A. Zh. Khachatrian, E. E. Elbakyan, A. F. Parsamyan, V. A. Khoetsyan
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On the Problem of Describing the Wave Field in the Near Zone
Expressions for the phase of a spherical wave in the near, middle, and far zones of observation are obtained. It is proved that in the Fresnel approximation a spherical wave is approximated by a paraboloid wave, which in its turn is approximated by a plane wave in the Fraunhofer approximation. Based on this, the problem of the description of a wave field generated by a system of many coherently radiating point sources is considered. An expression is obtained for the intensity distribution in the interference problem for the near-field approximation. It is shown that the distribution of intensity maxima is determined by solving a cubic equation, which, in the Fresnel approximation, transforms into a linear equation expressing the classical result on a uniform distribution of intensity maxima.
期刊介绍:
Journal of Contemporary Physics (Armenian Academy of Sciences) is a journal that covers all fields of modern physics. It publishes significant contributions in such areas of theoretical and applied science as interaction of elementary particles at superhigh energies, elementary particle physics, charged particle interactions with matter, physics of semiconductors and semiconductor devices, physics of condensed matter, radiophysics and radioelectronics, optics and quantum electronics, quantum size effects, nanophysics, sensorics, and superconductivity.