Gurbatov S.N., Demin I.Yu., Pronchatov-Rubtsov N.V. «The use bispectral analysis for nonlinear diagnosis of soft tissues» High intensity acoustic waves in modern technological and medical applications. Joint Workshop of Russian Acoustical Society (RAS) and French Acoustical Society (SFA). Special Session of the XVI Meeting of Russian Acoustical Society (Moscow. 14–18 November 2005), с. 100-104 (2005)

The evolution of higher-order spectral functions of random waves propagating in a nonlinear medium are investigated. The possibility of recovering the input spectrum from the measured spectrum and bispectrum at the output of the nonlinear medium is discussed. A method of measurement of nonlinear propagation characteristics of low frequency vibration in the tissues by using bispectral analysis has been described.

Sebaa N., Fellah Z.E.A., Depollier C., Lauriks W. «Direct and inverse scattering problem in cancellous bone: application of biot theory» High intensity acoustic waves in modern technological and medical applications. Joint Workshop of Russian Acoustical Society (RAS) and French Acoustical Society (SFA). Special Session of the XVI Meeting of Russian Acoustical Society (Moscow. 14–18 November 2005), с. 92-99 (2005)

In this paper direct and inverse scattering problems of ultrasonic pulses from cancellous bone are investigated. Reflection and transmission coefficients are derived for a slab of cancellous bone having an elastic frame using Biot’s theory. The inverse problem for waves transmitted by cancellous bone is solved at normal incidence. Experimental results for slow and fast waves transmitted through cancellous bone samples are given and compared with theoretical predictions.

Didenkulov I.N., Kustov L.M., Pronchatov-Rubtsov N.V., Stromkov A.A. «Methods of the nonlinear acoustic vision of objects and defects» High intensity acoustic waves in modern technological and medical applications. Joint Workshop of Russian Acoustical Society (RAS) and French Acoustical Society (SFA). Special Session of the XVI Meeting of Russian Acoustical Society (Moscow. 14–18 November 2005), с. 128-134 (2005)

Nonlinear acoustic methods are found increasing applications during the last decade. In this paper we describe methods of acoustic imaging based on the nonlinear effects: the combination acoustic scattering and the modulation of high-frequency acoustic wave by low-frequency wave. Acoustic vision of objects at the difference frequency was studied using bubbles as strongly nonlinear scatterers. The experiments were carried out in a water tank with metal objects covered with electrolysis microbubbles to produce highly nonlinear scattering from the object surfaces. Images of the objects were obtained. The nonlinear scattering by bubbles was also used to obtain an image of the cavitation flow. Nonlinear acoustic vision of small (in the scale of wavelength) defects is possible when tomography schemes are applied. We used the method of nonlinear modulation modal spectroscopy for defectoscopy of cracks in metal samples. Results of investigation demonstrate possibilities of the nonlinear acoustic techniques in nondestructive testing of different media.

Kim Byoung-Nam, Lee Kang Il , Yoon Suk Wang , Choi Bok Kyung , Didenkulov I.N. «Nonlinear parameter estimation in water-saturated sandy sediment with difference frequency acoustic waves» Физическая акустика. Нелинейная акустика. Распространение и дифракция волн. Геоакустика. Сборник трудов 15 сессии Российского акустического общества. Т. 1, с. 172 (2004)

Goursolle T., Dos Santos S., Vander Meulen F., Haumesser L., Bou Matar O. «Ultrasonic parametric imaging of metallic samples using nonlinear acoustic measurements» High intensity acoustic waves in modern technological and medical applications. Joint Workshop of Russian Acoustical Society (RAS) and French Acoustical Society (SFA). Special Session of the XVI Meeting of Russian Acoustical Society (Moscow. 14–18 November 2005), с. 120-128 (2005)

A calibrated contact phase modulation method [Vila M., Vander Meulen F., Dos Santos S., Haumesser L. and Bou Matar O. Contact phase modulation method for acoustic nonlinear parameter measurement in solid // Ultrasonics 2004, V.42(1-9) P.1061–1065] have been developed in the laboratory. Nonlinear effects coming from parametric interaction of an high and a low frequency waves can be measured as a phase modulation of the HF acoustic beam. According to the NDE needs, the nonlinearity in samples with interfaces, coming from aeronautic industries (two layers of aluminum bonded by an epoxy thin layer), must be measured. In order to meet these needs, our method has been extended. Thanks to additional measurements of reflection coefficient, calibration procedure, based on the selfreciprocity principle applied to the LF transducer, has led us to obtain absolute value of the LF particle velocity at the bonded interface. To know the feasibility of this extension, preliminary results of nonlinear parameter have been obtained in bi-layer samples considering the propagation inside the layer only. An image has been created by slope values of phase modulation obtained from 25 regularly spaced measurements.

Haumesser L., Bou Matar O., Dos Santos S., Vander Meulen F. «Transmission through and reflection from a fluid elastic layer: quasi-linear approximation» High intensity acoustic waves in modern technological and medical applications. Joint Workshop of Russian Acoustical Society (RAS) and French Acoustical Society (SFA). Special Session of the XVI Meeting of Russian Acoustical Society (Moscow. 14–18 November 2005), с. 75-80 (2005)

Second Harmonic Generation (SHG) in a three fluid layer system, is investigated in the quasi-linear approximation. Considering an initially sinusoidal plane wave normally incident upon the central layer, the pressure radiated from the later is evaluated at double frequency. Analytical expressions for the reflected and transmitted pressure fields are derived from series of reflected and refracted waves. Results are discussed as a function of the geometrical and material characteristics of the system.

Воронович А.Г., Осташов В.Е., Colosi J.A., Cornuelle B.D., Dushaw B.D., Dzieciuch M.A., Howe B.M., Mercer J.A., Spindel R.C., Worcester P.F. «Исследование горизонтальной рефракции акустических сигналов по данным акустической лаборатории NPAL» Доклады 9 научной школы-семинара академика Л. М. Бреховских "Акустика океана", совмещенной с 12 сессией Российского акустического общества, с. 88 (2002)

Воронович А.Г., Осташов В.Е., Colosi J.A., Cornuelle B.D., Dushaw B.D., Dzieciuch M.A., Howe B.M., Mercer J.A., Spindel R.C., Worcester P.F. «Исследование горизонтальной рефракции акустических сигналов по данным акустической лаборатории NPAL» Доклады 9 научной школы-семинара академика Л. М. Бреховских "Акустика океана", совмещенной с 12 сессией Российского акустического общества, с. 88 (2002)