A networked two-dimensional sonic anemometer system for the measurement of air velocity in greenhouses

The experimental study of air movement induced by natural ventilation in greenhouses requires a system to measure the air velocity field. A networked, two-dimensional sonic anemometer system was developed for simultaneous measurement of the instantaneous air speed and direction at 12 locations. The system performance was tested and validated against a mass flow controller and a commercial, three-dimensional, ultrasonic anemometer. The sonic anemometer system was then tested in greenhouse conditions. It showed that the high resolution, stability, proper frequency response and low cost of the system were well adapted for the study of the air velocity field in greenhouses.