Abstract:
A distributed array hydrophone comprising an array of hydrophones each comprising a ceramic doublet assembly of hollow radially oppositely polarised members end held in a bobbin by decoupling means, the bobbins being linearly interconnected by semiflexible spacing members, the array being encapsulated in a vibration transmitting potting medium in a tube formed of a pressure-wave transmitting medium.
Abstract:
Novel laminate tubular articles (10) comprising an outer layer (12) having a modulus of at least about 10 Pascals, an interior layer (18) comprising a polymeric material having a loss tangent of at least about 0.5 at a temperature of from about 0 C to about 40 C at a frequency of from 10-4,000 Hz and whose modulus is less than the modulus of the outer layer and an innermost layer (14) having modulus greater than the modulus of said interior layer. The invention further relates to a device for sensing in a body of water, said device comprising at least one sensor (20) surrounded by the novel laminate tubular articles of the invention. The mechanical and acoustic properties of the article make it particularly appropriate for use as the hose in a towed-array sonar system.
Abstract:
A hose assembly (100) for use underwater or in a wet or severe environment is provided. The hose assembly includes a hose (30) having an interior space (33) and extending in a longitudinal direction. A first termination assembly (50) terminates the hose at a first end (31) and a second termination assembly (60) terminates the hose at a second end (32). A signal carrier (10) is disposed in the interior space of the hose and extends between the first and second termination assemblies. A strength member (20) is disposed in the interior space of the hose.
Abstract:
Die Erfindung betrifft ein Verfahren zum Ermitteln einer Parameterinformation eines Unterwasserkabels, wobei das Unterwasserkabel wenigstens ein Leiterpaar aufweist über welches eine digitale Signalübertragung mittels eines digitalen Signals erfolgt, wobei dem digitalen Signal eine Redundanzinformation hinzugefügt wird mittels der eine Kanalinformation ermittelt und eine Momentan-Kanalinformation mit einer Referenz-Kanalinformation verglichen wird, sodass die Parameterinformation vorliegt.
Abstract:
Die Erfindung betrifft ein Verfahren zum Kompensieren einer Kabeleigenschaft eines Unterwasserkabels, wobei das Unterwasserkabel wenigstens ein Leiterpaar und einen Abschlusswiderstand aufweist, wobei mittels des Leiterpaars eine digitale Signalübertragung eines digitalen Signals erfolgt, wobei dem digitalen Signal eine Redundanzinformation hinzugefügt und die Redundanzinformation ausgewertet wird, sodass ein Auswerteergebnis vorliegt, wobei mittels des Auswerteergebnisses der Abschlusswiderstand eingestellt wird.
Abstract:
A system for ocean bottom sensing for performing geological survey. Herein the system comprising a cable further comprising a cable jacket (9), at least one optical fiber (6), and a plurality of detectors enclosed by the cable jacket (9). The latter including at least a first and a second detector (1, 2), the at least first and second detector (1, 2) comprising at least one intrinsic fiber optic sensor (3x, 3y, 3z, 3h, 3g, 3t). The detectors are communicatively connected to the at least one optical fiber (6) for allowing interrogation of the intrinsic fiber optic sensors (3x, 3y, 3z, 3h, 3g, 3t) and the cable jacket (9) has substantially a same cross-sectional diameter (D) and same outer shape at the at least first and second detector (1,2) and in between said first and second detector (1,2).
Abstract:
A seismic streamer in accordance to aspects of the disclosure includes an outer skin formed in a longitudinally extending tubular shape, an inner surface of the outer skin defining an internal volume, a strength member that extends through the internal volume in a direction parallel to that of the longitudinally extending tubular shape, a filler material disposed in the internal volume and a sensor housing located in the internal volume and internally disposing a seismic sensor.
Abstract:
A seismic streamer in accordance to aspects of the disclosure includes an outer skin formed in a longitudinally extending tubular shape, an inner surface of the outer skin defining an internal volume, a strength member that extends through the internal volume in a direction parallel to that of the longitudinally extending tubular shape, a filler material disposed in the internal volume and a sensor housing located in the internal volume and internally disposing a seismic sensor.
Abstract:
It is described an attachment device (2) for attaching a seismic node to a cable (1), the attachment device comprising an in-line fastening device (6) fastening the cable (1); and at least one locking device (3) securing the cable (1) in the at least one in-line fastening device (6). The locking device (3) prevents the cable (1) from escaping the fastening device (6). A seismic node and a method for deployment and retrieval of a number of seismic nodes are also described.
Abstract:
The present invention provides a marine cable device configured for preventing or reducing biofouling along its exterior surface, which during use is at least temporarily exposed to water. The marine cable device according to the present invention comprises at least one light source configured to generate an anti-fouling light and at least one optical medium configured to receive at least part of the anti-fouling light. The optical medium comprises at least one emission surface configured to provide at least part of said anti-fouling light on at least part of said exterior surface.