Wind speed: the traditional three-ring rotating frame structure is adopted, and the output frequency of the wind speed sensor is sampled and calculated by the single chip microcomputer in the instrument. Finally, the instrument outputs instantaneous wind speed, one-minute average wind speed, instantaneous wind grade, one-minute average wind grade, average wind speed and corresponding wave height. The measured parameters are directly displayed on the LCD through numbers.
The sensitive element of the wind speed sensor is a three-cup wind assembly, which consists of three carbon fiber wind cups and a cup holder. The converter is a multi-tooth rotor and a slit optical coupler. When the wind cup rotates under the action of horizontal wind, the frequency signal is output through the rotation of the rotor cup of the shaft in the slit optical coupler.
The converter of the wind direction sensor is a code wheel and a photoelectric module. When the wind vane rotates with the change of wind direction, the shaft drives the code wheel to rotate in the gap of the photoelectric module. The generated photoelectric signal corresponds to the gray code output of the current wind direction. The transducer of the sensor can adopt a precision conductive plastic potentiometer, thus generating a variable voltage signal output at the movable end of the potentiometer.
Extended data:
The wind direction part is supported by the rebound thimble that protects the wind direction plate. The whole structure is composed of wind vane, wind shaft and wind disk. The magnetic bar installed on the wind vane and the wind vane form a magnetic compass to determine the wind direction.
When the locking knob is pulled down and rotated to the right, the rebound ejector pin lowers the wind direction dial, so that the tapered gem bearing contacts the shaft tip, and the wind direction dial will automatically point to the north.
The wind direction indication is determined by the stable position of the wind direction pointer on the wind direction dial. When the locking knob rotates to the left and rebounds upward, the rebound ejector pin lifts and locates the fan disc at the upper part of the instrument, and separates the tapered gem bearing from the shaft tip to protect the fan disc, bearing and shaft tip from damage.
The working principle of ultrasonic anemometer is to measure wind speed by ultrasonic time difference method. The propagation speed of sound in the air will be superimposed with the airflow speed in the wind direction. If the propagation direction of ultrasonic wave is the same as the wind direction, its speed will be accelerated; On the contrary, if the ultrasonic wave travels in the opposite direction to the wind direction, its speed will slow down.
Therefore, under the fixed detection conditions, the propagation speed of ultrasonic waves in the air can correspond to the wind speed function. Accurate wind speed and direction can be obtained by calculation. Because when sound waves propagate in the air, the speed is greatly influenced by temperature; The anemometer detects two opposite directions on two channels, so the influence of temperature on sound wave velocity can be ignored.
Baidu encyclopedia-wind direction and anemometer