Physics
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgre..108.5029c&link_type=abstract
Journal of Geophysical Research (Planets), Volume 108, Issue E4, pp. 10-1, CiteID 5029, DOI 10.1029/2002JE001944
Physics
Planetary Sciences: Instruments And Techniques, Planetology: Fluid Planets: Instruments And Techniques, Planetary Sciences: Atmospheres-Structure And Dynamics, Planetology: Fluid Planets: Atmospheres-Structure And Dynamics
Scientific paper
The application of a recently developed model of sonic anemometers measuring process has revealed that these sensors cannot be considered as absolute ones when measuring spectral characteristics of turbulent wind speed since it is demonstrated that the ratios of measured to real spectral density functions depend on the composition and temperature of the considered planetary atmosphere. The new model of the measuring process of sonic anemometers is applied to describe the measuring characteristics of these sensors as fluid/flow dependent (against the traditional hypothesis of fluid/flow independence) and hence dependent on the considered planetary atmosphere. The influence of fluid and flow characteristics (quantified via the Mach number of the flow) and the influence of the design parameters of sonic anemometers (mainly represented by time delay between pulses shots and geometry) on turbulence measurement are quantified for the atmospheres of Mars, Jupiter, and Earth. Important differences between the behavior of these sensors for the same averaged wind speed in the three considered atmospheres are detected in terms of characteristics of turbulence measurement as well as in terms of optimum values of anemometer design parameters for application on the different considered planetary atmospheres. These differences cannot be detected by traditional models of sonic anemometer measuring process based on line averaging along the sonic acoustic paths.
Cuerva Alvaro
Sanz-Andrés Angel
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