Acoustical dispersion in the ferrofluidical iterferometer

I. E. Dmitriev - V. M. Polunin

Kursk State Technical University, Kursk, 305040, Russia

Abstract
The velocity of sound waves in liquid contained in a tube can differ greatly from one in a free medium. Previous methods shown in literature before of experimental investigation of sound wave velocity dispersion in tubes have considerable lack. With the help of the constant base ferrofluidical interferometer based on the method of acoustic-magnetic indication of elastic oscillations the sufficient improvement in the experimental technique can be reached. The advantages of this method are the absence of a diffraction hindrance connected with a microphone and the absence of errors of a camera effective length measuring. With this technique the velocity dependence on frequency had been explored in the magnetic liquid contained in the glass cylindrical shells with various diameters and wall thickness over a range of frequencies 10-180 kHz. The experimental values obtained were compared with the theory by Lin and Morgan. Figs 2, refs 11.