Computer Science – Performance
Scientific paper
Mar 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011opten..50c3203g&link_type=abstract
Optical Engineering, Volume 50, Issue 3, pp. 033203-033203-9 (2011).
Computer Science
Performance
Band-Pass Filters, Fabry-Perot Interferometers, Gallium Arsenide, Iii-V Semiconductors, Image Sensors, Indium Compounds, Infrared Imaging, Microlenses, Mirrors, Optical Arrays, Optical Design Techniques, Optical Filters, Optical Multilayers, Filters, Zone Plates, And Polarizers, Imaging Detectors And Sensors, Optical System Design, Interferometers, Lenses, Prisms And Mirrors
Scientific paper
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.
Ashe Philip R.
Gupta Neelam
Tan Songsheng
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