Researcher Explains Physics Behind Sonoluminescence
For 10 years scientists have struggled to explain the physics behind sonoluminescence, a phenomenon characterized by a tiny dot of light emanating from a solitary, sonically driven bubble.
In a paper that appeared in the April 1 issue of Nature, researchers led by Sascha Hilgenfeldt of Harvard University in Cambridge, Mass., present an explanation. Simply put, a sound wave causes a bubble to grow from about 5 µm in diameter to about 70µm. When the sound field becomes compressive, the bubble collapses from the inertia of the surrounding water. As the collapse accelerates, the gas inside the bubble compresses, and its temperature rises to 20,000 to 30,000 K, creating a plasma of ions, electrons and neutral atoms. As the energy density of the bubble is reduced, photons are emitted. The process is repeated about every 20 µs.
LATEST NEWS
- Exail Signs LLNL Contract, Partners with Eelume
Apr 26, 2024
- Menlo Moves U.S. HQ: Week in Brief: 4/26/2024
Apr 26, 2024
- Optofluidics Platform Keys Label-, Amplification-Free Rapid Diagnostic Tool
Apr 25, 2024
- DUV Lasers Made with Nonlinear Crystals Enhance Lithography Performance
Apr 25, 2024
- Teledyne e2v, Airy3D Collaborate on 3D Vision Solutions
Apr 24, 2024
- One-Step Hologram Generation Speeds 3D Display Creation
Apr 24, 2024
- Innovation Award Winners for Laser Technology Honored in Aachen
Apr 23, 2024
- Intech 2024: AI Arrives on the Shop Floor
Apr 22, 2024