Spectral Transfer Functions for a Three-Component Sonic Anemometer

Abstract

The transfer functions which describe the effect of line averaging and path separation on the response of a three-component sonic anemometer have been computed specifically for the Kaijo-Denki PAT 311. These computations differ from the previous work of Kaimal et al., by accounting for the two parallel paths which compose each measurement axis and for the vertical separation of the two horizontal axes. There is only a minor additional attenuation of response for the vertical wind component due to the measurement axis being composed of two paths rather than one. However, the differences between the horizontal transfer functions calculated here and those presented by Kaimal et al. are significant and could be important for correcting sonic spectra in the inertial subrange.