ROVworld Subsea Information

Discovering the colour of coral
Date: Friday, June 19, 2009 @ 14:00:00 EDT

Discovering the colour of coralCoral, never before seen in colour - and fish never seen alive, nor in their natural habitat - have been filmed by a Saab Seaeye Falcon DR ROV in an expedition to discover new coral communities deep in the Gulf of Mexico.

The four year project is investigating a series of unexplored sites along the northern Gulf of Mexico between 300 and 1000m, and is funded by the NOAA Office of Ocean Exploration and Research, and the US Mineral Management Service.

Deployed from the NOAA ship Nancy Foster, the Seaeye Falcon is undertaking large scale photographic surveys and collecting key species in a project known as Lophelia II 2008: Deepwater Coral Expedition: Reefs, Rigs, and Wrecks.

The ROV also gathers information on conditions for coral colonization and growth. Sensors on the ROV will acquire data on temperature, salinity, dissolved oxygen concentration, pH, turbidity (amount of material suspended in the water) and fluorescence (how much of the suspended material is plant matter from the upper depths of the ocean or land).

SeaView Systems, owners of the 1000m deepwater rated Falcon ROV, subcontracted their vehicle to Seavison Marine Services for the project. The ROV comes complete with a full inspection and sample collection suite that includes external Nuytsun LED illumination, Hydrolek 5 function manipulator, Linkquest USBL acoustic positioning and Tritech altimeter. It operates from a 20' shipping container which acts as a combined control van/workshop.

Running the SeaView ROV operation is Matthew Cook, who says that the combination of a seven-megapixel Westech digital still camera and the Nuytsun LED module has enhanced video and digital still quality, '... and achieved excellent quality images that have exceeded the client's expectations'.

The key to operating these units, and all the equipment aboard the ROV, is a distributed intelligence control system where each of the 128 devices can be individually controlled by its own microprocessor.

Vital to sharp images and the delicate recovery of specimens, is the ability of the ROV to be highly manoeuvrable and hold station in strong cross currents. Five brushless DC thrusters make this possible with each thruster's drive electronics giving velocity feedback for precise control in all directions.

Matt Porter, from Pennsylvania State University, reported in, that the Falcon ROV is one of the most important pieces of equipment on the expedition.

'For scientists engaging in deep-sea research, the ROV is an extension of themselves, serving as both their eyes and hands at depths too extreme for human life. Without the video and still cameras and manipulator arm on the ROV, detailed observations and collections of deep-sea life would be difficult'.

He suggests that, equipped with a high-resolution low-light video camera and a seven-megapixel camera for still shots, along with a robotic manipulator that mimics a human arm and hand, the Falcon is a fully competent human substitute.

This article comes from ROVworld Subsea Information

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