Sea Technology

OCT 2013

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

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MORE SOLUTIONS. (Left) BASDA14. v2 without mast at RTsys's manufacturing site in Caudan, France. (Right) BASDA14.v3 drifting off the south coast of Brittany, France, as it takes measurements. four hydrophone channels, it is possible to ensure the collection of a variety of data, for example, combining cetacean-sensitive broadband hydrophones with low-sensitivity sensors for high-level noises or using multichannel acquisition for beamformings. Ship Noise BASDA14 is very well-adapted to ship-noise measurements. It is advised to leave the buoy drifting to allow for changing speeds, arrival angles and distances from the measurement station. The four hydrophone inputs allow for hydrophone arrays of different confgurations, changing the number of hydrophones, as well as length and sensitivity regarding the type of vessel and the characteristics of the zone where measurements are made. The Wi-Fi broadband transmission, 3 megabytes per second at 1 kilometer, allows the streaming of data in real time. After each passage of the ship, it is possible to quickly verify the feld data that have been measured. Then, a decision can be made to adapt speed, angle, etc. before the next passage. The GPS position is recorded synchronously with acoustic data to position the measured vessel from the BASDA14 buoy. Additional digital information can be implemented and synchronized with acoustic data to maximize measurement accuracy, such as external compass, inclinometer or CTD sensors that can be placed along the hydrophone line. Piling Noise Monitoring BASDA14 technology makes realtime noise monitoring over a large area possible by placing several buoys at different key locations during operation. BASDA14 buoys are equipped with their own rechargeable batteries that run for several weeks. All BASDA14 systems are accessed simultaneously so that it is possible to display information from buoys at different locations on the same screen. Thanks to this feature, the operator can quickly have information regarding the noise generated and can make decisions on whether operations should be stopped. If an event has been spotted, key raw data can be recovered at a distance to double check and redact mission reports. Simultaneously, BASDA14 can continue to log data while downloading so that no information is lost. In addition, more digital sensors can be implemented to provide information on different parameters, such as turbidity and oxygen. Ongoing Projects, Developments BASDA14 is currently being used for ship-noise measurement, ambient noise recordings in the Arctic and mammal recordings in the Indian Ocean. For these projects, the technology has been adapted, such as implementing different sensors or satellite communication modes. Advanced processing, such as for mammal detection, sends an alert when a noise threshold is passed or a mammal is spotted. Recorded data are then scanned in order to double check the processing, which is important for detecting impact on mammals during offshore projects. More work is being conducted with partners to enhance the performance of BASDA14 buoys. RTsys is implementing active acoustics and more processing functionalities to further develop the singular mobile technology for a broad range of underwater acoustic measurements. n Luc Simon is the RTsys international project manager. He has worked on the technical and business development of RTsys passive acoustic systems. Simon holds an undergraduate degree in embedded electronics and a master's degree in international business development. www.sea-technology.com MORE DEPTH. MORE VALUE. Strong Back Config Pop-up Config PORT ACOUSTIC TRANSPONDING RELEASES Check Out the SPORT Pop-Up Recovery System at edgetech.com/pop-up-rec-sys The Leader in Underwater Technology Acoustic Releases | USBL | MRU Side Scan Sonar | Sub-bottom Profilers Bathymetry | AUV & ROV Sonars Combined & Customized Solutions For more information, visit EdgeTech.com info@edgetech.com USA 1.508.291.0057 October 2013 / st 29

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