Interferometer study of the turbulent flow by noise-signal sounding

Abstract

We consider the interferometer method by which a turbulent water flow is remotely studied by sounding with a noise ultrasound signal. It is shown that the processing of signals received by two spatially separated receivers makes it possible to extract the signal phase difference caused by the concentration fluctuations of cavity air bubbles on the propagation paths. Spectral analysis of the random phase difference permitted diagnostics of the propagation medium. In particular, it is shown that the output signal of the interferometer carries information on the spatial spectrum of parameter fluctuations of the medium, and on the velocity of inhomogeneities if the interferometer base is parallel to the turbulent flow.