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Systems and Sensors

Standard Sensors

Vehicle Sensors

  • Pressure: Paroscientific 8B7000-I, Digiquartz depth sensor, rated to 7,000e meters (23,000 feet) 
  • Doppler Velocity Logger (DVL): RDI, 300kHz 
  • Doppler Velocity Logger (DVL): Nortek, DVL500, 6,000 meters 
  • Attitude sensors (pitch, roll, heading-internal):  IXBLUE PHINS III 
  • Inertial navigation (internal): IXBLUE PHINS III 

Geophysical Sensors 

  • Multibeam mapping sonar: Kongsberg EM2040, 200Khz and 400Khz 
  • Edgetech 120/230/540kHz Side Scan 
  • Edgetech 4kHz to 20kHz = 4-24kHz chirp sub-bottom profiler 
  • Three high precision, digital, APS 3-axis fluxgate magnetometers; two mounted midship (port, starboard) in a horizontal gradient mode and a third mounted centrally within the vehicle above the other two in a vertical gradient mode. 

Oceanographic Sensors 

  • CTD sensor: Seabird 49 
  • Optical Backscatter (OBS): Seapoint Turbidity Meter 
  • Seafloor photography: Prosilica GE4000C Digital Still Camera (color still camera with strobe, rated to 6,000 meters) 
  • Oxygen Sensor: Aanderaa Optode 
  • NOAA ORP (oxidation-reduction potential) sensor 

Scientific Equipment Interfaces

Digital: RS232 standard ports available (300 through 115,200 Baud)
Power: 12, 24 and 48 VDC switched circuits available, custom voltages upon request
Data: Instruments can be synced to precision clock (e.g. all the main computer stack, imaging stack, multibeam, sidescan, PHINS gyro are synced)

** Potentially able to accommodate other digital/power formats and/or quantities.

All science gear connections must be worked out during the pre-cruise process.


Project-specific sensors interfaced to Sentry by PIs during previous cruises

  • DeepSea Power & Light camera and LEDs – MISO Facility, WHOI, USA
  • Eh electrode (redox sensor) – Dr. Koichi Nakamura, Japan
  • SUspended Particulate Rosette (SUPR) Biological Sampler – Dr. Chip Breier, WHOI, USA
  • Sensor for Aqueous Gases in the Environment (SAGE) methane sensor – Dr. Anna Michel and Jason Kapit, WHOI, USA
  • Sentry Precision Robotic Impeller Driven Sampler (SyPRID), Large volume, high-resolution, autonomous, deep ocean precision Plankton Sampler
  • TETHYS (in situ mass spectrometer) - Dr. Rich Camilli, WHOI, USA