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Mid-infrared reflection signatures for trace chemicals on surfaces
Author(s): Derek Wood; David B. Kelley; Anish K. Goyal; Petros Kotidis
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Paper Abstract

Results are presented for the detection of trace explosive residues on real-world surfaces using active mid-infrared (MIR) hyperspectral imaging. The target surface is illuminated using miniature, rapidly tunable, external-cavity quantum cascade lasers (EC-QCLs) and the reflected light is imaged using a HgCdTe camera with a spatial resolution of 70 μm. Hypercubes with 128x128 pixels are captured with more than 256 wavelengths that span 7.7 – 11.8 μm. The samples consisted of PETN residues which were applied to keyboard keys at various levels of chemical loading. We estimate a limit of detection of less than 6 ng per pixel for the as-deposited chemical. The explosive residue remains detectable by HSI even after wiping the surface several times using isopropyl alcohol. Simple signature models for solid particles (i.e., Mie scattering) and thin-films account for the many of the spectral features observed in the chemical signatures.

Paper Details

Date Published: 16 May 2018
PDF: 6 pages
Proc. SPIE 10629, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIX, 1062915 (16 May 2018); doi: 10.1117/12.2304453
Show Author Affiliations
Derek Wood, Block MEMS (United States)
David B. Kelley, Block MEMS (United States)
Anish K. Goyal, Block MEMS (United States)
Petros Kotidis, Block MEMS (United States)

Published in SPIE Proceedings Vol. 10629:
Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIX
Jason A. Guicheteau; Augustus Way Fountain; Chris R. Howle, Editor(s)

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