Special Section on Imaging Spectrometry

Snapshot imaging spectrometry with a heterodyned Savart plate interferometer

[+] Author Affiliations
Bryan Maione, Michael Kudenov

North Carolina State University, Department of Electrical and Computer Engineering, Raleigh, North Carolina, United States

Optical Sensing Lab, Raleigh, North Carolina, United States

Leandra Brickson, Michael Escuti

North Carolina State University, Department of Electrical and Computer Engineering, Raleigh, North Carolina, United States

Geometric-Phase Photonics Lab, Raleigh, North Carolina, United States

Opt. Eng. 56(8), 081806 (Jun 07, 2017). doi:10.1117/1.OE.56.8.081806
History: Received December 5, 2016; Accepted May 15, 2017
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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.

© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Bryan Maione ; Leandra Brickson ; Michael Escuti and Michael Kudenov
"Snapshot imaging spectrometry with a heterodyned Savart plate interferometer", Opt. Eng. 56(8), 081806 (Jun 07, 2017). ; http://dx.doi.org/10.1117/1.OE.56.8.081806


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