Using a Sodar to Measure Optical Turbulence and Wind Speed for the Thirty Meter Telescope Site Testing. Part II: Comparison with Independent Instruments |
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| Authors: | T Travouillon M Schöck S Els R Riddle W Skidmore |
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| Institution: | (1) Mechanical and Aerospace Engineering, Arizona State University, 85287-9809 Tempe, AZ, USA;(2) Department of Mechanical Engineering, University of California Riverside, Bourns Hall A315, 92521 Riverside, CA, USA;(3) Mechanical and Aerospace Engineering, Arizona State University, P.O. Box 876106, 85287-6106 Tempe, AZ, USA |
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| Abstract: | In the second part of this study, we compare both the wind speed and turbulence given by the Sodars with independent sets
of measurements. In the case of the wind speed we compare the lowest Sodar data bin with a sonic anemometer located on a 7-m
tower. The agreement between the two instruments was convincing with a regression slope near unity. The integrated turbulence
measurements of the Sodars are compared with those obtained with a combined multi-aperture scintillation sensor and differential
image motion monitor (MASS/DIMM) unit. It was found that the Sodars are indeed capable of quantitatively measuring optical
turbulence, and agree with the MASS/DIMM measurements with a correlation coefficient of approximately 80% and a regression
slope within 10% of unity. Additional acoustic noise in the Sodar data was identified using this comparison and removed from
the data. |
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