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Interpretation of Backlit Droplet Images from ISS Droplet Combustion Experiments

Fei Yu

Fei Yu

Computer Science Department, University of California - DavisDavis, CA, United States
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Yu, Fei
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Benjamin D. Shaw

Benjamin D. Shaw

Mechanical and Aerospace Engineering Department, University of California - DavisDavis, CA, United States
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Shaw, Benjamin D.
  
18. Jan. 2022
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Artikel-Kategorie: Research Article
Online veröffentlicht: 18. Jan. 2022
Seitenbereich: 82 - 93
DOI: https://doi.org/10.2478/gsr-2014-0007
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© 2014 Fei Yu et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Figure 1.

(a) Representative backlit droplet image; and (b) grayscale profile across the droplet and through the droplet center.
(a) Representative backlit droplet image; and (b) grayscale profile across the droplet and through the droplet center.

Figure 2.

(a) Digitally-zoomed droplet image; and (b) normalized grayscale profile showing intensity variations across a droplet edge.
(a) Digitally-zoomed droplet image; and (b) normalized grayscale profile showing intensity variations across a droplet edge.

Figure 3.

Schematic of diffraction of light by a droplet.
Schematic of diffraction of light by a droplet.

Figure 4.

(a) Image of a stainless-steel sphere; and (b) normalized grayscale profile across the sphere.
(a) Image of a stainless-steel sphere; and (b) normalized grayscale profile across the sphere.

Figure 5.

(a) Image of a glass sphere; and (b) normalized grayscale profile across the sphere.
(a) Image of a glass sphere; and (b) normalized grayscale profile across the sphere.

Figure 6.

(a) Simulated image of a 3 mm droplet in the geometrical optics limit; and (b) the intensity profile along a line through the droplet center.
(a) Simulated image of a 3 mm droplet in the geometrical optics limit; and (b) the intensity profile along a line through the droplet center.

Figure 7.

(a) Simulated image of a 3 mm droplet with completely coherent backlighting; and (b) the intensity profile along a line through the droplet center.
(a) Simulated image of a 3 mm droplet with completely coherent backlighting; and (b) the intensity profile along a line through the droplet center.

Figure 8.

(a) Simulated image of a 3 mm droplet with completely incoherent backlighting; and (b) the intensity profile along a line through the droplet center.
(a) Simulated image of a 3 mm droplet with completely incoherent backlighting; and (b) the intensity profile along a line through the droplet center.

Figure 9.

(a) Simulated image of a 3 mm droplet with partially coherent backlighting; and (b) the intensity profile along a line through the droplet center.
(a) Simulated image of a 3 mm droplet with partially coherent backlighting; and (b) the intensity profile along a line through the droplet center.

Figure 10.

Circle fit schematic.
Circle fit schematic.

Figure 11.

Results from an analysis of the image in Figure 4a: (a) first iteration; (b) second iteration; and (c) third iteration.
Results from an analysis of the image in Figure 4a: (a) first iteration; (b) second iteration; and (c) third iteration.

Figure 12.

Calculated sphere diameter as a function of the normalized light intensity that was assumed to correspond to the sphere edge.
Calculated sphere diameter as a function of the normalized light intensity that was assumed to correspond to the sphere edge.

UT1

Geometrical Optics: E2 = E1, I2 = I1
Completely Coherent: E2 = E1 ⊗ h, I2 = E2E2*
Completely Incoherent: I2 = (hh*) ⊗ I1
Partially Coherent: E2 = (E1T) ⊗ h, < I2 > = < E2E2* >
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