METHOD OF OBTAINING RADIO HOLOGRAMS OF SUBSURFACE CYLINDRICALLY SHAPED CONDUCTING OBJECTS Russian patent published in 2015 - IPC G01V3/12 

FIELD: radio engineering, communication.

SUBSTANCE: method includes stepwise variation of a signal in a given frequency range with a uniform step from $$f_{\min }=k_{\min }\frac{c}{D}$$ to $$f_{\max }=k_{\max }\frac{c}{D}$$ , where k_min=0.72. k_max=0.81, D is antenna diameter and c is the speed of light. The number of separate frequencies in the range from f_min to f_max is not less than five. The analysed portion of a surface is scanned. The radio hologram of the analysed portion is recorded and the orientation of the conducting subsurface cylinder is determined. The antenna is first oriented relative to the axis of the subsurface cylinder such that the electric field vector is situated perpendicular to the axis of the cylinder, and the surface is scanned with perpendicular polarisation. The antenna is then oriented relative to the axis of the cylinder such that the electric field vector is situated parallel to the axis of the subsurface cylinder, and the surface is scanned with parallel polarisation. The radio hologram of the cylinder is recorded with perpendicular and parallel polarisation. The focal depth of images of the subsurface cylinder with perpendicular and parallel polarisations is determined; the radius r of the subsurface cylinder and the depth of burial h are found using the expressions: r=l_⊥-l_||; h=l_⊥, where l_⊥ is the focal depth of images of the subsurface cylinder with perpendicular polarisation, l_|| is the focal depth of images of the subsurface cylinder with parallel polarisation.

EFFECT: indirect determination of the diameter of fittings and other conducting cylindrically shaped objects in condensed media.

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