The simultaneous study of light emissions and shock waves produced by cavitation bubbles

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Abstract
Light pulses (sonoluminescence) and pressure pulses produced by the collapse of cavitation bubbles are investigated simultaneously by means of an optical cable connected to a photomultiplier (PM) and a miniature piezoelectric probe. All collapses do not systematically lead to the occurrence of a pulse on the PM anode. The maximum occurrence is one anodic pulse per 4.6 ultrasonic periods. Pulse height analysis of anodic pulses indicates that the most probable pulse is the one producing the emission of one photoelectron by the photocathode of the PM. Simultaneous pulse height analysis shows that no correlation exists between the pulse heights of the two types of pulse. Numerical resolution based on the Kirkwood–Bethe–Gilmore equation and on the ’’hot spot’’ theory of Noltingk and Neppiras [Proc. Phys. Soc. (London) B63, 674 (1950); B64, 1032 (1951)] indicates that collapsing bubbles subjected to analysis display the same initial radius (?1 μm) and that they collapse at varying distances from the probe.

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