2026-05-23T16:27:35Zhttps://keep.lib.asu.edu/oai/requestoai:keep.lib.asu.edu:node-1952872024-12-23T18:01:48Zoai_pmh:alloai_pmh:repo_items195287
https://hdl.handle.net/2286/R.2.N.195287
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All Rights Reserved
2024
50 pages
Masters Thesis
Academic theses
Text
eng
Obeso, Cecilio Alexander
Imani, Seyedmohammadreza F
Trichopoulos, Georgios
Jayasuriya, Suren
Arizona State University
Partial requirement for: M.S., Arizona State University, 2024
Field of study: Electrical Engineering
This work focuses on the development of a microwave imaging setup and postprocessing techniques for nondestructive evaluation of southwestern vegetation. A quasi-monostatic Inverse Synthetic Aperture Radar (ISAR) imaging system was constructed to perform a 2D scan of a prickly-pear cactus leaf, and software was developed to reconstruct an image of the leaf using data gathered by the imaging system. The ISAR system was built to operate in the C-band (6 GHz to 8 GHz), and the programming language used to develop the image reconstruction software was MATLAB. The purpose of the experiment performed in this thesis was to determine if theimaging system can be used to determine a target’s location within a region of interest,
track the change in moisture content within the cactus leaf, and detect changes in the
surface of the cactus leaf. To this end, a multitude of measurements were performed
over a 2D scanning area of a single cactus leaf over a month, with period lacerations
of varying orientations and lengths made to the surface of the target. The results of
this experiment indicate that the imaging system has a fine enough range resolution
to detect the location of the target within the scanned area of interest; a proper
examination of the cacti requires both x- and y-polarized probes, detecting changes
in moisture content is more complicated than anticipated, and that an imaging system
utilizing high frequencies should be investigated to detect more minor variations in
the target. Toward improving microwave imaging systems for NDE, I have included
the progress I have made towards developing software which utilizes the design of a 2D
dynamic metasurface antenna (DMA) for microwave imaging. This software allows
for assessing a DMA-based imaging system for different applications and setups.
Electrical Engineering
Cactus
ISAR
Microwave Imaging
NDE
Toward Microwave Cameras for Nondestructive Evaluation