At about three times the pipe diameter from the head, several small holes are opened around the pipe wall. At the top of the pitot tube head, facing the incoming flow, a small hole is opened, which is used to feel the total pressure of the fluid. The difference between the total pressure (stagnation pressure) of the flowing air and the static pressure, that is, the dynamic pressure, is used to measure the wind speed. It is composed of a total pressure probe and a static pressure probe. The Pitot tube is named after its inventor and French engineer Henri Pitot. The most commonly used pressure anemometer is the Pitot tube. The time response is fast, the sensitivity is high, and the minimum detection wind speed can reach a few centimeters per second.ĭisadvantages: the installation is more complicated and the price is more expensive. It will be a powerful substitute for mechanical anemometers.Īdvantages: no moving parts, no mechanical wear. Because it overcomes the inherent shortcomings of mechanical anemometers, it can work normally all-weather and for a long time, and it is more and more widely used. The ultrasonic anemometer is a more advanced instrument for measuring wind speed and direction. The air velocity can be obtained by measuring this time difference, that is, the air velocity measurement can be realized by measuring this time difference, which is the working principle of the ultrasonic anemometer. Therefore, within a certain distance, there is a difference between the time required for sound waves to propagate downwind and upwind. The propagation speed of sound waves in the actual atmosphere is equal to the sum of the propagation speed of sound waves in the static atmosphere and the airflow speed in the atmosphere. Secondly, this anemometer is expensive and costly.
ANEMOMETER WEATHER SOFTWARE
No special software is required.ĭisadvantages: The hot-wired anemometer is easily affected by the ambient temperature, and its temperature drift is one of the most important sources of error. Its time constant is only a few hundredths of a second, and it is an important tool for atmospheric turbulence and agrometeorological measurement.Īdvantages: It is a high-speed anemometer, which can be measured even at low speeds. The anemometer has high sensitivity at low wind speeds and is suitable for measuring small wind speeds. The direct heating type is mostly platinum wire, which can directly measure its temperature while measuring the wind speed. The indirect heating type is generally manganese copper wire, its resistance temperature coefficient is close to zero, and its surface is additionally equipped with temperature measuring elements.
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There are two types of wind speed: indirect heating and direct heating.
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