Anosov A., Granovsky N.V., Belyaev R.V., Erofeev A.V., Sanin A.G., Mansfeld A.D. «Correlation Measurements of Thermal Acoustic Radiation Using a Sensor Array» Acoustical Physics, 70, № 1, с. 21-28 (2024)

An array consisting of three sensors was used for correlation measurements of thermal acoustic radiation. For the first time, all cross-correlation functions were obtained for each pair of sensors. The measurements were carried out at two positions of the source (a heated narrow Teflon cylinder), the distance between which was equal to half the spatial period of the cross-correlation function of adjacent sensors. The measured correlation functions were in antiphase, which corresponds to the calculated correlation functions of thermal acoustic radiation. To pass from correlation functions to temperature distribution, spatial cross-correlation functions for adjacent and the outermost sensors in the array are summed. The correlation methodology makes it possible to significantly increase the spatial resolution of the method.

Mansfeld D., Belyaev R.V., Volkov G.P., Kuzmin A.A., Sanin A.G., Shaikin A.A. «Monitoring the Internal Temperature of Active Elements of High-Power Lasers Using Ultrasonic Probing» Acoustical Physics, 70, № 1, с. 68-75 (2024)

Monitoring the internal temperature of active elements (AE) of high-power lasers is necessary for their safe operation. The article describes a method and device for monitoring the internal temperature of the AE of lasers. The measurements utilize pulsed ultrasonic (US) probing and the temperature dependence of the sound speed in the AE material. A change in the sound speed leads to a change in the phase of the ultrasonic signal passing through the object, which is recorded by the described device. The results of monitoring the AE temperature using ultrasonic probing during operation of a laser device are presented.

Tsysar S.A., Rosnitskiy P.B., Asfandiyarov S.A., Petrosyan S.A., Khokhlova V.A., Sapozhnikov O.A. «Phase Correction of the Channels of a Fully Populated Randomized Multielement Therapeutic Array Using the Acoustic Holography Method» Acoustical Physics, 70, № 1, с. 82-89 (2024)

The acoustic holography method was used to characterize a therapeutic focused fully populated 256-element ultrasonic transducer array. Elements of the array with the shape of equal area polygons are densely arranged in an irregular pattern on a spherically concave surface with a radius of curvature of 150 mm and a diameter of 200 mm. The array has a central frequency of 1.2 MHz and is designed to operate in water. The performance of individual array elements was studied based on the holographically reconstructed normal velocity distribution over the array surface. It was shown that with the same electrical signals applied to the elements, their acoustic responses had a phase deviation relative to the nominal values, which can be caused either by the asphericity of the array surface, or by the introduction of additional phase delays by the electrical matching network. To compensate for the detected parasitic phase shifts of the elements and restore the effective sphericity of the radiating surface, the Verasonics V-1 control system was used. The hologram measured after making the correction, as well as the shape of the focal region and acoustic pressure magnitude at the focus, separately measured by a hydrophone, showed that the proposed method reconstructed the nominal operating parameters of the array with high accuracy.

Fraunie P., Aldebert C., Devenon J.L., Bourras D., Sentchev A., Shrira V. «3D investigation of the turbulent marine Ekman layer» 9-я Международная конференция – школа молодых ученых «Волны и вихри в сложных средах». Москва, 05–07 декабря 2018 г., с. 9-10 (2018)

Mansfeld D., Belyaev R.V., Volkov G.P., Kuzmin A.A., Sanin A.G., Shaikin A.A. «Monitoring the Internal Temperature of Active Elements of High-Power Lasers Using Ultrasonic Probing» Acoustical Physics, 70, № 1, с. 68-75 (2024)

Monitoring the internal temperature of active elements (AE) of high-power lasers is necessary for their safe operation. The article describes a method and device for monitoring the internal temperature of the AE of lasers. The measurements utilize pulsed ultrasonic (US) probing and the temperature dependence of the sound speed in the AE material. A change in the sound speed leads to a change in the phase of the ultrasonic signal passing through the object, which is recorded by the described device. The results of monitoring the AE temperature using ultrasonic probing during operation of a laser device are presented.

Fraunie P., Aldebert C., Devenon J.L., Bourras D., Sentchev A., Shrira V. «3D investigation of the turbulent marine Ekman layer» 9-я Международная конференция – школа молодых ученых «Волны и вихри в сложных средах». Москва, 05–07 декабря 2018 г., с. 9-10 (2018)

Chirkunov Yu.A., Skolubovich Yu.L. «Generalization the one-dimensional Leibenzon model of the motion of a liquid or gas in a porous medium in the presence of an unsteady singular source» Актуальные проблемы прикладной математики и механики. Тезисы докладов X Всероссийской конференции с международным участием, посвященной памяти академика А.Ф. Сидорова и 100-летию Уральского федерального университета. Абрау-Дюрсо, 01–06 сентября 2020 г., с. 4-5 (2020)

Subbotkin O. «Analysis of the Vibrational Process Inside an Acoustic Interference Array Using the Reverberation Matrix Method» Acoustical Physics, 70, № 1, с. 194-207 (2024)

The theoretical study of sound field formation in an acoustic interference array presented in this article is motivated by an analysis of the physical principle of operation of a highly directional interference microphone. One of the objectives of the study is to determine the sound pressure acting on the microphone membrane inside the array. The sound field inside the interference array is analyzed using a matrix method, similar to the reverberation matrix method. The solution is formally represented as a Schwarzschild series. The result calculated by this method agrees well with the experimental data.