Advantages of ultrasonic wind speed and direction meter

Among the many wind measuring instruments, wind cup anemometers have become more common in the history of their use because of their low cost and ease of use. But at the same time there are many problems, such as these mechanical devices due to moving parts, easy to wear and tear, the size of the need for frequent maintenance, and the instrument bracket and mounting bracket, etc. have a significant impact on the accuracy of the measurement. Its mechanical structure is also damaged by bad weather, mechanical for wind speed and wind direction instrument and starting wind speed, less than the starting value of the wind speed can not be pushed to drive the propeller or wind cup rotation, it can not be measured.

In the growing development of agricultural science today, ultrasonic wind speed anemometer also gradually into the public eye. It is a solid-state design, is the use of ultrasonic propagation speed by the role of the wind in the air and wind speed measurement, make up for certain shortcomings of the mechanical wind anemometer, there is no mechanical wear and tear, obstacles, freezing, etc., the same will not appear "mechanical inertia", from the theory that is the ability to measure the wind speed range of the lower limit of the value of zero, there is no The lower limit of the wind speed range is zero in theory, and there is no starting wind speed is not big enough; the upper limit of the wind speed can be adjusted with the spacing of the sensor.

Ultrasonic propagation speed in the air changes with the wind and air flow direction. If the wind direction and the ultrasonic propagation direction are the same, it will increase the propagation speed of the sound wave, and vice versa will decrease the speed of the sound wave. Fixed measurement path under different wind speed, wind direction superposition of the formation of sound wave propagation speed will cause the sound wave propagation time difference. Therefore, wind speed can be measured by wind speed and wind volume on the ultrasonic pulse in a fixed path in two directions of the transport time difference.