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Optical Engineering • new

Snapshot imaging spectrometry with a heterodyned Savart plate interferometer
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Paper Abstract

Imaging spectrometers are frequently used in remote sensing for their increased target discrimination capabilities over conventional imaging. Increasing the spectral resolution of these sensors further enables the system’s ability to discriminate certain targets and adds the potential for monitoring narrow-line spectral features. We describe a high spectral resolution ( Δ λ = 1.1    nm full-width at half maximum) snapshot imaging spectrometer capable of distinguishing two narrowly separated bands in the red-visible spectrum. A theoretical model is provided to detail the first polarization grating-based spatial heterodyning of a Savart plate interferometer. Following this discussion, the experimental conditions of the narrow-line imaging spectrometer (NLIS) are provided. Finally, calibration and target identification methods are applied and quantified. Ultimately it is demonstrated that in a full spectral acquisition the NLIS sensor is capable of less than 3.5% error in reconstruction. Additionally, it is demonstrated that neural networks provide greater than 99% reduction in crosstalk when compared to pseudoinversion and expectation maximization in single target identification.

Paper Details

Date Published: 7 June 2017
PDF: 11 pages
Opt. Eng. 56(8) 081806 doi: 10.1117/1.OE.56.8.081806
Published in: Optical Engineering Volume 56, Issue 8
Show Author Affiliations
Bryan Maione, North Carolina State Univ. (United States)
Optical Sensing Lab. (United States)
Leandra Brickson, North Carolina State Univ. (United States)
Geometric-Phase Photonics Lab. (United States)
Michael Escuti, North Carolina State Univ. (United States)
Geometric-Phase Photonics Lab. (United States)
Michael Kudenov, North Carolina State Univ. (United States)
Optical Sensing Lab. (United States)


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