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Optical Engineering

Miniature snapshot multispectral imager
Author(s): Neelam Gupta; Philip R. Ashe; Songsheng Tan
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Paper Abstract

We present a miniature snapshot multispectral imager based on using a monolithic filter array that operates in the short wavelength infrared spectral region and has a number of defense and commercial applications. The system is low-weight, portable with a miniature platform, and requires low power. The imager uses a 4×4 Fabry-Pérot filter array operating from 1487 to 1769 nm with a spectral bandpass ∼10 nm. The design of the filters is based on using a shadow mask technique to fabricate an array of Fabry-Pérot etalons with two multilayer dielectric mirrors. The filter array is installed in a commercial handheld InGaAs camera, replacing the imaging lens with a custom designed 4×4 microlens assembly with telecentric imaging performance in each of the 16 subimaging channels. We imaged several indoor and outdoor scenes. The microlens assembly and filter design is quite flexible and can be tailored for any wavelength region from the ultraviolet to the longwave infrared, and the spectral bandpass can also be customized to meet sensing requirements. In this paper we discuss the design and characterization of the filter array, the microlens optical assembly, and imager and present imaging results.

Paper Details

Date Published: 1 March 2011
PDF: 10 pages
Opt. Eng. 50(3) 033203 doi: 10.1117/1.3552665
Published in: Optical Engineering Volume 50, Issue 3
Show Author Affiliations
Neelam Gupta, U.S. Army Research Lab. (United States)
Philip R. Ashe, Smart System Technology & Commercialization Ctr. (United States)
Songsheng Tan, Smart System Technology & Commercialization Ctr. (United States)

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