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Title: Improving the spatial dynamic range of digital inline particle holography

Abstract

Digital in-line holography (DIH) has been proven to provide three-dimensional droplet position, size, and velocity distributions with a single-camera. This data is crucial for understanding multi-phase flows. In this work, we examine the performance of this diagnostic in the limit of very small particles, on the order of a pixel in diameter and smaller, and propose a post-processing method to improve them: Lanczos interpolation. The Lanczos interpolation kernel is the digital implementation of the Whittaker sinc filter, and strikes a compromise between maintaining the spatial frequency ceiling of the original digital image and computational cost of the interpolation. Without Lanczos interpolation, or super-sampling, the ultimate detectable particle size floor is on the order of 4 pixel widths. We show in this work that this limit can be reduced by 50% or more with super-sampling, depending upon the desired diameter accuracy, and examine the effect of super-sampling on the resulting accuracy of the extracted size and position of spherical particles. Extending this resolution limit increases the overall detection efficiency of the diagnostic. Since this increases the spatial dynamic range of the diagnostic, it can also allow a larger field-of-view to be captured with the same particle size floor.

Authors:
 [1]; ORCiD logo [2];  [2]
  1. Univ. of Edinburgh, Scotland (United Kingdom)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1485852
Alternate Identifier(s):
OSTI ID: 1484332
Report Number(s):
SAND-2018-13054J
Journal ID: ISSN 1559-128X; APOPAI; 669942
Grant/Contract Number:  
AC04-94AL85000; NA0003525
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Applied Optics
Additional Journal Information:
Journal Volume: 58; Journal Issue: 5; Journal ID: ISSN 1559-128X
Publisher:
Optical Society of America
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Falgout, Zachary, Chen, Yi, and Guildenbecher, Daniel R. Improving the spatial dynamic range of digital inline particle holography. United States: N. p., 2018. Web. doi:10.1364/AO.58.000A65.
Falgout, Zachary, Chen, Yi, & Guildenbecher, Daniel R. Improving the spatial dynamic range of digital inline particle holography. United States. doi:10.1364/AO.58.000A65.
Falgout, Zachary, Chen, Yi, and Guildenbecher, Daniel R. Wed . "Improving the spatial dynamic range of digital inline particle holography". United States. doi:10.1364/AO.58.000A65. https://www.osti.gov/servlets/purl/1485852.
@article{osti_1485852,
title = {Improving the spatial dynamic range of digital inline particle holography},
author = {Falgout, Zachary and Chen, Yi and Guildenbecher, Daniel R.},
abstractNote = {Digital in-line holography (DIH) has been proven to provide three-dimensional droplet position, size, and velocity distributions with a single-camera. This data is crucial for understanding multi-phase flows. In this work, we examine the performance of this diagnostic in the limit of very small particles, on the order of a pixel in diameter and smaller, and propose a post-processing method to improve them: Lanczos interpolation. The Lanczos interpolation kernel is the digital implementation of the Whittaker sinc filter, and strikes a compromise between maintaining the spatial frequency ceiling of the original digital image and computational cost of the interpolation. Without Lanczos interpolation, or super-sampling, the ultimate detectable particle size floor is on the order of 4 pixel widths. We show in this work that this limit can be reduced by 50% or more with super-sampling, depending upon the desired diameter accuracy, and examine the effect of super-sampling on the resulting accuracy of the extracted size and position of spherical particles. Extending this resolution limit increases the overall detection efficiency of the diagnostic. Since this increases the spatial dynamic range of the diagnostic, it can also allow a larger field-of-view to be captured with the same particle size floor.},
doi = {10.1364/AO.58.000A65},
journal = {Applied Optics},
issn = {1559-128X},
number = 5,
volume = 58,
place = {United States},
year = {2018},
month = {12}
}

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