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Circuit knowledge about wind speed sensor

by:Rika Sensors     2021-09-30
Circuit knowledge about wind speed sensor
In the modern society that advocates environmental protection, people use 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. An instrument to measure wind speed. 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 circuit of the wind speed sensor and fully understand the wind speed sensor from its circuit.

1: Wind speed-frequency converter

The wind speed-frequency converter 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.

Suppose 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, then v'u003d2πR*n

The wind speed is k, let ku003dv/v', k is the wind speed conversion coefficient, this coefficient can be obtained through wind tunnel experiment, then: vu003dk*v'u003dk*2πr*n

Assuming that the number of uniformly-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 hole-opening disc rotates one circle from the middle of the photoelectric switch tube, a ten pulses will be generated, so the wind speed-frequency The frequency of the output pulse of the conversion circuit is: fu003da*nu003da/(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 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 for 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 realize high-precision F/V conversion. The relationship between the output voltage V1 and the input pulse frequency is: Vou003dK *Vcc*R2*C2*f

If an A/D converter and a display circuit are added to the output end 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 with a slight improvement, and its performance can exceed that of a tachogenerator.

The wind speed sensor RS-FS-N01 is small and light, easy to carry and assemble. The three-cup design concept can effectively obtain wind speed information. The shell is made of high-quality aluminum alloy profiles, and the exterior is electroplated and sprayed, which has good anti-corrosion , Anti-corrosion and other characteristics, can ensure that the transmitter is used for a long time without rusting phenomenon, and at the same time cooperate with the internal smooth bearing system to ensure the accuracy of information collection. It is widely used in wind speed measurement in greenhouses, environmental protection, weather stations, ships, wharves, breeding and other environments.

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. It is better The use of wind speed sensor makes it play a greater role.



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