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A Neutrally Buoyant Suspension System for Underwater Instruments.
WOODS HOLE OCEANOGRAPHIC INSTITUTION MASS
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The report describes a new and inexpensive system for quiet suspension of a hydrophone, hydrophone array or other instruments from a rolling or pitching surface vessel. The system is designed for operations where the ship is anchored, hove-to and drifting, or underway at low speed. This neutrally buoyant suspension assumes a streamlined configuration for fast lowering over the side but automatically deploys itself at any desired depth when the winch is stopped. Sea trials involving acoustic transmission experiments and ambient noise measurements have been conducted over the past two years in sea states ranging from 1 to 5. The deep gear is also adaptable to suspension from a surface platform or buoy, and should operate effectively in these applications as well. Author Modified Abstract
APPROVED FOR PUBLIC RELEASE