University of Illinois Urbana-Champaign

Refocusing of Confocal Synthetic Optical Holographic Data

Buercklin, Samuel

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https://hdl.handle.net/2142/78983

Description

Title
Refocusing of Confocal Synthetic Optical Holographic Data
Author(s)
Buercklin, Samuel
Contributor(s)
Carney, Scott
Issue Date
2015-05
Keyword(s)
  • Holography
  • Synthetic Holography
  • Imaging
  • Refocusing
  • Confocal
  • Gaussian Beam
Abstract
In this thesis, a method for refocusing confocal synthetic optical holography data is described for the case where the object is far from the focal plane of the system. The forward problem is modeled in the context of a Gaussian beam for confocal microscopy in the backscattering geometry. A pseudoinverse for the forward operator is computed and used to reconstruct the original object, at which point the object is mathematically imaged with the new focal plane. Through the use of well-chosen approximations, a simple analytic solution is found amounting to rephasing in the Fourier domain. After developing the theory, results are demonstrated through the use of simulations in an ideal case with multiple simple scatterers in differing planes. Real data are processed, and refocusing is demonstrated with data taken from a high numerical aperture (NA) confocal system imaging a standard United States Air Force (USAF) target. Results show that by mathematically refocusing to a plane with an object, the refocused data more closely resembles that of the scattered field with the focus physically in the plane of the object.
Type of Resource
text
Language
en
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http://hdl.handle.net/2142/78983

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