24 September 2009 Image reconstruction with sub-diffraction resolution in radio vision devices of millimeter and terahertz range using receiving arrays and image scanning
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Abstract
The method of image reconstruction with sub-diffraction resolution in radio vision devices (RVD) of shortwave millimeter and terahertz frequency range is proposed. The method is based on image scanning using two-dimensional receiving element array of RVD when array and image move circularly in common plane relatively each to other (rotating or not rotating) with small eccentricity between their centers. The results of scanning are signals reading out by detectors of array receiving elements. Each signal is proportional to the integral of two functions product. One function is a perfect image field distribution of the observed object received by RVD without diffraction distortion. Another one is RVD optical (quasioptical) transfer function comprising beams delivering incident radiation to detectors of array. The second function takes into account whole received radiation beam paths from RVD input to each detector including the effect of diffraction and reciprocal circular scanning of array and image. The image of observed object itself can be found solving inverse ill-posed problem determined by mentioned above integral relations. The estimation using computer simulation has shown that proposed method permits to increase resolution up to ten times in comparison with the case of diffraction restriction. The method is aimed at radioastronomy telescopes and RVD's for the security, medical diagnostics and other systems.
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Alexander N. Vystavkin, Alexander N. Vystavkin, Andrey V. Pestryakov, Andrey V. Pestryakov, Sergey E. Bankov, Sergey E. Bankov, Vladimir M. Chebotarev, Vladimir M. Chebotarev, } "Image reconstruction with sub-diffraction resolution in radio vision devices of millimeter and terahertz range using receiving arrays and image scanning", Proc. SPIE 7485, Millimetre Wave and Terahertz Sensors and Technology II, 74850O (24 September 2009); doi: 10.1117/12.830929; https://doi.org/10.1117/12.830929
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