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Proceedings Paper

A 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 that operates in the short wavelength infrared region (SWIR) and has a number of applications. The system is low-weight, portable with a miniature platform and requires low power. The imager uses a 4×4 Fabry-Perot filter array operating from 1487 to 1769 nm with a spectral bandpass ~ 10 nm. The design of the filters is based on using a MEMS shadow mask technique to fabricate a Fabry-Perot etalon with multilayer dielectric mirrors. The filter array subsystem is installed in a commercial handheld InGaAs camera and the imaging lens of the camera is replaced by a custom designed 4×4 microlens array with telecentric imaging performance in each of the 16 sub-imaging channels. The imager was used to image a number of different indoor and outdoor scenes. The microlens optics and filter design is quite flexible and can be tailored for any wavelength region from UV to LWIR and the spectral bandpass can also be customized to meet the requirements. In this paper we will discuss the design and characterization of the filter array, the microlens optical package, and the imager and present imaging results obtained.

Paper Details

Date Published: 3 May 2010
PDF: 12 pages
Proc. SPIE 7660, Infrared Technology and Applications XXXVI, 76602G (3 May 2010);
Show Author Affiliations
Neelam Gupta, U.S. Army Research Lab. (United States)
Philip R. Ashe, Infotonics Technology Ctr. (United States)
Songsheng Tan, Infotonics Technology Ctr. (United States)

Published in SPIE Proceedings Vol. 7660:
Infrared Technology and Applications XXXVI
Bjørn F. Andresen; Gabor F. Fulop; Paul R. Norton, Editor(s)

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