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Ultrasonic wind speed and direction sensor


Date:(2018-5-12)   Clicks:3069

People can hear the sound of the frequency of 20Hz ~ 2KHz, which is the audible sound wave, the sound beyond this frequency range, the sound below 20Hz is called low frequency sound wave, the sound above 20KHz is called Ultrasound, the general speaking frequency The range is 10Hz-8KHz. The ultrasonic wave has good directionality and strong penetrating ability, and it is easy to obtain more concentrated sound energy. The distance traveled in water is far away, and the ultrasonic wave is named because its lower limit of frequency is equal to the upper limit of human hearing.

The wind sensor is composed of four ultrasonic transducers distributed on the same level and evenly distributed along the circumference. They form an array of transducers. The wind speed and wind direction were calculated by measuring the forward and reverse transmission time of ultrasonic waves in the east-west and north-south directions.The specific schematic diagram is as follows. First, a probe is used as a transmitting probe, and 2 probes are used as a receiving probe. When a measurement is performed, a time is obtained. Then, 2 probes are used as the transmitting probes, and 1 probe is used as a receiving probe to obtain another time in the opposite direction.Set the south and north (or east-west) distance of the two ultrasonic transceivers to bed, the downwind transmission time to t12, the upwind transmission time to t21, the wind speed to Vw, and the ultrasonic propagation speed to Vs.

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The method can accurately measure the speed of wind and even the speed of ultrasonic waves, and can measure the wind speed and direction in a single direction. Simultaneously, the wind speed and wind direction in the east-west and north-south directions can be measured, and the two-dimensional wind speed and wind direction can be calculated.

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