Abstract: The invention relates to a marine-seismic streamer having a liquid-filled tube (4) in which there are arranged, in the longitudinal direction, hauling cables and flow-obstructing devices including shaped pieces (2) which are spaced apart in the longitudinal direction for dividing the streamer into sections, and hydrophones (5). The shaped pieces (2) are of cylindrical construction with an outside diameter smaller than the inside diameter of the tube (4) such that an annular gap (9) is formed between the tube (4) and each shaped piece (2). The shaped pieces (2) have at least one annular seal (10), the outer diameter of the annular seal (10) corresponding to the inside diameter of the tube (4).

Abstract: A hydrophone for a marine seismic streamer has a pressure sensor with outer membrane surfaces on which piezoelectric sensors (4, 5) are secured. The pressure sensor is formed from two spaced steel disks (1, 2) having recesses directed toward one another and which are laser-welded at the edges in a gas-tight manner. The pressure sensor is electrically insulated from its external environment by a synthetic resin coating, which may enclose the entire pressure sensor, including the connecting wires. A method of making the hydrophone is also disclosed. The hydrophone can be manufactured so as to be small in dimensions and weight, is mechanically sturdy and capable of withstanding overload, as well as being protected by the synthetic resin coating against short circuiting and corrosion.

Abstract: An improved seismic measuring cable includes a series of hose sections containing hydrophones or the like joined together by coupling devices having cylindrical sections carrying sleeves joined to the hoses and half-tube portions joinable to each other. Each half-tube portion has castellations which interlock with a like half-tube portion to form a tension-resisting cylindrical closed volume for containing electrical connectors to interconnect wires leading to the hydrophones, the interlocked half-tubes being then covered by a cylindrical jacket. Tension load cables extend between the coupling devices at opposite ends of a hose section. The hoses can be oil filled. Embodiments of hose supporting members, hydrophone supports and joining means are disclosed.