Anemometer Sensors Primarily Classified into Mechanical and Ultrasonic Types

Anemometer sensors are categorized into two main types based on their operating principles: mechanical and ultrasonic. Mechanical sensors feature structures such as wind cups or propellers, while ultrasonic sensors rely on the time-of-flight method for measurement. Different models are suited for various applications, including meteorological monitoring, drone operations, tunnel ventilation, and handheld field inspections.

Based on their operating principles, anemometer sensors can be broadly classified into two major categories: mechanical wind sensors and ultrasonic wind sensors. Mechanical wind sensors primarily consist of two structural types: wind-cup and propeller-based designs. Their operating principle involves the force of airflow driving the sensor to rotate; a central shaft then actuates internal sensing components to generate pulse signals. Within the sensor's specified measurement range, a distinct linear relationship exists between the wind speed and the frequency of these pulses. The advantages of mechanical wind sensors include simple construction, lower cost, and mature technology. However, due to the presence of mechanical rotating parts, they are susceptible to bearing wear issues after prolonged use and are subject to a specific "startup wind speed" threshold. Taking the FS485 model as an example: this sensor features a housing made of high-performance engineering polymer plastics; it offers a wind speed measurement range of 0–60 m/s with a resolution of 0.01 m/s, and a wind direction measurement range of 0–360 degrees with a resolution of 0.1 degrees. It has a startup wind speed of 0.5 m/s and outputs data via an RS485 interface.

Ultrasonic wind sensors perform measurements based on either the ultrasonic time-of-flight method or the Doppler effect principle. They calculate wind speed and direction by determining the time difference required for ultrasonic waves to travel between two specific points; this method effectively mitigates the influence of temperature fluctuations on the speed of sound. The key advantages of ultrasonic sensors include the absence of mechanical rotating parts—meaning no wear and tear, and thus maintenance-free operation—as well as the lack of a startup wind speed threshold. They are capable of detecting even subtle changes in airflow and provide comprehensive, 360-degree coverage for wind direction measurement. Regarding specific product models, the FT-SWF1 3D Ultrasonic Anemometer is capable of simultaneously measuring wind speeds across three dimensions. It features a hard-anodized aluminum alloy housing, offers a wind speed measurement range of 0–50 m/s with an accuracy of ±0.2 m/s, and is ideally suited for applications such as wind power generation and meteorological monitoring for roads and bridges. The FT-SQX1 Tunnel Wind Speed and Direction Detector is specifically designed for tunnel environments; featuring an IP68 protection rating and a Mean Time Between Failures (MTBF) exceeding 50,000 hours, it provides data essential for the design of tunnel ventilation systems.

To address the specific application requirements of drone platforms, specialized airborne anemometers have also been developed for the market. The FT-F1S Airborne Weather Station for drones can be mounted on drone platforms to enable real-time observation of wind speed and direction in complex terrain and hard-to-reach areas. The FT-F1H 3D Drone Wind Speed and Direction Sensor, utilizing the ultrasonic time-of-flight principle, features a compact structure with a measurement path of just 35 mm and weighs only 114 grams, making it particularly well-suited for integration into drone systems. Furthermore, handheld anemometers—such as the FT-SQ3 Three-Parameter Handheld Weather Station—integrate measurements of instantaneous wind speed, wind direction, and average wind speed into a single device. Equipped with a built-in electronic compass for 360-degree wind direction monitoring and a 3800mAh lithium battery capable of providing 18 hours of continuous operation, this device is widely utilized across fields such as meteorology, environmental protection, agriculture and forestry, and military operations.