A Fast Terahertz Imaging Method Using Sparse Rotating Array

For fast and standoff personal screening, a novel terahertz imaging scheme using a sparse rotating array is developed in this paper. A linearly sparse array is designed to move along a circular path with respect to an axis perpendicular to the imaging scenario. For this new scheme, a modified imagin...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Vol. 17; no. 10; p. 2209
Main Authors: Jiang, Yanwen, Deng, Bin, Qin, Yuliang, Wang, Hongqiang, Liu, Kang
Format: Journal Article
Language:English
Published: Switzerland MDPI AG 26.09.2017
MDPI
Subjects:
Algorithms
Antennas
Geometry
Metal detectors
Optimization
Simulation
sparse array optimization
spectral support
synthetic aperture radar
terahertz imaging
terahertz imaging
spectral support
synthetic aperture radar
sparse array optimization
ISSN:1424-8220, 1424-8220
Online Access:Get full text
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Summary:For fast and standoff personal screening, a novel terahertz imaging scheme using a sparse rotating array is developed in this paper. A linearly sparse array is designed to move along a circular path with respect to an axis perpendicular to the imaging scenario. For this new scheme, a modified imaging algorithm is proposed based on the frequency-domain reconstruction method in circular synthetic aperture radar. To achieve better imaging performance, an optimization method of the sparse array is also proposed, according to the distribution of the spectral support. Theoretical and numerical analysis of the point spread function (PSF) is provided to demonstrate the high-resolution imaging ability of the proposed scheme. Comprehensive simulations are carried out to validate the feasibility and effectiveness of the array optimization method. Finally, the imaging results of a human-scattering model are also obtained to further demonstrate the good performance of this new imaging scheme and the effectiveness of the array optimization approach. This work can facilitate the design and practice of terahertz imaging systems for security inspection.
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ISSN:1424-8220
1424-8220
DOI:10.3390/s17102209