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Interpretation of Backlit Droplet Images from ISS Droplet Combustion Experiments Cover

Interpretation of Backlit Droplet Images from ISS Droplet Combustion Experiments

Gravitational and Space Research
Volume 2 (2014): Issue 1 (July 2014)
By: Fei Yu and  Benjamin D. Shaw  
Open Access
|Jan 2022

Figures & Tables

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* >
DOI: https://doi.org/10.2478/gsr-2014-0007 | Journal eISSN: 2332-7774
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Language: English
Page range: 82 - 93
Published on: Jan 18, 2022
Published by: American Society for Gravitational and Space Research
In partnership with: Paradigm Publishing Services
Publication frequency: 2 issues per year
Keywords:
Droplet Combustion,
Image Analysis,
International Space Station,
Partial Coherence
Related subjects:
Life sciences,
Life sciences, other,
Materials sciences,
Materials sciences, other,
Physics,
Physics, other

© 2022 Fei Yu, Benjamin D. Shaw, published by American Society for Gravitational and Space Research
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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