7/30/2023 0 Comments Wind vane and anemometer![]() ![]() The transit time is the fundamental element that allows the measurement of both wind speed and direction. In conditions of heavy rainfall and strong wind, the presence of water drops moving between the sonic transmitters and receivers can alter the transit time of the ultrasonic wave.These turbulences increase as the wind speed increases and it is for this reason that at high speeds the general accuracy of the sonic sensor can deteriorates significantly. These phenomena are difficult to correct with the adjustment performed within wind tunnels during the calibration process, as the wind in nature has a much bigger turbulent behavior, with a larger variable origin angle in terms of amplitude and frequency, compared to the air flow generated inside a wind tunnel, which tends to be laminar. Sonic wind sensors with a top sonic sound reflecting plate, due to their geometry, have generally worse accuracy, especially at high wind speeds, when turbulence phenomena occur between the two sides of the measuring chamber. When it comes to total measurement accuracy, however, it is important to make a distinction.Sonic wind sensors are particularly suitable to assess the intensity and duration of wind gusts, as they have virtually no delay distance, hence an ability to respond rapidly to sudden wind speed changes.This is due to their better specification in terms of measurement threshold compared to cups and vane wind sensors. Sonic wind sensors are particularly recommended in situations where extremely low wind speeds, less than 0.2 m/s, need to be assessed.Sonic wind sensors are potentially better then cups and vane types due to their measurement principle however, it is important to take some factors into consideration: The quality of the measurement is a crucial factor in choosing a wind sensor. Submersible sensors for the water level.Water conductivity, temperature and level. ![]()
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