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LABORATORY OF ULTRASONICS

 

 

 

The laboratory is one of the world's leading centers in the area of experimental and theoretical study of generation and propagation of phase conjugate ultrasonic beams. Fundamental problems are being investigated as well as applications in non-destructive evaluation (NDE) and medicine. The laboratory has intensive collaboration and joint research projects with the Department of Cybernetics at Moscow Institute of Radioengineering, Electronics and Automation (Moscow), Department of Mechanical Engineering at the University of Texas at Austin (Austin, Texas, USA), Laboratory of Ultrasonics at Ecole Centrale de Lille (Lille, France)

Staff

  • L. M. Krutyansky, Ph.D.
  • V. L. Preobrazhensky, D.Sc.
  • A. D. Stakhovsky, Ph.D.·
  • V.N. Strel'tsov, D.Sc.

    • The laboratory is headed by A. P. Brysev, Ph.D.


    PRINCIPAL FIELDS OF RESEARCH

  • Physical mechanisms of parametric phase conjugation (PC) of ultrasound;
  • Study of conjugate beams in the conditions of supercritical phonon-magnon interaction in magnetostrictive ceramics under alternating pumping by an external magnetic field;
  • Propagation of ultrasonic phase conjugate beams within homogeneous and inhomogeneous media including nonlinear propagation;·
  • Applications of ultrasonic PC to acoustic imaging, NDE, and medicine.


    • BASIC EQUIPMENT

  • A custom-made supercritical parametric PC-amplifier of ultrasound based on magnetostrictive ceramics with the gain over 100 dB;
  • A computerized system for measurements of ultrasonic fields with a wideband membrane PVDF hydrophone;· Original software for processing of obtained data.


    • MOST IMPORTANT RESULTS

  • Development of a parametric PC- amplifier with giant amplification of sound based on magnetostrictive ceramics;·
  • Realization of self-targeting of ultrasonic beams onto stationary and moving scattering objects by means of PC;·
  • Application of PC for effective focusing of high intensity nonlinear ultrasonic beams in a medium with phase inhomogeneities;
  • · Development of a new acoustic imaging system utilizing PC and nonlinear propagation effects.

    •  

    a b c


    PC for acoustic imaging in inhomogeneous medium

    (a) An acoustic image of microcircuit structure using a conventional “transmission” mode in conditions of non-aberration propagation medium; (b)the same as in (a) but in the presence of aberrations; (c) the same as in (b) but using PC.

    		  
     

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