The Bluefin Spray Glider is a deep-diving, buoyancy-driven autonomous underwater vehicle. The Spray collects water column data profiles using a pumped, conductivity-temperature-depth (CTD) sensor and other instruments. Deployments of up to 6 months can be achieved with a single set of batteries.
EFFICIENT & ELEGANT – The Spray varies its buoyancy using a hydraulic pump and changes its attitude by shifting internal battery packs for pitch and roll. A set of passive wings with embedded antennas provides communications and facilitates forward motion through the water. This approach enables the vehicle to glide up and down along a saw-tooth dive profile using a fraction of the energy used to drive propellers in traditional AUVs.
LONG ENDURANCE – The Spray’s efficient design allows for long-endurance missions of up to six months or 4,800 kilometers, making persistent monitoring over large areas or long distances possible.
DEEP RATED – The Spray is rated to 1,500 meters, making it ideal for open ocean applications, while still able to profile shallow depths.
PUMPED CTD – The standard oceanographic-grade CTD sensor actively pumps seawater through the instrument, significantly reducing biofouling and extending vehicle endurance, especially in warmer climates where biogrowth is more prevalent.
The Spray Glider was originally developed at Scripps Institution of Oceanography (SIO) under Dr. Russ Davis. The technology was licensed in 2004 and has since been modified.
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|Diameter||8 in (20 cm)|
|Length||84 in (213 cm)|
|Weight (Dry)||115 lb (52 kg)|
|Buoyancy||0.9 lb (0.4 kg) net positive|
|Volume Change||27 oz (700 cc)|
|Lift Points||1 (located in tail)|
|Depth Rating||4,921 ft (1,500 m)|
|Endurance / Range||Up to 6 months/4,800 km
with standard payload
|Speed||Variable, 19-35 cm/sec typical|
|Energy||17.5 MJ of total energy
Lithium primary batteries
|Propulsion||Hydraulic buoyancy pump|
|Navigation||Compass, GPS and depth sensor
Waypoint boundary navigation
|Antenna||GPS/Iridium integrated in both wings
Argos integrated in tail
|Communications||Iridium SBD and serial via shore cable|
|Safety Systems||Argos, dropweight and independent watchdog|
|Software||HyperTerminal, a menu-driven software tool|
|Data Management||256 MB flash card|
|Sensor Channels||1 serial and 2 analog (after standard CTD)|
|Sensors||Sea-Bird conductivity-temperature-depth (CTD)
Dissolved oxygen (optional)
|Behaviors||Loitering, boxes and virtual mooring|