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US 4,679,179 AGranted
Sonar detection apparatus
AssigneeRaychem Corporation
InventorThomas P. Lally
Life of this patent
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Abstract
Polymer compositions comprising a segmented urethane block polymer and an elastomer having a glass transition temperature between -40.degree. and +15.degree. C. possess a good combination of properties, including relatively high damping and modulus values. Radiation cross-linked tubing prepared from these compositions finds application in the jacketing of marine sonar detection arrays comprising hydrophones.
Claims9
Sonar detection apparatus suitable for towing behin a ship and comprising:
- (1) a longitudinally reinforced tube composed of a radiation cross-linked polymeric composition which comprises
- (a) 40 to 70 percent by weight, based on the total polymer, of a radiation cross-linked elastomer having a glass transition temperature of -40.degree. C. to +15.degree. C.;
- and
- (b) 60 to 30 percent by weight, based on the total polymer, of a segmented urethane block polymer
- and which has a damping coefficient of at least 0.1 at at least one frequency in the range from 1 Hz to 100 Hz at at least one temperature, in the range from 0.degree. C. to 25.degree. C.;
- (2) a plurality of hydrophones within said tube;
- and
- (3) an acoustic coupling fluid between the tube and the hydrophones.
5 more elements
Dependencies are inferred from the claim text.