Sea Technology

JUL 2013

The industry's recognized authority for design, engineering and application of equipment and services in the global ocean community

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the protection of the armored strength members to the connection point on the wet side junction box. One challenge with the OAWRS design was the very tight tolerance on the subcable terminated length, which was only 12 inches (+/.25 inches). The design dictated a severe space constraint between the ball joint of the mechanical termination and the connector due to the small package size (26 inches long by 8 inches diameter) and the location of the pressure vessel (9.44 inches long by 7.50 inches diameter) within the housing, which required fnesse and precision during the complex termination process. The OAWRS system was to be applied in both standalone, passive sensing applications, as well as paired with the OAWRS Source Array in active sensing deployments. The receiver array equipment suite included the synchronized hydrophone array, which allowed for high-resolution directional sensing over wide areas and a handling system designed to be quickly mobilized on a vessel of opportunity. Therefore, the system called for one single-mode fber to transmit the array data with a second, backup fber. The connector design was fnalized with the inclusion of two optical fbers to allow for seamless transition to the backup and two 16 AWG electrical power conductors. The connector development process began with terminating the single-mode optical fbers for the FR used in the wet side junction box, as there was no overmolding or mechanical termination needed for the FR. The FR was fully assembled and terminated inboard with 16 inches of stranded copper wire and optical fber with FC/PC connectors installed. Once the optical and electrical terminations were done, the FR could then be tested and set aside until the rest of the assembly was complete. (Top) Deep submergence hybrid BIRNS Millennium 3O-2F2-FR and CP mated connector pair, with two single-mode optical fbers and two 16-AWG electrical pins, with fnal EOM assembly. (Top Middle) OAWRS system's wet side junction box comes aboard during testing performed in Lake Chelan, Washington, in October 2012. (Middle Right) One of two single-mode fbers is illuminated on the hybrid BIRNS Millennium 3O-2F2-CP connector during individual fber continuity testing with a visual fault locator. (Bottom) An OAWRS team evaluates the design and construction of the vibration isolation module during a sea test in deep water south of Cape Cod, Massachusetts, in December 2012. 18 st / July 2013 www.sea-technology.com Assembly Development Stress in a cable assembly can become concentrated where the load path changes, as is the case with the ball-and-socket joint used on this project, and is therefore the location where the most care must be taken to smooth out those changes. The termination allowed the cable strength elements and core to exit in a straight line, and BIRNS's technicians worked to effect a gradual, continuous transition from the strength wires to the socket area, keeping the EO wires and fbers in a uniform arrangement. The cable's strength member was carefully spread and shaped to maximize its surface area. The initial mechanical termination included meticulously bending the strength member's armored wires around the mechanical insert to optimize mechanical load-bearing capabilities. Once the mechanical insert chock was prepared and the cable core complete, the technicians could determine the relative length needed for the corresponding fbers. The mechanical termination was fully complete at this point except for its fnal chemical adhesive potting, which would come after the optical and

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