Chelsea's hydrophone arrays used to study the reactions of fish to sound
15/03/2013 Chelsea Technologies Group Ltd
"Chelsea has been working with the Norwegian University of Science and Technology (NTNU) for a number of years", said Chelsea's acoustics specialist Paul Bolton, "they initially commissioned us to custom design a 6m vertical acoustic hydrophone array in order to conduct novel underwater acoustic experiments. This was followed by the design of three 8m long, active hydrophone arrays. These arrays are now being used to map the sound field inside a fish pen at Austevoll, just south of Bergen.The reactions of a school of herring (ca. 10000 fish) to waterborne acoustic signals and noise of various types is currently being studied to get a better understanding of the environmental impact human-made noise can have on fish. The primary objective of the project is to gain an understanding of the interaction between direct stimuli and the information transfer between individuals in schooling fish, and to understand how this affects their behaviour.
Tim Cato Netland, Technical Engineer at NTNU said "The marine acoustics team at NTNU are responsible for the acoustic modelling and instrumentation on the penned herring project. We have conducted several experiments in the Trondheim fjord, leading to an optimized underwater acoustic transmittance and transfer of data. The use of the Chelsea acoustic arrays has greatly simplified the testing process".
"With nearly 50 year's experience in the design and manufacture of underwater acoustic transducers including hydrophones, projectors, pingers and sidescan sonar arrays we are ideally placed to custom design systems to meet the expectations of the most demanding research programmes", said Chelsea's Paul Bolton.
For more information, please contact Ellen Keegan , Communications Manager, Chelsea Technologies Group, Tel +44 (0)20 8481 9019. Tim Cato Netland, Technical Engineer, Norwegian University of Science and Technology (NTNU). Web: www.chelsea.co.uk
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