Share Email Print
cover

Proceedings Paper

The challenge of changing signatures in infrared stand-off detection of trace explosives
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

We report our preliminary results on numerical modeling of IR back-scattering (reflectivity) and absorption (photothermal) IR signatures of micron-size (5-20 μm) particles. We use the Mie scattering theory which is an exact solution of the scattering problem for spherical particles of arbitrary size. In this paper, we approximate the particles as spheres with an equivalent volume. While we expect particle shape to influence IR spectra (albeit to a lesser extent), in this paper, we restrict ourselves to the effect of size (i.e. particle diameter) only. We also study the effect of air, solvent and other additive inclusions on the IR spectra. Finally, we address the effect of particle surface roughness. We show that all these parameters (size, inclusions, roughness) affect the scattering process which results in distortions to the IR spectra as compared to library values for bulk material. The effect of substrate on the IR spectra is not studied due to the limitations of the Mie scattering theory which was developed for isolated particles only. In addition to particle-related effects on IR spectra, the presence of substrate will have additional effects as well and this was studied previously by other research groups. We expect that the results of this study will help improve the performance of various detection algorithms by accounting for changing IR spectra.

Paper Details

Date Published: 29 May 2014
PDF: 11 pages
Proc. SPIE 9073, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XV, 90730M (29 May 2014); doi: 10.1117/12.2050621
Show Author Affiliations
Robert Furstenberg, U.S. Naval Research Lab. (United States)
Christopher A. Kendziora, U.S. Naval Research Lab. (United States)
Michael R. Papantonakis, U.S. Naval Research Lab. (United States)
Viet Nguyen, U.S. Naval Research Lab. (United States)
R. Andrew McGill, U.S. Naval Research Lab. (United States)


Published in SPIE Proceedings Vol. 9073:
Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XV
Augustus Way Fountain, Editor(s)

© SPIE. Terms of Use
Back to Top