info:eu-repo/semantics/report
Elaborating a new technique for acousto-optical spectrum analysis of ultra-high-frequency radio-wave signals with an improved resolution, using collinear wave heterodyning
Autor
ALEXANDER SHCHERBAKOV
DANIEL SANCHEZ LUCERO
ABRAHAM LUNA CASTELLANOS
KARLA JANETH SANCHEZ PEREZ
Resumen
This technical report is devoted to the problem of improving the frequency resolution inherent in a parallel acoustooptical
spectrum analysis via involving an additional nonlinear phenomenon into the data processing. In so doing, we
examine possible application of the wave heterodyning to the real-time scale acousto-optical analysis of the frequency
spectrum belonging to ultra-high-frequency radio-wave signals peculiar, for example, for radio-astronomy. The
nonlinear process of wave heterodyning is realized through providing a co-directional collinear interaction of the
longitudinal acoustic waves of finite amplitudes. This process, which is beforehand studied theoretically and
investigated experimentally via the acousto-optical technique as well, allows us either to improve the frequency
resolution of spectrum analysis at a given frequency range or to increase by a few times the current frequencies of
radio-wave signals under processing. The first step along this way is connected with experimental modeling of the
acoustic wave heterodyning in solids via exploitation of specific acousto-optical cell based on a liquid, which allows
the simplest realization of a cell with the needed properties. Then, these theoretical and practical findings are used in
our experimental studies aimed at creating a new type of acousto-optical cells, which are able to improve the resolution
inherent in acousto-optical spectrum analyzer operating over ultra-high-frequency radio-wave signals. In particular, the
possibility of upgrading the frequency resolution through the acoustic wave heterodyning is experimentally
demonstrated using the cell made of lead molybdate crystal. The obtained results demonstrate practical efficiency of
the novel approach presented. Thereafter, potentials peculiar to the acousto-optical spectrum analysis of a gigahertzfrequency
range radio-wave signals with essentially improved relative value of the frequency resolution, which can be
in the order of 10-5 in our case, is considered with exploiting a new type of the acousto-optical cell made of really
effective KRS - 5 cubic single crystal.