Moored Data Acquisition Buoy
The Moored Data Acquisition Program is an example of a quick response program that delivered a moored data acquisition platform in a cost effective and timely manner. This was achieved by using Off-the-shelf hardware and SeaLandAire's experience in moored buoy design. The Moored Data Acquisition Platform's purpose is to monitor ambient noise and subsurface acoustic communication signals. It consists of a modified sonobuoy transmitter and hydrophone mounted to a ridged foam float. The float holds modules that contain rechargeable batteries, surface electronics and RF antenna for signal transmission to a shore station, and a navigation light. All modules are easily replaceable.
The Moored Data Acquisition Platform is secured to the ocean bottom by a fluke style anchor in 30 feet of water. SeaLandAire has experience with similar designs moored in over 500 ft of water. The system utilizes a hydrophone suspended off the bottom that isolates and protects the sensor to mitigate system and flow induced noise. Hardware is treated for use in the ocean environment. The system includes a battery charger, RF receiver and antenna for the shore station. This program was funded by the Naval Postgraduate School. The system was assembled and delivered in 60 days.
Requirements:
The buoy must be operational for a 2 week period with periodic replacement of rechargeable batteries. The buoy must measure ambient noise and pick up acoustic activity within the specified frequency range. This system will be moored in 30 feet of water. A buoy mounted navigation light is required to improve visibility at night.
Functional Operation:
The system is sized and designed for hand deployment and recovery from a small boat. The anchor and chain are designed to allow the buoy to hold its position during tidal changes and 2 knot currents. The batteries utilize wet mateable connectors that provide protection from splash and surface waves while providing a quick change capability for the power source and other modules.
Innovations:
The Moored Buoy provides quick turn and low cost design due to a number of features including the following.
- Pre-formed float blank that allows customization
- Off the Shelf Sonobuoy hardware with simple modifications that provides premium performance at minimal cost
- Off the Shelf mechanical hardware
- Off the Shelf energy package (Battery)
- Modular construction
- Customizable data acquisition platform
- Low system noise
- Modular battery pack that allows use of different chemistry batteries as required. SeaLandAire has experience with Lead Acid, NiCad, Lithium Ion, and Alkaline chemistries
