Digital anemometers face multiple technical challenges in measuring low wind speeds and turbulence. When measuring low wind speeds, traditional mechanical anemometers are prone to data distortion due to high start-up thresholds and mechanical friction, especially in the 0-5m/s range, where the inertia effect of the wind cup or impeller significantly reduces measurement accuracy. Turbulence measurement faces the problem of insufficient spatiotemporal resolution. Turbulent eddies have small scales and large velocity gradients, and traditional single point measurement instruments are difficult to capture transient changes. For example, in mountainous canyons, the wind speed may suddenly rise from 2m/s to 10m/s within 1 second, and the response time of mechanical anemometers for 1-2 seconds cannot be reflected in a timely manner, which can easily cause safety hazards.

For the challenge of low wind speed, dual sensor technology of thermal and hot wire can be used. Thermistors determine wind speed by measuring the energy required for airflow cooling, with a resolution of up to 0.01m/s, suitable for measuring gentle winds; The hot wire component utilizes high-frequency response characteristics to capture turbulent fluctuations, and the combination of the two can cover the full range of 0-5m/s. To reduce environmental interference, it is necessary to optimize probe design, such as using flexible probes to penetrate into corners of pipelines, or using orthogonal probe arrays to achieve three-dimensional monitoring, eliminating blind spots caused by the installation position of traditional instruments.

The breakthrough in turbulence measurement lies in improving dynamic response and spatial coverage. The ultrasonic anemometer synchronously monitors the X, Y, and Z wind speed components through three sets of orthogonal probes, with a response time of up to 50 milliseconds, and can track subtle changes in wind speed and direction in real time. Its design without mechanical rotating parts allows it to maintain stability in harsh environments such as sand and salt spray. For example, data from coastal wind farms shows that the instrument can operate continuously for 30 days during typhoon seasons, with a measurement accuracy 40% higher than traditional instruments. In addition, the combination of multi-point array layout and gate measurement method can expand the monitoring range and calculate the average value, further reducing the impact of turbulence on single point measurement.