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What is an anemometer?
Many customers have the doubt on what is an anemometer used for. This article is to clearity what an anemometer is, types of the anemometer, and what it used for.
The anemometer is an instrument for measuring the wind speed, professional wind sensors of weather station.
The anemometer is suitable for coal mines, underground mines and other flammable and explosive places to accurately measure the instantaneous wind speed and one-minute average wind speed;
it is also suitable for transportation, construction, chemical industry, food processing, aerodynamics research wind speed measurement in other occasions.
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The basic principle of an anemometer is to put a thin metal wire in a fluid, and apply current to heat the metal wire to make its temperature higher than the temperature of the fluid. Therefore, the wire anemometer is called a "hot wire". When the fluid flows through the metal wire in the vertical direction, it will take away a part of the heat of the metal wire, and the temperature of the metal wire will drop. According to the theory of forced convection heat exchange, it can be derived that there is a relationship between the heat Q lost by the heating wire and the velocity v of the fluid.
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1. Wind cup anemometer
It is the most common type of anemometer. The cup-rotating anemometer was first invented by Rubinson, England. At that time, it was four cups, and later it was changed to three cups. The three parabolic or hemispherical empty cups that are fixed to each other on the frame are all along one side, and the entire frame and the wind cup are mounted on a freely rotating shaft. The wind cup rotates around its axis under the action of wind, and its speed is proportional to the wind speed;
2. Propeller anemometer
It is an anemometer with a set of three-blade or four-blade propellers rotating around a horizontal axis. The propeller is installed on the front of a weathervane so that its rotating plane is always facing the direction of the wind anemometer, and its speed is proportional to the wind speed;
3. Pressure anemometer
The pressure effect of wind (wind pressure is inversely proportional to the square of the wind speed) to measure wind speed;
4. Thermal anemometer
Use the characteristic that the heat dissipation rate of the heated object has nothing to do with the surrounding air velocity to measure the wind speed;
5. Acoustic anemometer
Use the functional relationship between the speed of sound waves in the atmosphere and the wind speed to measure wind speed;
6. Ultrasonic anemometer
A wind speed and direction measuring instrument that uses the sending of sound pulses to measure the difference in time or frequency at the receiving end to calculate wind speed and direction.
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Applications of anemometer
1. Agriculture meteorological station;
2. Weather monitoring for seaport, expressway;
3. High-altitude facility;
4 Greenhouse weather station;
5 Coal mines