Passive acoustic bubble spectroscopy

 

The bubble natural frequency (as given by Minnaert in 1933) and the damping (as given by Devin) can be combined in a model which can be used to obtain the bubble size distributions from the natural acoustic emissions. This process is called passive acoustic bubble spectroscopy. It is used for many purposes, including those listed in purple:

 

 

  • •Atmosphere/ocean flux of momentum, energy and mass

  • •Shallow water acoustics

  • •Ambient noise

  • •Communication and sensors

  • •Precipitation

  • •Wave dynamics

The picture to the left shows a wave breaking over a rig positioned in the North Sea surf by T G Leighton and students (AD Phelps and DG Ramble) to measure bubbles generated by breaking waves

 You may wish to contrast this passive acoustic bubble spectroscopy  with active acoustic bubble spectroscopy, the topic of  which can be found by clicking here

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© T G Leighton 2004