Comparison of three-dimensional particle tracking and sizing using plenoptic imaging and digital in-line holography

Journal Article · 08 August 2016 · Applied Optics

DOI: https://doi.org/10.1364/AO.55.006410 · OSTI ID:1338312

Hall, Elise M. ^[1]; Thurow, Brian S. ^[1]; Guildenbecher, Daniel R. ^[2]

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1. Auburn Univ., Auburn, AL (United States)
2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Digital in-line holography (DIH) and plenoptic photography are two techniques for single-shot, volumetric measurement of 3D particle fields. Here we present a comparison of the two methods by applying plenoptic imaging to experimental configurations that have been previously investigated with DIH. These experiments include the tracking of secondary droplets from the impact of a water drop on a thin film of water and tracking of pellets from a shotgun. Both plenoptic imaging and DIH successfully quantify the 3D nature of these particle fields. Furthermore, this includes measurement of the 3D particle position, individual particle sizes, and three-component velocity vectors. For the initial processing methods presented here, both techniques give out-of-plane positional accuracy of approximately 1–2 particle diameters. For a fixed image sensor, digital holography achieves higher effective in-plane spatial resolutions. However, collimated and coherent illumination makes holography susceptible to image distortion through index of refraction gradients, as demonstrated in the shotgun experiments. In contrast, plenoptic imaging allows for a simpler experimental configuration and, due to the use of diffuse, white-light illumination, plenoptic imaging is less susceptible to image distortion in the shotgun experiments.

• Research Organization: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: AC04-94AL85000
• OSTI ID: 1338312
• Alternate ID(s): OSTI ID: 1283409
• Report Number(s): SAND-2016-6911J; APOPAI; 645882; TRN: US1701737
• Journal Information: Applied Optics, Vol. 55, Issue 23; ISSN 0003-6935
• Publisher: Optical Society of America (OSA)Copyright Statement
• Country of Publication: United States
• Language: English