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What is the difference between wind speed sensor and air volume sensor

by:Rika Sensors     2021-08-21
What is the difference between wind speed sensor and air volume sensor
The difference between the wind speed sensor and the air volume sensor starts from the wind speed and wind direction.

Wind speed refers to the velocity of air relative to a fixed location on the earth. The common unit is m/s, 1m/s u003d 3.6 km/h. Wind speed has no grade, only wind has a grade, and wind speed is the basis for the classification of wind grades. Generally speaking, the higher the wind speed, the higher the wind level, and the more destructive the wind. Wind speed is one of the main parameters of climatological research. The measurement of wind in the atmosphere plays an important role and significance in global climate change research, aerospace industry and military applications.

Air volume refers to the amount of air circulating in a unit of time. It is generally used to indicate the capacity of a blower or ventilation device. The unit of calculation is cubic meters per second. When the material of the heat sink is the same, the air volume is the most important indicator to measure the heat dissipation capacity of the air-cooled radiator. Obviously, the larger the air volume, the higher the heat dissipation capacity of the radiator. This is because the heat capacity of the air is constant, and the greater the air volume, that is, the more air per unit time can take away more heat. Of course, the heat dissipation effect is related to the way the wind flows under the same air volume.

Wind speed and air volume are not the same, but there is a certain correlation between the two. The air volume is equal to the product of the wind speed and the cross-sectional area of u200bu200bthe orifice. Therefore, the data of the air volume sensor is mostly converted from the measurement data of the wind speed sensor.

The specific conversion method is:


In the formula: L means air volume F means air outlet ventilation area V means The measured average wind speed of the tuyere

The wind cup type wind speed sensor is a very common wind speed sensor, first invented by Ruby Sun in the UK. The sensing part is composed of three or four cone-shaped or hemispherical empty cups. The hollow cup shells are fixed on the three-pointed star-shaped brackets which form 120° each other or the cross-shaped brackets which form 90° each other. The concave surfaces of the cups are arranged in one direction, and the entire cross arm frame is fixed on a vertical rotating shaft.

When the wind blows from the left, the wind cup 1 is parallel to the wind direction, and the force component of the pressure on the wind cup 1 in the direction most straight to the axis of the wind cup is approximately zero. Wind cups 2 and 3 intersect with the wind direction at an angle of 60 degrees. For wind cup 2, its concave surface faces the wind and bears the greatest wind pressure; wind cup 3 has a convex surface facing the wind, and the wind's circumfluence makes it bear the wind pressure It is smaller than the wind cup 2, because the pressure difference between the wind cup 2 and the wind cup 3 in the direction perpendicular to the axis of the wind cup, the wind cup starts to rotate in a clockwise direction. The greater the wind speed, the greater the initial pressure difference. The greater the acceleration, the faster the wind cup rotates.

After the wind cup starts to rotate, because the cup 2 rotates in the direction of the wind, the wind pressure is relatively reduced, while the cup 3 rotates at the same speed against the wind, and the wind pressure is relatively increased. The difference continues to decrease. After a period of time (when the wind speed is constant), when the partial pressure difference acting on the three wind cups is zero, the wind cups rotate at a uniform speed. In this way, the wind speed can be determined according to the speed of the wind cup (the number of turns per second).

When the wind cup rotates, it drives the coaxial multi-tooth cutting disc or magnetic rod to rotate, and a pulse signal proportional to the speed of the wind cup is obtained through the circuit. The pulse signal is counted by a counter and can be obtained after conversion Actual wind speed value. At present, the new rotor anemometer adopts three cups, and the performance of the cone cup is better than that of the hemispherical cup. When the wind speed increases, the rotor cup can quickly increase the speed to adapt to the airflow speed. When the wind speed decreases, due to the influence of inertia, the speed However, it cannot drop immediately. The wind speed indicated by the rotary anemometer in gusty wind is generally too high and becomes an excessive effect (the average error produced is about 10%).

The wind speed sensor RS-FSJT-N01 adopts the three-cup design concept. The shell is made of polycarbonate composite material, which has better temperature resistance, weather resistance, and weather resistance compared with ordinary ABS plastic materials. It can ensure that the sensor is used outdoors for a long time without rusting, and it is matched with a smooth internal bearing system. , To ensure the accuracy of information collection.

The wind speed sensor generally works outdoors. The outdoor environment is bad, and rain and snow may be encountered at any time. The wind speed sensor is carefully designed with bearing caps, which can be rain and waterproof, the protection level is improved, and the working performance is more stable, without the bearing caps. The product is easy to seep water in rainy and snowy weather, causing damage to the circuit board.

In order to adapt to a variety of installation environments, the wind cup type wind speed sensor has two outlet methods, bottom outlet and side outlet, which can adapt to various installation environments and improve the performance of rain and snow.

At present, the wind cup type wind speed sensor is widely used in the wind speed measurement of greenhouses, environmental protection, weather stations, ships, docks, breeding and other environments.

Collectively, the effect of sensor solution on industrial society has been to eliminate OEM sensor and drastically reduce the time long associated with environmental monitoring systems.
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