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On the Impact of Subaperture Sampling for Multispectral Scalar Field Measurements

Advanced Flow Diagnostics Laboratory, Auburn University, Auburn, AL 36830, USA
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Optics 2020, 1(1), 136-154; https://doi.org/10.3390/opt1010010
Received: 29 February 2020 / Revised: 12 March 2020 / Accepted: 16 March 2020 / Published: 19 March 2020
(This article belongs to the Special Issue Optical Diagnostics in Engineering)
The novel 3D imaging and reconstruction capabilities of plenoptic cameras are extended for use with continuous scalar fields relevant to reacting flows. This work leverages the abundance of perspective views in a plenoptic camera with the insertion of multiple filters at the aperture plane. The aperture is divided into seven regions using off-the-shelf components, enabling the simultaneous capture of up to seven different user-selected spectra with minimal detriment to reconstruction quality. Since the accuracy of reconstructed features is known to scale with the available angular information, several filter configurations are proposed to maintain the maximum parallax. Three phantoms inspired by jet plumes are simulated onto an array of plenoptic cameras and reconstructed using ASART+TV with a variety of filter configurations. Some systematic challenges related to the non-uniform distribution of views are observed and discussed. Increasing the number of simultaneously acquired spectra is shown to incur a small detriment to the accuracy of reconstruction, but the overall loss in quality is significantly less than the gain in spectral information. View Full-Text
Keywords: volumetric; three-dimensional; multispectral; scalar field; plenoptic; light field volumetric; three-dimensional; multispectral; scalar field; plenoptic; light field
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Clifford, C.J.; Thurow, B.S. On the Impact of Subaperture Sampling for Multispectral Scalar Field Measurements. Optics 2020, 1, 136-154.

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