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Proceedings Paper

High-speed mid-infrared hyperspectral imaging using quantum cascade lasers
Author(s): David B. Kelley; Anish K. Goyal; Ninghui Zhu; Derek A. Wood; Travis R. Myers; Petros Kotidis; Cara Murphy; Chelsea Georgan; Gil Raz; Richard Maulini; Antoine Müller
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Paper Abstract

We report on a standoff chemical detection system using widely tunable external-cavity quantum cascade lasers (ECQCLs) to illuminate target surfaces in the mid infrared (λ = 7.4 – 10.5 μm). Hyperspectral images (hypercubes) are acquired by synchronously operating the EC-QCLs with a LN2-cooled HgCdTe camera. The use of rapidly tunable lasers and a high-frame-rate camera enables the capture of hypercubes with 128 x 128 pixels and >100 wavelengths in <0.1 s. Furthermore, raster scanning of the laser illumination allowed imaging of a 100-cm2 area at 5-m standoff. Raw hypercubes are post-processed to generate a hypercube that represents the surface reflectance relative to that of a diffuse reflectance standard. Results will be shown for liquids (e.g., silicone oil) and solid particles (e.g., caffeine, acetaminophen) on a variety of surfaces (e.g., aluminum, plastic, glass). Signature spectra are obtained for particulate loadings of RDX on glass of <1 μg/cm2.

Paper Details

Date Published: 3 May 2017
PDF: 10 pages
Proc. SPIE 10183, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XVIII, 1018304 (3 May 2017);
Show Author Affiliations
David B. Kelley, Block MEMS (United States)
Anish K. Goyal, Block MEMS (United States)
Ninghui Zhu, Block MEMS (United States)
Derek A. Wood, Block MEMS (United States)
Travis R. Myers, Block MEMS (United States)
Petros Kotidis, Block MEMS (United States)
Cara Murphy, Systems & Technology Research (United States)
Chelsea Georgan, Systems & Technology Research (United States)
Gil Raz, Systems & Technology Research (United States)
Richard Maulini, Alpes Lasers SA (Switzerland)
Antoine Müller, Alpes Lasers SA (Switzerland)

Published in SPIE Proceedings Vol. 10183:
Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XVIII
Augustus Way Fountain III; Jason A. Guicheteau, Editor(s)

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