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Analysis of coughed droplets using stereoscopic high-speed imaging

Roth, Adrian LU ; Stiti, Mehdi LU ; Matamis, Alexios LU orcid ; Frantz, David LU ; Richter, Mattias LU ; Aldén, Marcus LU and Berrocal, Edouard LU (2021)
Abstract
Droplets generated by talking and coughing play a major role in the spreading of COVID-19. Thus, there is a need for accurate measurements of the physical properties of exhaled droplets just at the exit of the mouth, including their number and velocity. Several challenges are associated with imaging coughed droplets. First, large variation of droplet size will translate to a large range of signal intensity when detected. Second, high droplet speed near the mouth requires both, short exposure time to freeze droplet motion and kHz recording rate to resolve their displacement. Finally, as a highly non-symmetrical spray system is formed from a cough, three-dimensional visualization is necessary to faithfully capture coughing events. Here, a... (More)
Droplets generated by talking and coughing play a major role in the spreading of COVID-19. Thus, there is a need for accurate measurements of the physical properties of exhaled droplets just at the exit of the mouth, including their number and velocity. Several challenges are associated with imaging coughed droplets. First, large variation of droplet size will translate to a large range of signal intensity when detected. Second, high droplet speed near the mouth requires both, short exposure time to freeze droplet motion and kHz recording rate to resolve their displacement. Finally, as a highly non-symmetrical spray system is formed from a cough, three-dimensional visualization is necessary to faithfully capture coughing events. Here, a 3D, high-speed imaging technique is presented that facilitates such challenging measurements. A laser beam with a rectangular cross-section (15 mm thick – 120 mm high) is formed and illuminates the imaged droplets exiting the mouth of a coughing person. The 3D droplet speed has been extracted over several coughs in order to draw statistical results where the maximum speed for a single cough has been estimated to vary between 12 and 36 m/s.
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Please use this url to cite or link to this publication:
author
; ; ; ; ; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
ICLASS 2021, 15 th Triennial International Conference on Liquid Atomization and Spray Systems, Edinburgh, UK, 29 Aug. - 2 Sept. 2021
pages
8 pages
DOI
10.2218/iclass.2021.6022
language
English
LU publication?
yes
id
06d2ceb3-d4ea-495b-9e2e-23ff9c6ca8f2
date added to LUP
2023-08-03 14:32:01
date last changed
2023-08-25 14:17:45
@inproceedings{06d2ceb3-d4ea-495b-9e2e-23ff9c6ca8f2,
  abstract     = {{Droplets generated by talking and coughing play a major role in the spreading of COVID-19. Thus, there is a need for accurate measurements of the physical properties of exhaled droplets just at the exit of the mouth, including their number and velocity. Several challenges are associated with imaging coughed droplets. First, large variation of droplet size will translate to a large range of signal intensity when detected. Second, high droplet speed near the mouth requires both, short exposure time to freeze droplet motion and kHz recording rate to resolve their displacement. Finally, as a highly non-symmetrical spray system is formed from a cough, three-dimensional visualization is necessary to faithfully capture coughing events. Here, a 3D, high-speed imaging technique is presented that facilitates such challenging measurements. A laser beam with a rectangular cross-section (15 mm thick – 120 mm high) is formed and illuminates the imaged droplets exiting the mouth of a coughing person. The 3D droplet speed has been extracted over several coughs in order to draw statistical results where the maximum speed for a single cough has been estimated to vary between 12 and 36 m/s.<br/>}},
  author       = {{Roth, Adrian and Stiti, Mehdi and Matamis, Alexios and Frantz, David and Richter, Mattias and Aldén, Marcus and Berrocal, Edouard}},
  booktitle    = {{ICLASS 2021, 15 th Triennial International Conference on Liquid Atomization and Spray Systems, Edinburgh, UK, 29 Aug. - 2 Sept. 2021}},
  language     = {{eng}},
  month        = {{08}},
  title        = {{Analysis of coughed droplets using stereoscopic high-speed imaging}},
  url          = {{https://lup.lub.lu.se/search/files/153992071/iclass_2021_coughvid.pdf}},
  doi          = {{10.2218/iclass.2021.6022}},
  year         = {{2021}},
}