Ultrasonic anemometer core-ultrasonic transducer selection guide

Ultrasonic anemometer is a wind speed and wind direction measuring instrument developed based on the principle of ultrasonic waves. It achieves accurate measurement of wind speed and direction by measuring the time difference between sending and receiving. Its core component is the ultrasonic transducer.

Many customers don't know how to choose a suitable transducer when they first start developing ultrasonic wind speed and wind direction sensors.

First, without considering the circuit and software:
-For transducers with the same frequency, larger diameter means higher sensitivity.

- Under the same emission voltage, a larger diameter transducer receives a stronger signal.

When it is necessary to measure the maximum wind speed of 60 meters/second:
-If the circuit level is good, you can choose an ultrasonic transducer in the range of 180KHz to 225KHz.

- If the circuit level is average, you can choose an ultrasonic transducer in the range of 100KHz to 125KHz.

Secondly, if there is no volume requirement, try to choose a transducer with a larger diameter, such as 16mm or 14mm. Because the signal of a larger diameter transducer is relatively stronger, the circuit level requirements are lower.

Finally, if the sensor will be used in a seaside environment or an environment with salt spray or corrosive gases, it is best to choose a transducer made of PVDF to ensure corrosion resistance. At the same time, compared with the foam board emitting surface, the signal intensity of the PVDF emitting surface is higher.