MAGRAY

MAGRAY

The SENSYS MAGRay® is a towed multi-channel magnetometer system for offshore surveys.

Overview

Sensor Technology:
Magnetometer
Application Type:
UXO Search, Geophysics and Geology, Offshore

Description

The SENSYS MAGRay® is a towed multi-channel magnetometer system for offshore surveys. It is suitable for all applications that aim for the precise search of ferromagnetic structures and objects under water. The system was designed and optimized for UXO search at depths of up to 100 meters at a speed of up to 7 knots. As a result the system is more efficient when covering wide survey areas.

The MAGRay® is based on a special carrier system, designed for maximum hydro-dynamic stability. Having a width of 4 meters, the system is equipped with up to 20 three axis Fluxgates probes of the type FGM3D UW in a two layer arrangement. Measuring with multiple installed sensors in two layers leads to a new dimension of data quality and data accuracy. The data is digitized in the carrier system and sent via an Ethernet connection to the vessel. The carrier system itself is towed by a hydrodynamic designed Remotely Operated Towed Vehicle (ROTV).

The combination of a satellite-based navigation system (GPS) on the vessel, a motion sensor on the ROTV and an underwater positioning system (USBL) on both allows the exact positioning of the ROTV, the carrier system and much more important – on every individual sensors.

Thus, precise location information can be acquired and stored together with the collected data from the magnetometer probes.

The ROTV works self-stabilizing, using its on-board sensors to detect distance to ground and motion (pitch and roll). It is able to follow the seabed autonomously, maintain a pre-set depth and avoid obstacles. In addition the ROTV used in the SENSYS MAGRay® is able to make course corrections sidewise to precisely follow a predefined track.

Specifications

Technical Data MAGRAY 
SensorsFGM3D/100 UW II
Measurement Range±100,000 nT (others available upon request)
Noise<15 pTrms/√ Hz @ f = 1 Hz
Sensitivity0.1V/µT
Resolution (in comb. with MX3D UW DAU)12pT
Bandwidth2,000 Hz standard, 4,000 Hz upon request
Length263 mm
Diameter45 mm
Power Supply±12….±15 V
Current Consumption± 26 mA
Cable Length to MX3D UW0.5 to 100 m
Weight (Air/Water/Salt Water)444 g/188 g/182 g
Data AcquisitionMX3D UW DAU
Number of Sensors1 to 5 units per digitizer, cascadable
Number of AUX Sensors2 (serial, GPS, altimeter, AHRS, etc.)
Sampling Range200 Hz to 10,000 Hz (others available upon request)
Resolution (ADC)24 bit
Input15x analogue channel, 1x RS232
Output10/100 mBits/s, full duplex
Start-up current2.5 A (restricted)
Power Supply10…32 VDC
Current consumption
(at 200 Hz sampling rate)
max. 10 W (including 5 sensors)
Ethernet Cable Lengthmax. 100 m (min. Cat6), extendible via DSL modem
Bandwidth requirementsapprox. 750 kbit/s (5 sensors, 1,000 Hz sampling rate)
ConnectorsSensors: Subconn MCBH8F, Voltage/LAN: DBH13M
DimensionsDiameter: 98 mm, Length (w/o connector): 324 mm,
Volume: 1,694 Liters
Weight (Air/Water/Salt Water)2,949.4 g /1,250 g/1,210 g
Options of Integrations
Sensor Position towards Carrier SystemVariable, minimum distance depending on carrier system
Integration of SensorsVariable adjustment
Distance of SensorsVariable, typical ≤ 0.5 m
ROTVEIVA Scanfish III ROTV
Required Interfaces (electronic)1x Ethernet connection, 1x 24VDC power supply
Required interfaces (mechanic)2x hocks/extrusions to connect sensor frame
Deck space
Storage of sensor frameat least 4x6m
Winch & top side unit2x2m
Cabin space1 work space with 2 screens

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