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Optimum Optical Design for Conventional and Computational Scanner Systems

Javaherian, Farhang | 2018

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 51262 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Rashidian, Bizhan
  7. Abstract:
  8. An inconsistency between the circular symmetric geometry of conventional optical imagers and the geometry of long linear sensors used in today line scan cameras, results in suboptimal separate design of optics and electronics of scanner systems. In this thesis two new imaging methods namely Foveated scanning (FS) and Linear Fovea (LF) are proposed to tackle this problem and to design lenses that are better matched to linear sensors. Both techniques are based on the known Foveated Imaging (FI) scheme and are employed to enlarge the one dimensional resolved field of view (RFOV) of conventional lenses and to permit prioritized performance on a Line-of-Interest (LOI) in the image plane where the opto-electronic sensor is located. The FS method, consisting a spatial light modulator that consecutively scans fovea locations on the LOI, is verified on a proof-of-concept basic telephoto lens. A 2-fold increase in RFOV is reported by this technique. In the LF method, employing a single doubly symmetric surface and thereby belonging to the free-form optics subfield, the RFOV as the merit function, is maximized, by finding appropriate Zernike coefficients describing that surface. Applying on a Newtonian like single mirror telescope, the RFOV has been doubled once more. As a by-product of this research, a technique named Spectral Scanning (SS) is proposed to counteract the illumination restrictions of FI systems and to allow implementing a multi-chromatic area scan FI system
  9. Keywords:
  10. Aberration Coefficient ; Foveated Scanning (FS) ; Linear Fovea (LF) ; Spectral Scanning Foveated Imaging ; Free Form Optics ; Foveated Imaging

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