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«TRITON» BASED UNDERWATER AND WELL MAGNETOMETER-GRADIOMETER

A sea bottom geomagnetism surveys at over 100 meters under water and deeper

Data acquisition unit of Triton magnetic field measurement system

System configuration examples:

Triton with 50-meter long cable and submarine gradiometer sensor

120-meter cable coil for trailing of submarine gradiometer sensor

Setup of transportation boxes for Triton instrumentation and cable coil

Triton with 40-meter long trailing cable and submarine gradiometer sensor

Triton with 100-meter long trailing cable and submarine gradiometer sensor

12-sensor gradiometer for small water and RTK base station

Basic 4-sensor gradiometer for small water

Automatic 24/7 magnetic field gradient monitoring system for seaship

Measured data illustrations:

Measured data opened in Google Earth app

Borehole magnetic field gradient sensor in use

Application:

- Automated real-time survey and magnetic field mapping
of geomagnetic anomalies on the land and in the sea;

- Geophysical well logging, real-time inspection and telemetry
of drilled or used oil and gas wells, mines and boreholes;

- Underwater archeology and geohysics.

Key features:

- High resolution from 1.0 nT to 0.1 nT (optionally);

- Wide ±70 000 nT or ±180 000 nT (optionally) measurement range;

- Up to 12x 3-component sensors can be used simultaneously;

- Sensors networking at distances up to 2 km and more;

- Can be integrated with ROV and optionally equipped by special channel
to transfer measured data in real time to the ROV controller on the ship;

- Anyone topology of magnetic field sensor can be chosen from
single fluxgate element to gradiometer or 3-component topology;

- Making possible to provide magnetic measurements down to 1 km under water;

- USB/RS-232 interface to connect custom GNSS receiver, or RTK system,
or sea radar (e.g. Trimble R8, Emlid Reach RS+, Lowrance Elite-7 Ti, etc.);

- Real-time color map, linear graph and digital indication of measurements;

- Being connected to the personal computer the Triton system works
like a standard USB flash drive, does not require any software driver;

- Output data format compatible with Surfer and Google Earth.

System architecture:

Magnetic field measurement system
Magnetic field sensitive element:	fluxgate, straight
Magnetic field sensor topologies provided by default:	1/2/3-component or gradiometer
Amount of 1/2/3-component or gradiometer magnetic field sensor maintained by system simultaneously:	1 – 12 or more (on special request)
Magnetic field components measurement range, nT:	±70000 or ±180000
Magnetic field gradient components measurement range, nT/m:	±140000 or ±360000
Magnetic field sensing resolution, nT:	1.0 or 0.1
Measurement data rate setting 3-component samples per second:	0.001 – 500
Maximum length of acquisition-to-sensor cable, m (depended on customer’s requirements):	2000
Coordinates measurement system
Measurement synchronization sources:	built-in timer external odometer
Coordinates measurement units: – built-in GNSS receiver – odometer on the base of incremental encoder – RTK system consists of receiver and base station	standard option option
RTK navigation systems supported:	GPS, GLONASS, GALILEO, BEIDOU
RTK base station coverage radius, km:	up to 40
External receiver connection (for third part manufacturers):	USB/RS-232 NMEA 0183 protocol 115200bps/8/1/no parity
Typical plane position measurement error, m: – built-in receiver – RTK system	±10 ±0,02
Storing and transferring data measured
Capacity of memory to save data measured:	8GB – 64GB (optional)
Personal computer communication:	USB port
Mechanical specs and power supply
Data acquisition unit dimensions (length × width × height, mm):	151×90×54
Magnetic field sensors dimensions (length × width × height, mm): – gradiometer – 3-component	1020×60×30 120×100×90
Magnetic field sensors water resistance, m:	40
RTK system components dimensions (length × width × height, mm): – receiver – base station (without tripod) – tripod for RTK base station – tripod when folded	120×65×55 170×85×55 1450×600×800 550×100×100
Data acquisition unit weight, g:	540
Magnetic field sensors weight, g: – gradiometer – 3-component	420 300
RTK system components weight, g: – receiver – base station (without tripod) – tripod for RTK base station	230 1300 1200
Power supply source:	lithium accumulator battery 3S2P
Supply current from fully-charged accumulator, mA:	800
Working temperature range, °С:	–20…+70