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Optical Engineering • Open Access

Modeling and simulation of a spectro-polarimetric lenslet array imager
Author(s): Josh Walters; Brian M. Robinson; Patrick J. Reardon

Paper Abstract

A new, economical, lenslet-array-based imaging sensor design is proposed, simulated, and analyzed. In this investigation a bare lenslet array model is first developed in Code V®. The results show that, as expected, intolerable optical cross-talk is present in this simple system. This problem has been addressed in previous systems via the inclusion of a physical image separation layer. The alternative system proposed here to alleviate crosstalk involves the introduction of both polarizers and spectral filters. As a consequence this simple system design also provides spectro-polarimetric resolution. Simulations were developed in order to analyze the system performance of two designs. The simulation results were analyzed in terms of a measure of signal-to-noise ratio (SNR) and in terms of an en-squared energy that includes all subimages. The results show that a design employing only a few spectral filters suppresses crosstalk for objects of small angular extent but does not suppress crosstalk to a tolerable level for 2π steradian illumination, as evidenced by SNR less than one. However, the inclusion of more spectral filters results in a spectro-polarimetric thin imager design that suppresses crosstalk and provides finer spectral resolution without the inclusion of a signal separation layer.

Paper Details

Date Published: 1 February 2013
PDF: 10 pages
Opt. Eng. 52(2) 023201 doi: 10.1117/1.OE.52.2.023201
Published in: Optical Engineering Volume 52, Issue 2
Show Author Affiliations
Josh Walters, Torch Technologies (United States)
Brian M. Robinson, The Univ. of Alabama in Huntsville (United States)
Patrick J. Reardon, The Univ. of Alabama in Huntsville (United States)

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