3 May 2010 A miniature snapshot multispectral imager
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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.
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Neelam Gupta, Philip R. Ashe, Songsheng Tan, "A miniature snapshot multispectral imager", Proc. SPIE 7660, Infrared Technology and Applications XXXVI, 76602G (3 May 2010); doi: 10.1117/12.852661; https://doi.org/10.1117/12.852661
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