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Gravitational and Space Research
Band 2 (2022): Heft 1 (January 2022)
Uneingeschränkter Zugang
Interpretation of Backlit Droplet Images from ISS Droplet Combustion Experiments
Fei Yu
Fei Yu
und
Benjamin D. Shaw
Benjamin D. Shaw
| 18. Jan. 2022
Gravitational and Space Research
Band 2 (2022): Heft 1 (January 2022)
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Article Category:
Research Article
Online veröffentlicht:
18. Jan. 2022
Seitenbereich:
82 - 93
DOI:
https://doi.org/10.2478/gsr-2014-0007
© 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.
Figure 2.
(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.
Figure 4.
(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.
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.
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.
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.
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.
Figure 10.
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.
Figure 12.
Calculated sphere diameter as a function of the normalized light intensity that was assumed to correspond to the sphere edge.
UT1
Geometrical Optics:
E
2
= E
1
, I
2
= I
1
Completely Coherent:
E
2
= E
1
⊗ h, I
2
= E
2
E
2
*
Completely Incoherent:
I
2
= (hh
*
) ⊗ I
1
Partially Coherent:
E
2
= (E
1
T) ⊗ h, < I
2
> = < E
2
E
2
*
>