Journal: Ultrasonics Sonochemistry
Article Title: Sonoluminescence from single cavitation bubbles near solid surfaces
doi: 10.1016/j.ultsonch.2026.107815
Figure Lengend Snippet: (a) High-speed sequence of the first oscillation of a cavitation bubble generated close to a solid boundary in side view in the cavitation erosion regime. The timestamp t = 0 is defined as the frame closest to the bubble generation. Then, the bubble reaches maximum size after 46 μ s, and collapses in a toroidal shape at t = 95 μ s . The toroidal shape close to collapse is only visible in normal view, e.g., . The scale bar is 400 μ m . The whole video is presented in Supplementary Movie 1, and a higher frame rate video of a similar event in Supplementary Movie 2. (b) Normalized light intensity emitted during bubble collapse near a boundary as a function of the non-dimensional distance γ with added erosion rate measurements from for comparison. In inset, representation of the non-dimensional distance parameter γ = h / R max in the experiment, where h is the distance of the laser focus from the boundary, and R max the bubble radius at maximum expansion, measured perpendicular to the surface.
Article Snippet: For these measurements the ultra high-speed camera ( ) was combined with a 20 × magnification long working distance microscope objective (Edmund Optics, numerical aperture 0.42, resulting magnification 1 .
Techniques: Sequencing, Generated, Comparison