Wind speed sensor design principle and characteristics

Wind anemometer is composed of wind direction wind speed sensors. Wind direction wind speed sensors are mainly responsible for sensing wind direction and wind speed, and measuring wind direction and wind speed in time. What are the types of wind direction sensors?

At present, wind speed sensors at home and abroad can be divided into three categories. The first type is the propeller type wind direction wind speed sensor; the second type is the wind speed is the three cup type, the wind direction is the single wing type wind direction wind speed sensor; The third kind is the ultrasonic wind direction wind speed sensor. Propeller wind sensors have poor accuracy and general dynamic performance; ultrasonic wind sensors are not yet mature at present. Wind direction wind speed sensor is the main component of the wind direction wind speed monitor and is the core of the whole instrument. In addition, wind speed sensors are also used in hand-held weather stations.

The working principle of the wind cup type wind speed sensor is: the sensing element of the wind speed sensor is a three-cup rotary type, and the signal conversion circuit is a Hall switch circuit. Under the action of horizontal wind, the wind cup group rotates, the magnetic rod disk rotates through the main shaft, and 36 magnetic elements on it form 18 small magnetic fields. When the wind cup group rotates once, 18 pulses are induced in the Hall switch circuit. The signal, whose frequency increases linearly with the increase of wind speed. The calibration equation is: V = 0.1F (V: wind speed, unit: m/s; F: pulse frequency, unit: Hz.).

The sensing element of the wind direction sensor is a wind vane component. The angle is changed to Gray code disk plus optoelectronic circuit. When the wind vane assembly rotates with the wind direction, the main shaft and the code wheel are driven to rotate together. Each rotation of 2.8125°, the 7-bit photoelectric conversion circuit located on the upper and lower sides of the photoelectric device support outputs a new set of 7-bit parallel Gray code, and is shaped by the shaping circuit. Inverted output. The sensor has good dynamic characteristics, good linearity, high precision, high sensitivity (3°; 0.1 m/s), high wind resistance (≤70 m/s), wide measuring range (0~60 m/s), interchangeability Good performance, reliable work, strong resistance to lightning and other excellent performance. The wind cups are injection molded from special engineering plastics. The wind vane tail fins are made of non-metal materials with light weight, high strength, good rigidity and molding under high temperature and high pressure conditions. With light weight, good strength, strong wind resistance and other characteristics.