Measure the wind speed of a meter, air flow filter will occur after a pressure difference, this pressure difference and the speed of airflow is proportional to the greater the wind speed, the greater the pressure difference, based on the correspondence between the two to calibrate the wind speed; there is another is similar to the fluid dynamics of the venturi, airflow impact to the force plate, the impact force and wind speed is proportional to the impact force to calibrate the wind speed.
Measurement of wind on the ground
Wind is the horizontal movement of air.
The observation of wind in climate includes both wind direction observation and wind speed observation. The wind direction is the direction of the horizontal air flow, which is shown by 16 geographical directions in the ground climate observation. Wind speed is the interval through which the air passes per unit time, in m/s.
Wind measurement in addition to the braking wind speed, wind direction, the main is to use the arithmetic average method or vector average method to calculate the average wind speed, wind direction, or use more wind direction instead of the average wind direction. The average wind usually refers to the time average of the braking wind, and the difference between the instantaneous wind and the average wind that is the pulsating wind.
Wind direction measurement with wind vane, and with mechanical transmission, electrical transmission and photoelectric conversion and other self-registered way to record the wind direction changes in real time.
Wind speed measurement with anemometer (or anemometer).
There are some types of anemometer
(1) Rotary anemometer (anemometer);
(2) Pressure anemometer: the application of wind pressure effect (wind pressure and wind speed squared proportional to) to measure the wind speed;
(3) Thermal anemometer: the application of the heated object heat dissipation rate and the surrounding air flow rate related to the characteristics of the measurement of wind speed;
(4) Acoustic anemometer: the application of sound waves in the atmosphere to measure wind speed as a function of the speed of flow between the relationship between the wind speed.
The wind speed measurement error is large, which is critically formed by the hysteresis effect of the anemometer (anemometer).