Difference between wind speed sensor and air flow sensor
The difference between the wind speed sensor and the wind sensor, to start from the wind speed and wind volume.
Wind speed, is the air relative to a fixed location on the earth's rate of movement, the common unit is m / s, 1m / s = 3.6 km / h. Wind speed does not have a grade, the wind only have a grade, the wind speed is the basis for the division of the wind level. Generally speaking, the greater the wind speed, the higher the wind level, the greater the destructiveness of the wind. Wind speed is one of the main parameters of climatological research, and the measurement of wind in the atmosphere has an important role and significance for global climate change research, aerospace industry and military applications.
Wind volume, the volume of air circulating per unit of time, is generally used to indicate the capacity of a blower or ventilation equipment and is calculated in cubic meters per second. In the case of the same material of the heat sink, the air volume is the most important index to measure the cooling ability of the air-cooled heat sink. Obviously, the higher the airflow, the higher the heat dissipation capacity of the radiator. This is because the heat capacity of the air is certain, a larger air volume, that is, more air per unit time can take away more heat. Of course, the cooling effect of the same air volume is related to the way the wind flows.
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 wind speed and the product of the cross-sectional area of the vent, so most of the data of the air volume sensor is based on the measured data of the wind speed sensor is converted.
The specific conversion is:
L (m? / h) = 3600 * F (㎡) * V (m / s)
Where: L indicates the air volume F indicates the ventilated area of the air outlet V indicates the measured average air velocity of the air outlet
Wind cup wind speed sensor, is a very common wind speed sensor, first invented by the British Rubinson. The sensing part is composed of three or four conical or hemispherical hollow cups. The hollow cups are fixed on a trident star-shaped bracket at 120° to each other or on a cross-shaped bracket at 90° to each other, with the concave surfaces of the cups aligned in one direction, and the whole cross-arm frame is fixed on a vertical rotating axis.
When When the wind is blowing from the left, the wind cup 1 is parallel to the wind direction, and the pressure of the wind on the wind cup 1 is approximately zero in the direction of the axis of the wind cup. Wind cup 2 and 3 with the wind direction into a 60-degree angle of intersection, for the wind cup 2, the concave side of the wind, the wind pressure to withstand the largest; wind cup 3 of its convex side to face the wind, the wind flow around the role of the wind pressure than the wind cup 2 is small, due to the wind cup 2 and the wind cup 3 in the perpendicular to the direction of the wind cup axis of the pressure difference, and so that the wind cup began to rotate in a clockwise direction, the greater the speed of the wind, the greater the pressure difference between the beginning of the greater the acceleration produced by the larger, the wind cup rotation The greater the wind speed, the greater the initial pressure difference, the greater the resulting acceleration, the faster the cup rotation.
After the wind cup begins to rotate, because the cup 2 rotates in the direction of the wind, the pressure of the wind is relatively reduced, and the cup 3 facing the wind to the same speed of rotation, the wind pressure is relatively increased, the wind pressure difference decreases, after a period of time (when the wind speed is unchanged), the action of the three cups of the pressure difference of zero, the wind cup will become a uniform speed rotation. According to the rotational speed of the wind cup (the number of revolutions per second) can determine the size of the wind speed.
When the wind cup rotates, drive the coaxial multi-tooth cut-off disc or magnetic bar rotation, through the circuit to get and the wind cup speed is proportional to the pulse signal, the pulse signal counted by the counter, after conversion can be derived from the actual wind speed value. At present the new rotating cup anemometer are used three cups, and conical cup performance than hemispherical good, when the wind speed increases the rotating cup can quickly increase the rotational speed to adapt to the air speed, wind speed decreases, due to the impact of inertia, the speed can not be immediately decreased, the rotating anemometer in the gusts of wind indicate the wind speed is generally on the high side to become too high effect (resulting in an average error of about 10 percent).
The Kenda Rinko wind speed sensor RS-FSJT-N01 adopts the three-cup design concept. The shell is made of polycarbonate composite material, compared with ordinary ABS plastic material has better temperature resistance, weather resistance, weather resistance, can ensure that the sensor in the outdoor long-term use without rust cut phenomenon, while with the internal smooth bearing system, to ensure the accuracy of information collection.
Wind speed sensors generally work outdoors in harsh outdoor environments and may encounter rain or snow at any time, JD Rinko wind speed sensors are carefully designed with bearing brims, which are rainproof and waterproof, with improved protection level and more stable performance, while products without bearing brims are prone to water seepage in rain or snow, resulting in damage to the circuit boards.
In order to adapt to a variety of installation environments, JD Renke wind cup type wind speed sensor has bottom outlet and side outlet two kinds of wiring, to adapt to a variety of installation environments while improving the performance of rain and snow.
