Wind direction and anemometer are used to measure instantaneous wind speed and direction
Wind direction and anemometer are used to measure instantaneous wind speed and direction, with automatic display function. It is mainly composed of a pole, a wind vane, a wind cup, and a wind speed and direction sensor. The direction of the wind vane is the direction of the incoming wind. The wind speed is calculated based on the rotation speed of the wind cup. Therefore, it is also called wind cup wind direction anemometer.
Test Methods
This method is to test the resistance change produced when the sensor is cooled by the wind when it is powered on, thereby testing the wind speed. No information about wind direction can be obtained. In addition to being easy to carry and convenient, it has a high cost-performance ratio and is widely used as a standard product of anemometers. Thermal anemometers use platinum wire, thermocouples, or semiconductor elements, but our company uses platinum coiled wire. The material of platinum wire is physically stable. Therefore, it has advantages in terms of long-term stability and temperature compensation.
1. Wind direction part
The wind direction section is supported by a rebound ejector that protects the wind direction dial. The overall structure consists of a wind vane, a wind direction shaft and a wind direction dial. The magnetic rod and wind direction dial mounted on the wind direction dial form a magnetic compass to determine the wind direction. When the locking knob is pulled down and rotated to the right for positioning, the rebound ejector rod lowers the wind direction dial so that the tapered gem bearing contacts the shaft tip. At this time, the wind direction dial will automatically set 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 is rotated left and it rebounds upward to reset, the rebound ejector lifts up the wind direction dial and positions it on the upper part of the instrument, and separates the tapered gem bearing from the shaft tip to protect the wind direction dial and the bearings. The shaft tip is not damaged. (Note: This status must be restored promptly after use of the instrument)
2. Wind speed part
The wind speed sensor uses a traditional two-cup rotating frame structure. It converts the wind speed into the rotational speed of the rotating frame. In order to reduce the starting wind speed, a lightweight wind cup made of special materials and a jewel bearing support are used. After being detected by the sensor, the device fixed on the rotating frame transmits the signal to the host for measurement.
The microcontroller in the anemometer samples, corrects, and calculates the output signal of the wind sensor, and then the instrument outputs five parameters: instantaneous wind speed/one-minute average wind speed/instantaneous wind level/one-minute average wind level/wave height corresponding to the average wind level. . The measured parameters are directly displayed digitally on the LCD display of the instrument. In order to reduce the power consumption of the instrument, the sensors and microcontrollers in the instrument have taken a series of special measures to reduce power consumption. In order to ensure the reliability of the data, when the power supply voltage is too low, the battery mark at the bottom of the display shows lack of power, prompting the user that the power supply voltage is too low and the data is no longer reliable, and the battery needs to be replaced in time.
The working principle of the ultrasonic wind speed and direction meter is to use the ultrasonic time difference method to measure wind speed. The speed of sound propagating in the air will be superimposed with the speed of the airflow in the wind direction. If the ultrasonic wave propagates in the same direction as the wind, its speed will increase; conversely, if the ultrasonic wave propagates in the opposite direction to the wind, its speed will slow down. Therefore, under fixed detection conditions, the speed of ultrasonic waves propagating in the air can correspond to the wind speed function. The wind speed and direction can be obtained by calculation. Since the speed of sound waves is greatly affected by temperature when they propagate in the air; the anemometer detects two opposite directions on two channels, so the effect of temperature on the speed of sound waves is negligible.
