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Spatial Heterodyne Imaging Using a Broadband Source

Zimnicki, James John
http://rave.ohiolink.edu/etdc/view?acc_num=dayton1519143422981263

Abstract Details

2018, Master of Science (M.S.), University of Dayton, Electro-Optics.
Imaging through obscurants is a critical issue for lidars looking through clouds, or human tissue. Traditionally Spatial heterodyne imaging has been performed with a low-bandwidth laser source that exhibits good coherence length characteristics. One of the drawbacks of using a low-bandwidth source with long coherence length is that signal return from all objects within the coherence length of the source mix equally well on the camera imaging the system. Broadening the bandwidth of the source shortens the coherence length of the system. This thesis intends to show that through careful system design, spatial heterodyne imaging can be performed in the presence of a broadband source, allowing significantly improved imaging in the presence of obscurants such as clouds or human tissue. The method used will be phase modulating the source with a pseudo-random bit sequence and matching the optical path lengths of the signal and local oscillator branches of the system. By matching the path lengths for a pseudo-random coded source we can image objects at specific distances related to the modulation speed and code length, while isolating the power of signal return from objects at other distances as a factor of the autocorrelation coefficient of the code.
Paul McManamon, Ph. D. (Advisor)
Edward Watson, Ph. D. (Committee Member)
Partha Banerjee, Ph. D. (Committee Member)
67 p.
Electrical Engineering; Engineering; Optics; Remote Sensing
Spatial Heterodyne Imaging; Digital Holography; Spatial Heterodyne; Lidar; Ladar; Pseudo-random bit sequence; pseudo-random code; pseudo random bit sequence; pseudo random code; PRBS; Phase Modulation; Laser Radar

Recommended Citations

Citations

  • Zimnicki, J. J. (2018). Spatial Heterodyne Imaging Using a Broadband Source [Master's thesis, University of Dayton]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1519143422981263

    APA Style (7th edition)

  • Zimnicki, James. Spatial Heterodyne Imaging Using a Broadband Source. 2018. University of Dayton, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=dayton1519143422981263.

    MLA Style (8th edition)

  • Zimnicki, James. "Spatial Heterodyne Imaging Using a Broadband Source." Master's thesis, University of Dayton, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1519143422981263

    Chicago Manual of Style (17th edition)

dayton1519143422981263
451
© 2018, all rights reserved.
This open access ETD is published by University of Dayton and OhioLINK.