How to choose mechanical and ultrasonic wind speed and direction sensors?
In the natural environment, wind speed and direction are important meteorological factors in environmental monitoring. Wind always affects our lives. In modern society, with the advancement of technology, it is used to monitor the direction and magnitude of wind speed. Wind direction sensors have been widely used in meteorology. Currently, there are two types of equipment for monitoring wind speed and wind direction: one is wind speed and wind direction sensors with mechanical structure, and the other is wind speed and direction sensors with ultrasonic measurement; these two types of sensors are common in daily life. What are the similarities and differences between the two devices, whether there are accuracy problems, how to choose, let me explain in detail below:First of all, let’s talk about the mechanical wind speed and direction sensor. The wind speed and direction sensor is not integrated, divided into wind speed sensor and wind direction sensor: Wind speed sensor The mechanical structure of the wind speed sensor is a kind of wind speed and air volume that can be continuously measured (air volume u003d wind speed × cross-sectional area ) The size of the sensor. The more common wind speed sensor is the wind cup type wind speed sensor. According to legend, the sensor was first invented by Robinson in the UK. The measuring part is composed of three or four hemispherical wind cups. The wind cups are installed on a rotating support vertical to the ground at equal angles along one direction. Wind direction sensor The wind direction sensor detects and senses the wind direction information from the outside by the rotation of the wind direction arrow, and transmits it to the coaxial encoder, and at the same time outputs a physical device corresponding to the wind direction related value; its main body adopts The mechanical structure of the wind vane, when the wind blows to the tail of the wind vane, the arrow of the wind vane will point to the direction of the wind. In order to maintain sensitivity to the direction, different internal mechanisms are also used to identify the direction for the wind speed sensor. Ultrasonic wind speed and direction sensor The working principle of ultrasonic is to use the ultrasonic time difference method to measure wind speed and direction. Due to the propagation speed of sound in the air, it will be superimposed with the airflow speed in the wind direction. If the propagation direction of the ultrasonic wave is the same as the wind direction, then its speed will increase; conversely, if the propagation direction of the ultrasonic wave is opposite to the wind direction, then its speed will slow down. Therefore, under fixed detection conditions, the speed of ultrasonic propagation in the air can correspond to the wind speed function. The precise wind speed and direction can be obtained by calculation. As the sound wave propagates in the air, its speed is greatly affected by temperature; the wind speed sensor detects two opposite directions on the two channels, so the effect of temperature on the sound wave speed is negligible. To sum up, because the wind direction sensor and wind speed sensor are designed with mechanical structure and have rotating parts, the minimum wind speed before monitoring is the starting condition. If the wind speed is lower than the starting value, the propeller or wind cannot be driven. The cup rotates, so it cannot be monitored. The opposite is the ultrasonic wind speed and direction sensor. The biggest feature of this device is: no start-up wind speed, even under zero wind speed conditions, it can work, and it needs two devices different from the mechanical wind speed and direction. Two monitoring methods are integrated, simultaneously detecting and simultaneously outputting. With the rapid development of the Internet of Things, there is an increasing demand for the accuracy of monitoring meteorological elements. The use of ultrasonic wind speed and direction sensors can well overcome the inherent shortcomings of mechanical wind speed and direction, so it can be used all-weather and long-term Normal work, if the cost can be reduced in the future, it will be a powerful substitute for mechanical anemometers.
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