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Optical Engineering

Fourier imaging and distance approximation using time of flight method for terahertz wave imaging
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Paper Abstract

An active terahertz wave imaging method is investigated for improved system simplicity, inexpensive implementation, and distance approximation. The proposed technique is composed of a single-pixel setup that allows acquiring the two-dimensional (2-D) Fourier transform intensity map of the imaged object and additional depth data using time of flight method. A raster scan is performed to achieve the object’s 2-D Fourier transform intensity and depth information. Iterative phase retrieval methods are employed to accomplish good image reconstruction using only the measured object’s Fourier transform magnitude. The proposed method uses a glow discharge detector (GDD) as its single millimeter wave pixel and offers a simple noncalibrating scheme for 2-D imaging and distance approximation. This work shows experimental results of using the GDD as a distance approximation detector and specifies the advantages, disadvantages, and constraints when using such a sensor. Basic aperture imaging (transmission imaging) experimental results are also shown, and complex aperture imaging simulations and their corresponding reconstructions are presented. Finally, both 2-D imaging and acquired depth data are fused into a single three-dimensional reconstructed image to reveal the potential of the proposed method.

Paper Details

Date Published: 22 August 2014
PDF: 11 pages
Opt. Eng. 53(8) 083104 doi: 10.1117/1.OE.53.8.083104
Published in: Optical Engineering Volume 53, Issue 8
Show Author Affiliations
Amit Levi, Ben-Gurion Univ. of the Negev (Israel)
Ariel Univ. (Israel)
Natan S. Kopeika, Ben-Gurion Univ. of the Negev (Israel)
Amir Abramovich, Ariel Univ. (Israel)
Daniel Rozban, Ben-Gurion Univ. of the Negev (Israel)


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