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Study on the Acoustic Inversion of Bubble Size Distribution

Author: XiePing
Tutor: LinJu
School: Ocean University of China
Course: Acoustics
Keywords: Bubble distribution The resonance the estimated method Acoustic attenuation coefficient Wind inversion
CLC: P733.2
Type: Master's thesis
Year: 2011
Downloads: 85
Quote: 1
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Abstract


Surface wave breaking the air drawn into the seawater , the formation of air bubbles in the sea surface layer . The bubble is the main one of the scattering body seawater , bubble interested acoustic cause scattering and attenuation , affecting the propagation of sound waves in seawater . The same time, the bubbles generated or vibration generated when the sound is one of the important sources of marine environment noise . In addition , sea surface and subsurface bubbles have an important role in the physical oceanography research , will affect the heat exchange between the air-sea . Therefore , the sea surface bubbles distribution of sound propagation and noise of the marine environment is of great significance . Study bubbles mainly acoustic and optical methods , this article using the acoustic method for bubble distribution inversion study . First analyze the acoustic characteristics of the bubble , the relationship between the bubble distribution and acoustic attenuation formula is derived and analyzed using acoustic data inversion bubble distribution method - Medwin resonance estimation method . When the bubble radius is large , Medwin resonance there is a certain inversion error estimation method inversion bubble distribution , high porosity , resonance estimated inversion bubble distribution from the true bubble distribution . This paper in the inversion process on the case of low porosity and high porosity improvements , the introduction of the speed of sound correction and Andreeva-Weston (AW) model updating . Can be seen from the results of numerical simulation processing , the resonance estimation method can be improved more accurate bubble distribution . By laboratory measurements of the sound data , the use of the improved the resonance estimation method inversion obtained distribution of bubbles , bubbles inversion results of the experiment and the electrolysis method , the bubble radius measured by optical methods were compared between the two anastomosis better. The resonance estimation method , improved processing and analysis of the experimental data at sea in August 2010 and November inverted bubble distribution . Bubble distribution of sea surface and sea surface wind speed and sea surface wind speed inversion , inversion results are consistent with the measured wind speed .

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CLC: > Astronomy,Earth Sciences > Oceanography > Marine basic science > Marine physics > Ocean acoustics
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