Abstract:
A marine streamer cable of layered solid construction and having substantially the same composition density as sea water, comprising a flotation layer surrounding a cable core having as a central stress member a polypropylene rope made with paralleled fibers held together by an extruded plastic jacket, the use of which minimizes the weight of the cable and serves to greatly attenuate the propagation along the cable of mechanical noise.
Abstract:
A marine hydrophone for producing electrical signals responsive to sound pressure waves in water, and especially adapted for use in towed seismic streamers. The hydrophone includes an annular piezoelectric ring with electroded inner and outer surfaces and a pair of thin circular diaphragms covering the opposite ends of the ring. The diaphragm portions within the inner surface of the ring are permanently formed inwardly toward each other. An assembly of a pair of such hydrophones supported by resilient rings on opposite ends of an axially elongated support cylinder mounted within an cylindrical enclosure having perforated end caps and mounted by a resilient tube between streamer spaces is also disclosed.