A brief overview of non-destructive methods of obtaining information about the internal structure and phase composition of samples of geomaterials is given. Special attention is paid to optical-acoustic methods. Theoretical estimates of the spectra of optical-acoustic signal have been made. Necessary for studies of rock samples frequency range was defined. the estimates of necessary parameters of the excited longitudinal waves of ultrasonic pulses to determine the grain size and microcracks were made. The possibility of controlling the pulse parameters by choosing opto-acoustic generator material was shown. Generation of high-frequency part of the spectrum of the excited signal can be provided by the sharp rise of the leading edge exponentially with an exponent equal to the product of the absorption coefficient on the velocity of propagation of longitudinal waves in optical-acoustic transducer material.
The decline of this pulse determines the low-frequency part of the spectrum. The influence on the spectral characteristics of the diffraction and scattering at inhomogeneities geomedium was made. The spectra of the broadband acoustic signals to opto-acoustic generators made of different materials, with different laser pulse durations, as well as the diffraction and scatteringwere obtained. Features of the change of the spectra of scattering in dependence on the characteristic scales of grains (Rayleigh, stochastic and diffuse scattering). It has been shown that fixing the frequency corresponding to transitions from one area to another, it is possible to estimate the characteristic scale of scatterers: the maximum, minimum and average. Thus, by measuring the amplitude spectra of the source signal and transmitted through the sample, it is possible to determine the characteristic size of the grains.

The study has been supported by the Russian Science Foundation, Grant No. 161710181.


Internal structure, phase composition of samples; amplitude spectra of optical-acoustic signal; opto-acoustic generator; frequency dependence of scattering coefficient; characteristic scales of grains.

Issue number: 2
Year: 2017
UDK: 552.1
Authors: Ertuganova E. A., Vinnikov V. A., Shibaev I. A., Pavlov I. A.

About authors: Ertuganova E.A., Candidate of Technical Sciences, Assistant Professor, Vinnikov V.A., Doctor of Physical and Mathematical Sciences, Head of Chair, e-mail:, Shibaev I.A., Mining Engineer, Pavlov I.A.1, Student, Mining Institute, National University of Science and Technology «MISiS», 119049, Moscow, Russia.

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