Seafloor gravimeters

ROVDOG

Seafloor gravimeters and pressure sensors in a common instrument frame with external power and communication cable.

ROVDOG III.5 System Features

5 pressure cylinders in a frame
Each cylinder contains a gravimeter, a water pressure sensor, gimbals and electronics
Gravimeters are of type Scintrex CG-5 or CG-6
Water pressure sensors are of type Paroscientific Digiquartz 31K, 42K or higher depth rating
Cable to ROV provides power and two-way communication
Operator on the vessel controls data acquisition and recording

Benefits of smaller units and increased number of sensors compared to older ROVDOG versions

Higher precision with the same number of measurements
- Gravity drift errors are effectively reduced by averaging
Similar precision with fewer measurements
- Resulting in shorter survey time and lower cost

ROVDOG III.5 specifications

Frame height 850 mm
Frame diameter 692 mm
Weight in air 120 kg
Weight in water 15 kg (adjustable)
No. of units in the frame 5
Unit height 557 mm
Unit diameter 203 mm
Gravimeters of type Scintrex CG-5 or CG-6
Repeatability (Scintrex statement): 5 µGal for single sensors
Repeatability (Quad statement): <1 µGal for 5 sensors (standard deviation)
Depth rating of cylinders 1500 m or 3000 m
Depth rating of pressure sensors 680 m, 1370 m, 2060 m or 2750 m
Sampling interval 6 Hz / 10 Hz
Integration length 1/6 s – 1/10 s
Memory capacity: No internal memory, continuous recording on the vessel
Battery life: Backup batter > 2 hours

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