Acoustical Bubble Spectrometry at Sea
We’ve come a long way since the early 1960s when a prominent oceanographer wrote a memorandum titled “Do Invisible Microbubbles Exist in the Sea?” Our first bubble count at sea used an optical technique . But the optical scattering cross section is at most equal to the geometrical cross section. Therefore, photographic techniques are restricted to small volumes. Furthermore, the optical identification of bubbles in a sea laden with detritus requires at least proof of sphericity. For small bubbles this proof is additionally constrained by the Rayleigh criterion for resolution.
KeywordsClay Attenuation Cavitation Refraction Compressibility
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