Accession Number : ADD002417

Title :   Towable VLF Sonar Projector.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Abbott,Frank R

Report Date : 13 Jan 1976

Pagination or Media Count : 7

Abstract : The patent relates to a method whereby an improved line array transducer increases its effectiveness by ensuring a more responsive trailing as it is towed through the water. An elongate sleeve contains a number of longitudinally spaced transducer elements which are responsive for the transmission of reception of acoustic energy. An interconnected, flexible bladder carried inside of a towing is coupled to the elongate sleeve. As the paravane leads the line array to its predetermined operational depth, the more compliant bladder yields to the pressure and is compressed. This compression of the bladder forces a contained gas into the interior of the elongate sleeve and the transducer's interiors to pressure compensate the array. By suitably choosing the materials and appropriately dimensioning the bladder, sleeve and transducer elements, an essentially neutrally buoyant line array is fabricated for deployment at the predetermined operational depth. Such an array trails responsively and does not generate excessive flow noise.

Descriptors :   *Sonar projectors, *Transducers, *Towed arrays, *Patents, Bladders, Underwater equipment, Inflatable structures, Buoyancy, Very low frequency

Subject Categories : Marine Engineering
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE