What is the circuit knowledge of wind speed sensor?

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

 1. 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-shaped photoelectric switch tube and a uniform opening disc rotating with the wind cup.

　　 Let the center velocity of the center point of the wind cup be 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

　　 Let the wind speed be, let k=v/v’, and k be the conversion factor of wind speed, which can be obtained by wind tunnel experiment

　　  Rule: v=k*v’=k*2πr*n

Set the number of evenly-opening slots of the light-shielding disc as a, then after the slot-shaped photoelectric switch tube is applied with normal voltage, every time the opening disc rotates one circle from the middle of the photoelectric switch tube, a ten-pulse wind speed will be generated- 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, and the sensitivity of the "wind speed-frequency converter" can be improved by adjusting the distance between the rotating 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 components are required to achieve high-precision F/V conversion. The relationship between the output voltage V1 and the input pulse frequency is: Vo=K *Vcc*R2*C2*f

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

The circuit of the wind speed sensor seems 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 the wind speed. This measurement method also changes the previous wind speed sensor. The measurement method makes the measurement of wind speed safer and more accurate. Let us have a certain understanding of the wind speed sensor, know how to use the wind speed sensor in life, to achieve value for money and use.

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