Snapshot imaging spectrometry with a heterodyned Savart plate interferometer

Bryan Maione; Leandra Brickson; Michael Escuti; Michael Kudenov

doi:10.1117/1.OE.56.8.081806

7 June 2017 Snapshot imaging spectrometry with a heterodyned Savart plate interferometer

Bryan Maione, Leandra Brickson, Michael Escuti, Michael Kudenov

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Optical Engineering, Vol. 56, Issue 8, 081806 (June 2017). https://doi.org/10.1117/1.OE.56.8.081806

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 (Δλ=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.

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Bryan Maione, Leandra Brickson, Michael Escuti, and Michael Kudenov "Snapshot imaging spectrometry with a heterodyned Savart plate interferometer," Optical Engineering 56(8), 081806 (7 June 2017). https://doi.org/10.1117/1.OE.56.8.081806

Received: 5 December 2016; Accepted: 15 May 2017; Published: 7 June 2017

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