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Fast Imaging Technique to Study Drop Impact Dynamics of Non-Newtonian Fluids
Published on: March 5, 2014
Single-camera method to determine the optical axis position of ellipsoidal drops
B K Jones1, J R Saylor, L F Bliven
1Department of Mechanical Engineering, Clemson University, Clemson, South Carolina 29634, USA.
Applied Optics
|March 6, 2003
Summary
This study enhances droplet size measurement by accurately locating non-spherical drops using optical imaging. This allows for increased depth of field, improving measurement accuracy for deformed water drops and other objects.
Area of Science:
- Optical imaging
- Fluid dynamics
- Metrology
Background:
- Droplet sizing via optical imaging often necessitates a shallow depth of field to maintain consistent magnification.
- Accurate droplet localization along the optical axis can enable variable magnification, thus increasing the depth of field.
Purpose of the Study:
- To demonstrate the ability to locate the position of objects that deviate from sphericity.
- To extend previous methods for droplet localization to non-spherical objects, including deformed water drops.
Main Methods:
- Utilized back-illumination of objects to capture image characteristics for positional determination.
- Tested the method with spherical glass objects, deformed water drops, and glass ellipsoids.
- Investigated the influence of refractive index on positional accuracy.
Main Results:
- Successfully demonstrated the localization of non-spherical objects, including deformed water drops.
- Validated the ability to determine object position even when deviating significantly from a spherical shape.
- Provided insights into the role of refractive index in the localization process.
Conclusions:
- The developed method allows for accurate positioning of non-spherical objects, overcoming limitations of previous techniques.
- This approach enables increased depth of field in optical imaging for droplet sizing, improving accuracy for real-world scenarios like large raindrops.
- The findings are applicable to various fields requiring precise measurement of non-spherical fluid interfaces.
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