1450, in which the architect Battista shaped the first modern anemometer. The versions that followed these tools consisted of a flat plate, either square or circular, which acted as a normal weather vane against the wind. The pressure exerted by the wind was balanced by a spring.

Tube anemometer

The tube anemometer, which was invented by James Lind in 1775, was designed in a U-shape, with a glass tube, with a liquid manometer. It consisted, in general terms, of a bent end that was in a horizontal direction to face the wind and the other parallel end according to the flow of the wind.

Location of the anemometer

So that the speed that the wind carries can be measured, from one place to another, it is necessary to take into account the place where the device is located. Since factors such as trees, nature, or other canyons, whether natural or artificial, can affect the measurement.

Dr. Loony Davis5
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Born and raised in Brussels in an English family, I have always lived in a multicultural environment. After several work experiences in marketing and communication, I came to Smart Water Magazine, which I describe as the most exciting challenge of my career.
I am a person with great restlessness and curiosity to learn, discover what I do not know, as well as reinvent myself daily, someone who is curious about life and wants to know. I enjoy sharing knowledge.
This is my personal project but I also collaborate in other blogs, it is the case, the most important web on water currently exists in the US, if you are interested you can read my articles here.

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