Ultrasonic Anemometer

█ Introduction

Ultrasonic Anemometer’s work principle is by ultrasonic transit-time to measure the wind speed. Because it can overcome the inherent defects of mechanical anemometer, it can work in whole day, long time. it gets more and more widely used and is a powerful replacement of mechanical anemometer.

█ The principles of ultrasonic anemometer

Ultrasonic Anemometer’s work principle is by ultrasonic transit-time to measure the wind speed. The speed of sound in air speed will stack add speed of the air flow up. If the ultrasonic direction is same as the wind’s, it will speed up; Conversely, if the ultrasonic direction is contrary with the wind direction, it will be slower. Therefore, under the fixed test conditions, the ultrasonic speed in the air and the wind speed function is corresponded. It can be obtained the exact wind speed and direction by calculating. Because sound spread through the air, its speed greatly influenced by temperature. The Anemometer detects 2 channels on the two opposite directions, so the temperature impact on the speed of sound is negligible.

If necessary, users may select wind speed unit, the output frequency and output format, may also select the heating device (recommended in the cold environment) or analog output. It can connect with computers, data acquisition, or other RS485 or analog output consistent with the collection of equipment. If necessary, you can also form a network of multiple to use.

█ The example of pulse transmitting circuit
 

█  The applications of ultrasonic anemometer

Because the application of ultrasonic anemometer convenient, accurate, flexible and can be used in many fields, widely used in urban environmental monitoring, wind, weather monitoring, bridges, tunnels, marine vessels, airports, manufacturing all kinds of fans, exhaust ventilation required systems industries.