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Proceedings Paper

Electromagnetic scattering calculations for terahertz sensing
Author(s): L. M. Zurk; B. Orlowski; G. Sundberg; D. P. Winebrenner; E. I. Thorsos; A. Chen
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Paper Abstract

This paper presents predictions of classical electromagnetic scattering from granular material illuminated by a terahertz (THz) source. Random media models are created to represent the explosive grains, air voids and filler material commonly found in explosive devices. These constituents can cause significant volume scattering that may alter or obscure the chemical response of the explosive, thus impacting THz detection of explosives. Furthermore, the air-explosive interface may have significant roughness, and scattering from this interface may be a dominant factor - particularly in reflection spectroscopy. The volume scattering is calculated using the Quasi-Crystalline Approximation (QCA) and a Finite Difference Time Domain (FDTD) calculation; the FDTD method is also used to estimate the rough surface scattering. Results from these calculations are provided for mixtures that are representative of common classes of explosives.

Paper Details

Date Published: 1 February 2007
PDF: 9 pages
Proc. SPIE 6472, Terahertz and Gigahertz Electronics and Photonics VI, 64720A (1 February 2007); doi: 10.1117/12.698720
Show Author Affiliations
L. M. Zurk, Portland State Univ. (United States)
B. Orlowski, Portland State Univ. (United States)
G. Sundberg, Portland State Univ. (United States)
D. P. Winebrenner, Univ. of Washington (United States)
E. I. Thorsos, Univ. of Washington (United States)
A. Chen, Univ. of Washington (United States)

Published in SPIE Proceedings Vol. 6472:
Terahertz and Gigahertz Electronics and Photonics VI
Kurt J. Linden; Laurence P. Sadwick, Editor(s)

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