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Membrane hydrophone having inner and outer membranes

  • US 5,339,290 A
  • Filed: 04/16/1993
  • Issued: 08/16/1994
  • Est. Priority Date: 04/16/1993
  • Status: Expired due to Fees
First Claim
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1. An acoustic device comprising:

  • a support structure having an interior;

    an outer suspension membrane fixed to said support structure and extending from said support structure to said interior, said outer suspension membrane having an opening therethrough;

    an inner transducer membrane suspended within said interior in spaced relation to the support structure by said outer suspension membrane, said inner transducer membrane having a piezoelectrically active area aligned with said opening through said outer suspension membrane;

    means for attaching said outer suspension membrane to said inner transducer membrane; and

    electrode means for conducting electrical charge from said piezoelectrically active area.

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