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3D Microwave Imaging through Full Wa...

Duke University.

3D Microwave Imaging through Full Wave Methods for Heterogenous Media.

Record Type:	Electronic resources : Monograph/item
Title/Author:	3D Microwave Imaging through Full Wave Methods for Heterogenous Media.
Author:	Yuan, Mengqing.
Description:	125 p.
Notes:	Source: Dissertation Abstracts International, Volume: 72-07, Section: B, page: .
Notes:	Adviser: Qing H. Liu.
Contained By:	Dissertation Abstracts International72-07B.
Subject:	Physics, Electricity and Magnetism.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3453405
ISBN:	9781124614069

3D Microwave Imaging through Full Wave Methods for Heterogenous Media.
Yuan, Mengqing.

3D Microwave Imaging through Full Wave Methods for Heterogenous Media. - 125 p.

Source: Dissertation Abstracts International, Volume: 72-07, Section: B, page: .

Thesis (Ph.D.)--Duke University, 2011.

In this thesis, a 3D microwave imaging method is developed for a microwave imaging system with an arbitrary background medium. In the previous study on the breast cancer detection of our research group, a full wave inverse method, the Diagonal Tensor approximation combined with Born Iterative Method (DTA-BIM), was proposed to reconstruct the electrical profile of the inversion domain in a homogenous background medium and a layered background medium. In order to evaluate the performance of the DTA-BIM method in a realistic microwave imaging system, an experimental prototype of an active 3D microwave imaging system with scanning antennas is constructed. For the objects immersed in a homogenous background medium or a layered background medium, the inversion results based on the experimental data show that the resolution of the DTA-BIM method can reach finely to a quarter of wavelength of the background medium, and the system's signal-noise-ratio (SNR) requirement is 10 dB. However, the defects of this system make it difficult to be implemented in a realistic application. Thus, another active 3D microwave imaging system is proposed to overcome the problems of the previous system. The new system employs a fixed patch antenna array with electric switch to record the data. The antenna array introduces a non-canonical inhomogeneous background in the inversion system. The analytical Greens' functions employed in the original DTA-BIM method become unavailable. Thus, a modified DTA-BIM method, which use the numerical Green's functions combined with measured voltage, is proposed. This modified DTA-BIM method can be used to the inversion in a non-canonical inhomogeneous background with the measured voltages (or S 21 parameters). In order to verify the performance of this proposed inversion method, we investigate a prototype 3D microwave imaging system with a fixed antenna array. The inversion results from the synthetic data show that this method works well with a fixed antenna array, and the resolution of reconstructed images can reach to a quarter wavelength even in the presence of a strongly inhomogeneous background medium and antenna couplings. In addition, a time-reversal method is introduced as a pre-processing step to reduce the region of interest (ROI) in our inversion. Furthermore, a Multi-Domain DTA-BIM method is proposed to fit the discontinued inversion regions. With these improvements, the size of the inversion domain and the computational cost can be significantly reduced, making the DTA-BIM method more feasible for rapid response applications.

ISBN: 9781124614069Subjects--Topical Terms:

227483
Physics, Electricity and Magnetism.

3D Microwave Imaging through Full Wave Methods for Heterogenous Media.
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100 1 $a Yuan, Mengqing. $3 531043
245 1 0 $a 3D Microwave Imaging through Full Wave Methods for Heterogenous Media.
300 $a 125 p.
500 $a Source: Dissertation Abstracts International, Volume: 72-07, Section: B, page: .
500 $a Adviser: Qing H. Liu.
502 $a Thesis (Ph.D.)--Duke University, 2011.
520 $a In this thesis, a 3D microwave imaging method is developed for a microwave imaging system with an arbitrary background medium. In the previous study on the breast cancer detection of our research group, a full wave inverse method, the Diagonal Tensor approximation combined with Born Iterative Method (DTA-BIM), was proposed to reconstruct the electrical profile of the inversion domain in a homogenous background medium and a layered background medium. In order to evaluate the performance of the DTA-BIM method in a realistic microwave imaging system, an experimental prototype of an active 3D microwave imaging system with scanning antennas is constructed. For the objects immersed in a homogenous background medium or a layered background medium, the inversion results based on the experimental data show that the resolution of the DTA-BIM method can reach finely to a quarter of wavelength of the background medium, and the system's signal-noise-ratio (SNR) requirement is 10 dB. However, the defects of this system make it difficult to be implemented in a realistic application. Thus, another active 3D microwave imaging system is proposed to overcome the problems of the previous system. The new system employs a fixed patch antenna array with electric switch to record the data. The antenna array introduces a non-canonical inhomogeneous background in the inversion system. The analytical Greens' functions employed in the original DTA-BIM method become unavailable. Thus, a modified DTA-BIM method, which use the numerical Green's functions combined with measured voltage, is proposed. This modified DTA-BIM method can be used to the inversion in a non-canonical inhomogeneous background with the measured voltages (or S 21 parameters). In order to verify the performance of this proposed inversion method, we investigate a prototype 3D microwave imaging system with a fixed antenna array. The inversion results from the synthetic data show that this method works well with a fixed antenna array, and the resolution of reconstructed images can reach to a quarter wavelength even in the presence of a strongly inhomogeneous background medium and antenna couplings. In addition, a time-reversal method is introduced as a pre-processing step to reduce the region of interest (ROI) in our inversion. Furthermore, a Multi-Domain DTA-BIM method is proposed to fit the discontinued inversion regions. With these improvements, the size of the inversion domain and the computational cost can be significantly reduced, making the DTA-BIM method more feasible for rapid response applications.
590 $a School code: 0066.
650 4 $a Physics, Electricity and Magnetism. $3 227483
690 $a 0607
710 2 $a Duke University. $b Electrical and Computer Engineering. $3 531041
773 0 $t Dissertation Abstracts International $g 72-07B.
790 1 0 $a Liu, Qing H., $e advisor
790 1 0 $a George, Rhett $e committee member
790 1 0 $a Joines, William T. $e committee member
790 1 0 $a Brooke, Martin $e committee member
790 1 0 $a Stauffer, Paul $e committee member
790 1 0 $a Ybarra, Gary $e committee member
790 $a 0066
791 $a Ph.D.
792 $a 2011
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3453405