Monitoring and its working principle of ultrasonic wind speed transducer

Views: 4 Author: Site Editor Publish Time: 2020-04-22 Origin: Site

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Ultrasonic wind speed transducer and wind direction are one of the important meteorological elements. Especially in the construction of navigation and emergency vehicle-mounted automatic weather stations, mobile wind speed and wind direction measurement systems are required. In addition, environmental detection, industrial air duct detection and hazardous gas measurement are required. Industrial production and scientific research have extensive application needs for mobile wind measuring instruments. The wind speed and direction monitors commonly used in weather monitoring including arrow-type wind direction transmitters, three-cup type wind speed transmitters, and ultrasonic wind speed and wind direction transmitters.

The rotor-type wind direction transmitter and the three-cup type wind speed transmitter both adopt a mechanical structure design, and there are rotating parts. Before the monitoring, a low wind speed is required to start. If the wind speed transducer is lower than the starting value, the propeller or the wind cup will not be able to rotate and monitoring; and because of the presence of moving parts, it is prone to wear and damage by severe weather. At the same time, due to the existence of friction, the mechanical wind speed and direction indicator also has a starting wind speed. Wind speeds transducer is lower than the starting value will not drive the propeller or the wind cup to rotate. Therefore, for the breeze is lower than the starting wind speed, the mechanical anemometer will not be able to measure. In order to overcome the inherent shortcomings of the traditional wind cup wind speed and direction indicator, a new type of ultrasonic wind speed and direction indicator came into being. Ultrasonic wind speed anemometer is a measuring sensor or measuring instrument that calculates wind speed and wind direction by sending sound pulses and measuring the time or frequency (doppler transform) difference at the receiving end.

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Working principle of ultrasonic wind speed sensor and direction sensor
The working principle of the ultrasonic wind speed sensor is to use the ultrasound that time difference method to achieve the measurement of wind speed and direction. Due to the speed of sound propagation in the air, it will be superimposed on the velocity of the airflow upward. If the propagation direction of the ultrasonic wave is the same as the wind direction, then its speed will be accelerated; conversely, if the propagation direction of the ultrasonic wind speed sensor is opposite to the wind direction, then its speed will become slower. Therefore, under the fixed detection conditions, the speed of ultrasonic wave propagation in the air can be correspond to wind speed function. The exact wind speed and direction can be obtained through calculation. Since the sound wave propagates in the air, its speed is greatly affected by the 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.

Transducer for ultrasonic wind sensor has the characteristics of light weight, no moving parts, ruggedness, and does not require maintenance and on-site calibration. It can output wind speed and direction at the same time. Customers can choose the wind speed unit, output frequency and output format according to their needs. You can also choose a heating device (recommended for use in an icy environment) or an analog output according to your needs. It can be used in conjunction with computers, data collectors or other acquisition devices with RS485 or analog output. If necessary, multiple units can also be used as a network.

Ultrasonic wind speed transducer and direction indicator is a more advanced instrument for measuring wind speed and direction. Because it overcomes the inherent defects of the mechanical wind speed and direction indicator, it can work normally all day and long, and it is more and more widely used. It will be a powerful alternative to mechanical anemometers.

Features of ultrasonic wind speed sensor:
Compared with the traditional mechanical wind speed and direction transmitter, the ultrasonic wind speed and direction transmitter has the following four advantages: one no inertial measurement, no start wind speed limit zero wind speed work, 360 ° all-round no angle limit, can obtain wind speed at the same time .And wind direction value; 2. It adopts an integrated structure design with no moving parts as a whole, and the shell is made of engineering plastic material, which has low wear and long service life; 3. It adopts random error identification technology, which can also ensure low discrete error of measurement under high winds, so that the output is more stable; Fourth, the device does not require on-site calibration and maintenance. Ultrasonic wind speed and direction transmitters are equipped with four ultrasonic probes pointing down on the top of the device. They can send and receive ultrasonic waves in a two-dimensional plane. The time difference of ultrasonic waves are propagating in the air is calculated by the built-in microprocessor .Measuring the value of wind speed and wind direction, upload the data to the monitoring center or cloud platform through the concentrator in 4G / GPRS communication mode for users to view.

Wide range of applications:
Meteorology, ocean, environment, airport, port, laboratory, industry, agriculture and transportation.
With the rapid development of the Internet of things, the ultrasonic wind speed and direction sensor can overcome the inherent defects of the mechanical wind speed and direction indicator, so it can work normally all day and long, and is more and more widely used. In the future, it will be a powerful alternative to mechanical anemometers.