Introduction to Wind Direction and Anemometer for Measuring Instantaneous Wind Speed and Direction
Wind direction and anemometer are used to measure instantaneous wind speed and direction, with automatic display function. It mainly consists of a support rod, 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, and the wind speed is calculated based on the speed of the wind cup. So it is also called a wind cup anemometer.
test method
This method tests the resistance change generated by the sensor cooling due to wind when it is in an energized state, thereby testing the wind speed. Unable to obtain information on wind direction. In addition to being easy to carry and convenient, it has a high cost performance ratio and is widely adopted as a standard product for anemometers. Thermal anemometers use platinum wires, thermocouples, and semiconductors, but our company uses platinum coil wires. The material of platinum wire is physically stable. Therefore, it has advantages in long-term stability and temperature compensation.
Working Principle 1
1. Wind direction
The wind direction is supported by a rebound top rod that protects the wind direction dial. The overall structure consists of a wind vane, wind direction axis, and wind direction dial. The magnetic rod installed on the wind direction dial and the wind direction dial form a magnetic compass to determine the direction of the wind direction. When the locking knob is pulled down and rotated to the right for positioning, the rebound top rod lowers the wind direction dial, causing the conical gem bearing to come into contact with 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 turning the lock knob to the left and causing it to rebound upwards and reset, the rebound ejector rod will lift the wind direction dial and position it on the upper part of the instrument, and separate the conical gemstone bearing from the shaft tip to protect the wind direction dial and the bearing from damage to the shaft tip. (Note: After the instrument is used, it must be promptly replied to this status)
2. Wind speed section
The wind speed sensor adopts 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, special materials such as lightweight wind cups and gemstone bearings are used for support. The signal is transmitted to the host for calculation after being detected by sensors through a device fixed on the rotating frame.
The microcontroller inside the anemometer samples, corrects, and calculates the output signal of the wind sensor, and then the instrument outputs 5 parameters corresponding to the instantaneous wind speed/one minute average wind speed/instantaneous wind level/one minute average wind level/average wind level. The measured parameters are directly displayed in numbers on the instrument's LCD display. In order to reduce the power consumption of the instrument, a series of specialized measures have been taken to reduce the power consumption of sensors and microcontrollers in the instrument. In order to ensure the reliability of data, when the power supply voltage is too low, the battery mark on the lower part of the display shows a lack of power, indicating that the user's power supply voltage is too low and the data is no longer reliable. It is necessary to replace the battery in a timely manner.
Working Principle II
The working principle of an ultrasonic anemometer is to use the ultrasonic time difference method to measure wind speed. The propagation speed of sound in the air will be superimposed with the airflow speed in the wind direction. If the direction of ultrasonic propagation is the same as the direction of wind, its speed will accelerate; On the contrary, if the propagation direction of ultrasound is opposite to the wind direction, its speed will slow down. Therefore, under fixed detection conditions, the speed of ultrasonic propagation in the air can correspond to the function of wind speed. The wind speed and direction can be obtained through calculation. When sound waves propagate in the air, their speed is greatly influenced by temperature; The anemometer detects two opposite directions on two channels, so the effect of temperature on the velocity of sound waves can be ignored.
Users can choose wind speed units, output frequency, and output format as needed. You can also choose heating devices (recommended for use in cold environments) or analog outputs as needed. It can be used in conjunction with computers, data collectors, or other collection devices with RS485 or analog output compatibility. If necessary, multiple machines can also be formed into a network for use
