Golovanov E.V., Kashin V.V., Gorbachev I.A., Kolesov V.V., Zakharov A.V., Dol'nikov G.G. «Piezoelectric sensors for studying the Moon plasma-dust exosphere» Радиоэлектроника. Наносистемы. Информационные технологии, 16, № 7, с. 829-836 (2024)

The scientific research program of lunar landers includes an experiment involving the study of the dynamics of lunar microparticles and the parameters of the near-surface dust plasma. Near-surface plasma and levitating dust particles form the Moon plasma-dust exosphere. To register the mechanical characteristics of dust microparticles, it is necessary to develop an impact sensor. As a sensitive element for the impact sensor, the shock sensitivity of various piezoelectric materials was experimentally studied: lithium niobate single crystals, PZT-19 piezoceramics, as well as a piezopolymer film of polyvinylidene fluoride. To register electrical signals on the piezoelectric sensors surface, a measuring stand with the original topology of the electrode system on the plates has been developed. The sensitivity of various piezoelectric sensors to impact, the response times of the sensor to impact, as well as the coordinates of the impact points on the sensor plates were measured.

Pupyrev P.D., Nedospasov I.A., Kuznetsova I.E. «Acoustic effects on waveguide microstructures in silicon» Радиоэлектроника. Наносистемы. Информационные технологии, 16, № 7, с. 837-846 (2024)

Basic waveguide structures in anisotropic monocrystalline silicon medium are investigated for the existence of localized acoustic modes. The geometries of the structures were determined by technological methods and the practice of anisotropic etching, which guarantees reproducible high-quality structures in terms of geometric and crystallographic parameters. The acoustic effects were modeled by semi-analytical finite element method in the problems on eigenvalues and on the response to a harmonic traction source. Edge and surface localized modes were found. The spectral composition of the localized modes was interpreted on the basis of the surface acoustic wave slowness curves. Pseudomodes, highly localized leakage waves, were detected in a number of considered structures. The obtained results allow to evaluate promising geometrical configurations for further detailed study of the complete scope of dispersion properties of both single waveguides and their finite set.

Kuz'kin V.M., Pereselkov S.A., Tkachenko S.A., Pereselkov A.S., Grachev V.I. «Underwater noise source localization by a moving receiver based on holographic processing» Радиоэлектроника. Наносистемы. Информационные технологии, 16, № 7, с. 931-940 (2024)

The scenario of underwater situation mobile robotic monitoring by a single vector-scalar receiver placed on board a moving autonomous uninhabited underwater vehicle is presented. Underwater noise source detection and localization is based on holographic processing of sonar signals interferograms. An algorithm for restoring a moving underwater source parameters is described. The numerical simulation results are presented. The errors of restoring the source parameters are analyzed.