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https://hdl.handle.net/2142/81370
Description
Title
Four-Dimensional Coherence Sensing
Author(s)
Marks, Daniel Lawrence
Issue Date
2001
Doctoral Committee Chair(s)
David Jones Brady
Department of Study
Electrical Engineering
Discipline
Electrical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Electronics and Electrical
Language
eng
Abstract
Ubiquitous computational capacity and large electronic focal plane arrays have made new combinations of optical sensing and digital processing possible. Using the framework of optical spatial coherence theory, this thesis proposes and investigates new combinations of optics and algorithms with capabilities not possessed by standard lens-based cameras. This thesis proposes and demonstrates how cone-beam tomographic algorithms can be used to make high-resolution 3-D power density reconstructions of visible light sources using standard lens-based cameras, pinhole cameras, cubic-phase-plate enhanced high depth-of-field imagers, and coherence sensors such as the Rotational Shearing Interferometer. The thesis also demonstrates how the Rotational Shearing Interferometer can obtain infinite depth-of-field images, which is not possible with lens-based cameras. A new coherence sensor is proposed, the Astigmatic Coherence Sensor, that measures the entire spatial coherence function in an aperture, without the noise and stability disadvantages of an interferometric sensor. With the entire coherence function, a coherence mode decomposition can be used to separate the fields due to independent sources. Using the ACS, the coherence of a distorted source is measured, and the distortion is identified and removed. Finally, the Optical Golomb Ruler Sampling Interferometer is proposed, a design that uses spot array generation to combinatorically correlate all pairs of a set of points in an aperture.
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