Computer Science
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008spie.7094e...3t&link_type=abstract
Unconventional Imaging IV. Edited by Dolne, Jean J.; Karr, Thomas J.; Gamiz, Victor L. Proceedings of the SPIE, Volume 7094,
Computer Science
Scientific paper
We have developed a computer simulation to demonstrate the use of a periodic grating structure in the near field of a telescope to super-resolve objects in the far field. The separation between the telescope pupil and the grating provides a periodic anisoplanatism for the telescope, modulating the measured brightness of a point source as it moves across the field normal to the grating. The resulting periodic modulation of an extended source can thus produce a spatial frequency heterodyning effect, where frequency components outside the diffraction passband are aliased inside the passband and measured. Using the simulation, we have quantitatively validated the analytically-predicted periodic blur function for the case of single near-field grating. Further, we have shown the heterodyning effect is observed when the distance between the grating and pupil corresponds to the Talbot distance, where the grating forms a "self-image" in the plane of the pupil.
Barrett Eamon B.
Tyler David W.
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