how do wind sensor works and why is this invented?
Answers (3)
They generally have a cup on a vertical pole that can rotate. The cup catches the wind and starts the pole rotating. The faster it rotates, the faster the gust. Like sc89 says, wind speed (and predictions of wind speed) are really important for all those people listed.
One other use is in prediction (or meteorology). To work out how air pressure and weather fronts affect cloud, wind, and temperature, you have to measure all those variables and then analyse the data.
The wind sensor can continuously monitor the wind speed and air volume (air volume = wind speed x cross-sectional area) of the above locations, and can display the wind speed and air volume of the roadway in real time. It is an important instrument for measuring the safety parameters of mine ventilation. The sensor assembly is composed of a wind speed sensor, a wind direction sensor and a sensor bracket. It is mainly applicable to all mine ventilation main return air passages, air outlets, downhole main wind measurement stations, fan blower wellheads, heading face, coal mining face, etc., and corresponding mineral enterprises.
its' work principle is as followed:
Ultrasonic eddy measurement principle
The ultrasonic wind speed sensor uses the ultrasonic time difference method to measure the wind speed. The speed at which sound travels in the air is superimposed on the speed of the airflow. If the ultrasonic wave travels in the same direction as the wind direction, its speed will increase. Conversely, if the ultrasonic wave travels in the opposite direction to the wind direction, its speed will be slower. Therefore, under fixed detection conditions, the speed at which ultrasonic waves propagate in the air can correspond to the wind speed function. Accurate wind speed and direction can be obtained by calculation. Since sound waves propagate in the air, its velocity is greatly affected by temperature; this anemometer detects two opposite directions on the two channels, so the effect of temperature on the speed of sound waves is negligible.
Principle of differential pressure change
A fixed obstacle (orifice, nozzle, etc.) is placed in the flow direction so that a pressure difference is generated depending on the flow rate. By measuring the differential pressure, it can be converted into a measurement of the flow rate.
Principle of heat transfer
According to the Karman vortex theory (see Figure 1), an infinitely long nonlinear resistance body (ie, vortex generator C, probe crossbar of the wind speed sensor) is inserted vertically into the infinite boundary flow field, and occurs when the wind flows through the vortex In the case of the body C, two rows of alternating, internally swirling vortex rows (i.e., airflow vortices) are generated on the downstream side of the vortex generating body edge, and the frequency f of the vortex is proportional to the flow velocity V, which is expressed as follows:
f=St V/d;
Therefore, the ultrasonic wind speed sensor uses the principle of ultrasonic vortex modulation to determine the vortex frequency.