An evaluation of the three-dimensional split-film anemometer for measurement of atmospheric turbulence

The Thermo-Systems, Inc., Model 1080D three-dimensional split-film anemometer system was evaluated for use in the measurement of atmospheric turbulence.

Calibration constants were obtained and the suggested method of data analysis was evaluated. Changes were made in the second approximation to the T.S.I.-suggested method. A method based on the computation of the sensor yaw angles, θ,from the sensor pitch angles e was developed and evaluated.

The methods of analysis were compared and it was found that the latter method was somewhat more accurate but that errors of ±10% are to be expected. Only when the probe is operated with zero angle of attack or when the mean velocity vector is parallel to the probe can a ±3% accuracy be expected using the θ-method (improved TSI method).