Dual-Section Push-Pull Underwater Projector
Patent, Filed 21 Dec 1998, patented 7 Sep 1999
DEPARTMENT OF THE NAVY WASHINGTON DC
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The present invention relates to an underwater acoustic projector comprising a housing formed from a rigid material, a fixed plate secured to the housing, a first annular electrostrictive ring and a second annular electrostrictive ring positioned on one side of the fixed plate, and a third annular electrostrictive ring and a fourth annular electrostrictive ring positioned on a second side of the fixed plate. The first and second annular rings are separated by a first moving plate, while the third and fourth annular rings are separated by a second moving plate. The annular rings are formed from lead magnesium niobate or lead magnesium niobate-lead titanate and are wired for dual push-pull operation for reducing the non-linearity of the response of the annular rings.