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Proceedings Paper

A simultaneous dual-band infrared hyperspectral imager for standoff detection
Author(s): Neelam Gupta; Dale Smith
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Paper Abstract

A novel dual-band hyperspectral imager has been developed to collect 128-band hyperspectral image cubes simultaneously in both 4-5.25 μm (mid wave IR, MWIR) and 8-10.5 μm (long wave IR, LWIR) bands for both target detection and standoff detection of chemical and biological agents. The imager uses a specially designed diffractive optics Ge lens with a dual-band 320×240 HgCdTe infrared (IR) focal plane array (FPA) cooled with a closed cycle Sterling-cooler. The diffractive optics lens acts both as a focusing as well as a dispersive device. The imager simultaneously collects a single-color full scene image with a narrow band in the LWIR region (e.g., at 8 μm) using the first order diffraction and corresponding single-color image in the MWIR region (e.g., at 4 μm) using the second order diffraction. Images at different wavelengths are obtained by moving the lens along its optical axis to focus the corresponding wavelengths. Contributions of out of focus wavelengths are removed in post processing. In this paper we will briefly discuss the imager and present data and results from a recent field test.

Paper Details

Date Published: 8 November 2005
PDF: 10 pages
Proc. SPIE 5995, Chemical and Biological Standoff Detection III, 59950L (8 November 2005); doi: 10.1117/12.641235
Show Author Affiliations
Neelam Gupta, U.S. Army Research Lab. (United States)
Dale Smith, U.S. Army Research Lab. (United States)

Published in SPIE Proceedings Vol. 5995:
Chemical and Biological Standoff Detection III
James O. Jensen; Jean-Marc Thériault, Editor(s)

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