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Optical Engineering

Three-dimensional broadband terahertz synthetic aperture imaging
Author(s): Samuel C. Henry; Lisa M. Zurk; Scott Schecklman; Donald D. Duncan
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Paper Abstract

Terahertz (THz) technology holds great promise for applications such as explosives detection and nondestructive evaluation. In recent years, three-dimensional (3-D) THz imaging has been considered as a potential method to detect concealed explosives due to the transparent properties of packaging materials in the THz range. Another important advantage of THz systems is they measure the electric field directly. They are also phase coherent, supporting synthetic aperture (SA) imaging. In this paper, a near-field synthetic aperture THz imaging system is investigated for its potential use in detecting hidden objects. Frequency averaging techniques are used to reduce noise side-lobe artifacts, and improve depth resolution. System depth resolution is tested and characterized for performance. It will be shown that, depending on system bandwidth, depth resolution on the order of a few hundred microns can be achieved. A sample consisting of high-density polyethylene and three ball-bearings embedded inside is imaged at multiple depths. 3-D images of familiar objects are generated to demonstrate this capability.

Paper Details

Date Published: 22 May 2012
PDF: 10 pages
Opt. Eng. 51(9) 091603 doi: 10.1117/1.OE.51.9.091603
Published in: Optical Engineering Volume 51, Issue 9
Show Author Affiliations
Samuel C. Henry, Portland State Univ. (United States)
Lisa M. Zurk, Portland State Univ. (United States)
Scott Schecklman, Portland State Univ. (United States)
Donald D. Duncan, Portland State Univ. (United States)

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