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Abstract
The passage of sound through bubbly water is strongly attenuated by scattering and absorption. Such attenuation is most severe around the frequency of resonance of individual bubbles. A bubble takes a finite time to ring up to steady‐state conditions and continues to oscillate for a finite time after the driving pressure erases. Low backscatter for short pulse lengths has been observed in near‐surface seawater [Akulichev et al., Soc. Phys. Acoust. 32, no. 3]. An experiment is described that looked for a corresponding enhancement in transmission. Comparisons were made between the attenuations of brief waveform bursts and longer bursts. The frequency range of this experiment was 50–200 kHz. The bubbles were made by the electrolysis of fresh water in a small laboratory tank. For bursts of 6–20 wavelengths in duration, no difference in the attenuations was discerned in comparison with a 2.7 wavelength duration burst. [Work supported by ONR.]
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