A.V. Kharlanov1

1 Volgograd State Technical University (Volgograd, Russia)

1 harlanov_av@mail.ru

One of the extensive fields of radiophysics research is the excitation of variable electromagnetic fields by accelerated moving charges. The whole surrounding world consists of such charges, and the study of the fields created by them is useful from the point of view of studying the behavior of various media, in particular, mechanical motion. One of the special cases of such motion is acoustic vibrations of various thin films. The simplest, both from the point of view of existence and from the point of view of study, is a charged spherical thin film. It can be either of artificial origin (for example, a soap film in the air or phospholipids placed in water and forming a spherical film due to interaction), or natural (membranes of living cells). Since the film has elastic properties, it can make mechanical vibrations accompanied by a change in its thickness. If different sides of an artificial film are charged with charges equal in modulus, but opposite in sign (cell membranes are charged by their nature), then such a system will create alternating electromagnetic fields in the surrounding space. Since in some cases (for example, with small film sizes) it is easier or preferable to measure electrical quantities than mechanical ones, it is possible to determine the mechanical parameters of both thin films themselves and their environment from the fields. And in biological systems, such fields can be used to diagnose the state of cells, as well as be channels of communication between cells and other living objects with each other. In this case, the spherical film will not have an ideal shape, its thickness will not be constant, and the charges on the inner and outer surfaces will not be equal in modulus. In the article, the generation of fields by a charged deformed thin film is considered, the effect of deformation on the field created by the film is determined. The fields created in space by a spherical film for the simplest deformations were found. It is shown that deformations, as well as excess charge on one of the film surfaces, add a constant component of the electric field strength. Moreover, the greater the distance and the higher the oscillation mode, the faster the variable component decreases compared to the constant. Thus, since the radiation of the film depends on the oscillation parameters, and, consequently, on the state of the film and the environment, it can be concluded that the fields created by the film can have an informational meaning, that is, to determine the parameters of the media. Also, such films can be used to convert signals by exciting acoustic vibrations with an external signal and then registering the fields generated by the film. The results of the article can be useful for diagnostic and medical purposes.

Kharlanov A.V. Fields created by a deformed charged thin film. Electromagnetic waves and electronic systems. 2023. V. 28. № 6. P. 5−12. DOI: https://doi.org/10.18127/j15604128-202306-01 (in Russian)

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