What is the circuit knowledge of the wind speed sensor?

In the modern society that promotes environmental protection, people use more natural energy, such as solar energy, wind energy, etc., but when using wind energy, they also need an instrument to control it, so a wind speed sensor is produced, which is used to measure wind speed. Of an instrument. For this kind of sensor, some people may be unfamiliar with its working principle and have no idea about its circuit. Therefore, it is necessary for us to learn about the wind speed sensor circuit and fully understand the wind speed sensor by its circuit.

One: Wind speed-frequency converter

Wind speed-frequency conversion electricity is the core part of the wind speed sensor, which is mainly composed of a slot-type photoelectric switch tube and a uniformly perforated disk that rotates with the wind cup.

Assuming that the center speed of the center point of the wind cup is v’, the distance from the center of the rotating shaft to the center of the wind cup is R, and the wind cup rotates n times per second,

v’=2πR*n

Suppose the wind speed is, let k=v/v’, and k is the wind speed conversion coefficient. The teacher of this department can find out through wind tunnel experiment

then: v=k*v’=k*2πr*n

Assuming that the number of uniform opening slots in the light-isolating disc is a, after the slot-type photoelectric switch tube is applied with a normal voltage, every time the opening disc rotates one circle from the middle of the photoelectric switch tube, a ten pulses will be generated, so the wind speed—— The frequency of the output pulse of the frequency conversion circuit is: f=a*n=a/(2πk*R)*v

Obviously the output pulse frequency is proportional to the wind speed signal. In practical applications, the value is generally several tens. The sensitivity of the "wind speed-frequency converter" can be improved by adjusting the distance between the shaft and the center of the wind cup.

2: Frequency-voltage conversion circuit

The function of the wind speed sensor is to convert the wind speed signal into a voltage signal output. Therefore, the pulse signal output by the photoelectric switch tube must be converted into a voltage signal by the F/V converter. LM2907 is a dedicated F/V conversion integrated circuit with high accuracy and low cost. Only a small number of external components can achieve high-precision F/V conversion. The relationship between output voltage V1 and input pulse frequency is: Vo=K *Vcc*R2*C2*f

If an A/D converter and a display circuit are added to the output of the F/V converter, it is convenient to form an anemometer. This circuit can also be used as a speed sensor in an automatic speed regulation system after a slight improvement, and its performance can exceed that of a tachogenerator.

The circuit of the wind speed sensor looks complicated, but it is actually well understood. Through the circuit of the wind speed sensor, we can fully understand its working principle and know how it measures wind speed. This measurement method has also changed the previous wind speed The method of measurement makes the measurement of wind speed safer and more accurate. It also allows us to have a certain understanding of the wind speed sensor, and know how to use the wind speed sensor in our lives to achieve value for money.

If you want to know more, our website has product specifications wind speed sensor, you can go to ALLICDATA ELECTRONICS LIMITED to get more information