Abstract
The use of periodgrams as a tool to study heterodyne signals is evaluated. The heterodyne signal carries information about density fluctuations from light scattered by a turbulent jet. The goal of the analysis is to be able to separate the information about density fluctuations of acoustics origin (peaked at about 2 MHz) from fluctuations in the density due to entropy irregularities (wide peak centered at the origin). There are frequency regions where both overlap. Various methods are compared: Bartlett, Welch, Yule–Walker, Burg and others. (To be presented in Spanish.)
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