12 August 1988 Optically Stimulated Sound From Oil Drops And Gas Bubbles In Water: Thermal And Radiation Pressure Optoacoustic Mechanisms
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Abstract
We detected and modeled the radiation of high-frequency sound by individual oil drops and gas bubbles in water in response to modulated green light having a peak power ~1 W. Drop radii were typically ~mm. In those cases where the drop was dyed (so as to absorb a significant fraction of the illumination), the magnitude of the radiated sound indicates that thermal expansion of the dyed oil was the principal mechanism for the production of sound. Bubbles radiated sound by a different mechanism. Bubble radii were in the 20-135 pm range. When illuminated by a short pulse, the sound radiated from the bubbles exhibited the ringing of a damped oscillator. This is evidence of monopole oscillations of the bubble's surface. Bubbles were subsequently illuminated with light modulated at the frequency of the ringing. The resulting sound was characterized by an amplitude enhancement which is the expected resonance response of an oscillator. The mechanism for driving the oscillations appears to be the compression of the bubble by modulated optical radiation pressure.
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Bruce T Unger, Bruce T Unger, Philip L Marston, Philip L Marston, } "Optically Stimulated Sound From Oil Drops And Gas Bubbles In Water: Thermal And Radiation Pressure Optoacoustic Mechanisms", Proc. SPIE 0925, Ocean Optics IX, (12 August 1988); doi: 10.1117/12.945740; https://doi.org/10.1117/12.945740
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