Charnotskii M. I., I. M. Fuks, K. A. Naugolnykh, A. V. Smirnov, D. Di Iorio and I. B. Esipov (March 2006): An experimental test of the dual-frequency method for monitoring transverse currents. Acoust. Phys., 52 (2), 222-226. doi:10.1134/S1063771006020175

Abstract

The dual-frequency method for monitoring the transverse component of the velocity of current is tested using the data obtained earlier in a tidally forced flow through a channel. The turbulent properties of the flow cause fluctuations in the acoustic signals propagating through it. The fluctuations of such signals emitted at two different frequencies are coherent in the low-frequency band and noncoherent in the high-frequency region of the spectrum. The frequency separating these spectral regions is determined as the cutoff frequency of the coherence function and is directly related to the component of the current in the direction perpendicular to that of signal propagation. The results of measuring this component of the current are consistent with the data obtained with other independent methods and measurements.