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Mie scattering from a sonoluminescing bubble with high spatial and temporal resolution
Summary
Investigating single air bubbles in sound fields reveals light scattering shifts during cavitation collapse. This phenomenon, crucial for accurate bubble dynamics, impacts sonoluminescence and bubble-wall velocity measurements.
Area of Science:
- Acoustics
- Fluid Dynamics
- Optics
Background:
- Understanding bubble dynamics in resonant sound fields is key to fields like sonochemistry and medical ultrasound.
- Previous studies often simplified light scattering during cavitation collapse.
Purpose of the Study:
- To precisely characterize the dynamics of a single air bubble in a resonant sound field.
- To investigate light scattering mechanisms during bubble collapse and re-expansion.
Main Methods:
- Utilized Mie scattering and a high-resolution Streak camera for detailed observation.
- Analyzed spatial and temporal variations in scattered light intensity.
Main Results:
- Observed that scattered light intensity decouples from bubble radius near collapse.
- Identified that compressed surrounding water, not the bubble wall, dominates scattering in late collapse phases.
- Detected a scattered light intensity minimum preceding sonoluminescence emission.
Conclusions:
- Accurate modeling of bubble dynamics requires accounting for light scattering by compressed surrounding water.
- Neglecting this effect leads to significant overestimation of bubble-wall velocity.
- High-resolution imaging distinguishes scattering from bubble walls and shock waves during re-expansion.