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Method and apparatus for improving the shallow water performance of a depth sounder

  • US 4,916,674 A
  • Filed: 04/06/1989
  • Issued: 04/10/1990
  • Est. Priority Date: 04/06/1989
  • Status: Expired due to Fees
First Claim
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1. Apparatus for use in an aquatic vessel for improving the shallow water response of a depth sounding system having a depth sounder for indicating the depth of water beneath said vessel and a transducer coupled to said depth sounder, comprising:

  • acoustic delay means interposed between the face of said transducer and the water at the bottom of the vessel for coupling acoustic energy for said transducer into the water beneath said vessel and for coupling return pulses to said transducer, said acoustic delay means being provided with a predetermined delay time that exceeds the time associated with transducer ring; and

    means for automatically subtracting from the indicated depth of the water from said depth sounder the depth added by the interposition of said delay means for permitting indication of shallow water depth.

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