TY - JOUR
T1 - Nonlinear, low-frequency sound generation in a bubble layer
T2 - Theory and laboratory experiment
AU - Ostrovsky, Lev A.
AU - Sutin, Alexander M.
AU - Soustova, Irina A.
AU - Matveyev, Alexander I.
AU - Potapov, Andrey I.
PY - 1998
Y1 - 1998
N2 - The difference-frequency sound generation as a result of interaction of two high-frequency harmonic waves in a bubble layer in water is investigated both theoretically and experimentally. Because the sound speed in the layer is less than that outside, the layer has resonance properties. As was shown before, this can considerably increase the efficiency of the nonlinear frequency transformation. However, unlike the cases considered before, the layer resonance is practically achievable only at the low (difference) frequency, whereas the high-frequency signal (pump) resonates at individual bubbles and then it strongly dissipates. Here the results of an experiment with a bubble layer with a thickness of about 10 cm in an anechoic tank are presented. One of the incident (primary) wave frequencies was 60 kHz, whereas the other could be varied, thus providing the low-frequency signal in the range of 0.8-14.8 kHz. Due to the first-mode layer resonance, this secondary signal had a pronounced maximum at a frequency of 2.4 kHz. The high attenuation of pump waves was due to resonant bubbles. A theory which agrees with the experimental results reasonably well, is developed for this type of interaction.
AB - The difference-frequency sound generation as a result of interaction of two high-frequency harmonic waves in a bubble layer in water is investigated both theoretically and experimentally. Because the sound speed in the layer is less than that outside, the layer has resonance properties. As was shown before, this can considerably increase the efficiency of the nonlinear frequency transformation. However, unlike the cases considered before, the layer resonance is practically achievable only at the low (difference) frequency, whereas the high-frequency signal (pump) resonates at individual bubbles and then it strongly dissipates. Here the results of an experiment with a bubble layer with a thickness of about 10 cm in an anechoic tank are presented. One of the incident (primary) wave frequencies was 60 kHz, whereas the other could be varied, thus providing the low-frequency signal in the range of 0.8-14.8 kHz. Due to the first-mode layer resonance, this secondary signal had a pronounced maximum at a frequency of 2.4 kHz. The high attenuation of pump waves was due to resonant bubbles. A theory which agrees with the experimental results reasonably well, is developed for this type of interaction.
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U2 - 10.1121/1.423308
DO - 10.1121/1.423308
M3 - Article
AN - SCOPUS:0031828494
SN - 0001-4966
VL - 104
SP - 722
EP - 726
JO - Journal of the Acoustical Society of America
JF - Journal of the Acoustical Society of America
IS - 2 I
ER -