The BAO tower seen from the UTD 200S

Fig.1: Carrier-to-Noise Ratio (CNR) for the measurements performed to detect the locations of the sonic anemometers over the BAO met-tower.

In Fig. 1 the CNR of the tests carried out for the detection of the sonic anemometers over the BAO met-tower is reported. It is evident that, due to the small size of the sonics and booms compared to the height of the tower, it was not an easy task. Therefore, full credits to Armita, Mithu and Aditya, who performed those measurements!

We performed several tests in order to characterize the repeatability of the experiments, and an accuracy of 0.01 deg is observed by performing scans in the same direction and starting from a reference location, in order to minimize backlash. However, a general precision of 0.05 deg is found for general scans. 

In Fig. 2, the CNR for the boom at 50 m height is reported, which allows to perceive even the geometry of the sonic anemometers!

Fig. 2: CNR of the tests carried out in proximity of the boom at 50 m height.

Fig. 3: Sonic anemometer CSAT3 by Campbell Scientific.