Underwater Winches Ensure Sonar Data Quality

MacArtney's underwater winch system is capable of launching and retrieving an extensive range of underwater oceanographic equipment at any preset interval range to provide regular data about the water column via a fibre communication link onshore. Based on extensive experience of winch systems and underwater technology, the underwater winch is designed to be sturdy and reliable for a long lifespan.

One of the many applications for the underwater winch system is collecting water column data to accurately adjust sonar data, compensating for a range of underwater influences that can distort sonar readings. Sensors provide onshore computers with the measurements they need to perform adjustments that make the sonar data as accurate as possible, processing the data digitally to account for distortions.

The new underwater winches, installed on the seabed, reel out a buoy with a CTD installed. The CTDs will measure conductivity, temperature and depth to calculate the derived salinity and density. These readings are taken every 30 minutes and sent to onshore computers. This data makes it possible to precisely calibrate the sonar readings. They can be installed as single units or in a group or pattern of several systems.

The types and frequency of water column readings varies enormously from one project to another. Some applications require almost continual monitoring of water conditions, whilst others may need checking at longer intervals. MacArtney's underwater winch system can be programmed to run varying sequences according to the project, for example launch twice an hour or once a day. The system can also be designed to suit requirements and the winch mounted with whichever sensor or monitor is most suitable for the project. It can monitor a wide range of conditions in fresh or sea water systems.

Several features have been integrated into the system to help ensure that the winch works optimally from the sea floor. A foundation is positioned on the seabed so that the winch that is mounted on it sits as flat and evenly as possible and the winch drum material has been specifically chosen to be lightweight yet strong and have an extended lifespan in situ. The cable that links the winch to onshore provides both fibre communication and power supply. Oil compensation in the winch box ensures that pressure is correctly compensated, provides a cooling system for the winch motor and allows the winch to function on the sea bed.

The challenges that fixed underwater winches face depend on where they are installed. Depth, water temperature, oxygen and other natural processes, such as fouling, can affect how a system works. Servicing at specific intervals and maintenance ensures that the winch works optimally and that the oceanographic measuring equipment functions correctly and continues to make precise readings. MacArtney's underwater winch systems are designed with a long lifespan of 20 years with the correct service and maintenance.