Accession Number : AD1048727


Title :   Osmotic Acoustic Source


Descriptive Note : Technical Report


Corporate Author : Naval Undersea Warfare Center Newport


Personal Author(s) : Ruffa,Anthony A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1048727.pdf


Report Date : 25 Sep 2017


Pagination or Media Count : 18


Abstract : An acoustic projector is provided with an enclosure having a semi-permeable membrane on one side. High salinity liquid is injected at the enclosure to increase osmotic pressure. Valves thereafter allow free flooding between the enclosure and surrounding seawater to equalize the pressure. Transient pressure in the enclosure generates a pressure pulse that propagates from the semi-permeable membrane. The timing of the injection by salt jets and the free-flooding valves enables a repeatable acoustic pulse at low frequencies and a determinable upper frequency. If the acoustic projector is mounted to be conformal to the hull of a ship; the acoustic projector includes a free-flowing region on one side of a semi-permeable membrane and valves. When the valves are opened; the other side of the membrane is free-flooded. Salt jets inject high salinity liquid into an enclosure to increase pressure with the result of an acoustic pressure pulse.


Descriptors :   OSMOTIC PRESSURE , low frequency , sound pressure , acoustic measurement , salinity , valves


Subject Categories : Biochemistry


Distribution Statement : APPROVED FOR PUBLIC RELEASE