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Transcript of Sonoluminescence
Different solvents affect the intensity of the light and the size of the bubble.
The direction and the intensity of the surrounding electromagnetic fields affect the intensity of the light.
The spectrum of the light varies with its brightness
Time: May need 1 month to set up the apparatus and capture the picture
----The gas dissolved in the water
Temelly, Faith & Quinn
Light is emitted by tiny bubbles suspended in a liquid subjected to intense acoustic fields
Single-bubble SL (SBSL)
Discovered in 1988
Multi-bubble SL (MBSL)
Discovered in 1934
One of the most mysterious phenomena?
How is it formed?
What is in the bubble?
---- Nuclear fusion?
Brief duration: shorter than 100 picoseconds
Small size: 1 µm when the light is emitted
R: the radius of the bubble t: time
μ: viscosity p: the pressure
: the surface tension
How to create and observe sonoluminescence
Piezo-ceramic transducers (2 big ones 16mm in diameter, 8mm thick)
Mounted and wired
To create standing waves and achieve the resonance of the flask
Principle and method: Trap a stable sonoluminescing bubble at the centre of a flask energised at its acoustic resonance
Signal generator (digital):
Supply the certain frequency of ultrasonic waves (25kHz~30kHz)
Partially-used 500g spool of 0.5mm diameter enamelled copper wire, tuned by sliding a ferrite rod up and down the centre of the plastic spool
A high-speed camera with 30 seconds of exposure
A 100-ml flask
A rubber bung
What may be needed
A photomultiplier or a CCD sensor
Observations should be done in the dark by eyes or a camera
youtube: http://www.youtube.com/ watch?v=2yHDeKFW8j8
Accessed date: 09/02/2014