The G-882 is the industry standard marine magnetometer. Very high resolution Caesium Vapour performance has been incorporated onto a low cost, small size, system for professional surveys in shallow water. High sensitivity at fast sample rates of total field measurements are maintained for all applications.
Streamlined design for tow safety
Quick conversion from CG tow to nose tow, easy carry handles
Highest Sensitivity in the industry, 0.004nT/root Hz
Digital output, can be logged with MagLog™ software.
Low weight, can be man handled
New internal CM221 counter module, provides flash memory for storage of default parameter set by user.
New Echosounder/altimeter option
Zero phase lag on data
True amplitudes reported
Can be combined into gradient arrays, transverse, vertical or longitudinal
Data from multiple magnetometers can easily be concatenated into a single data stream
The fast sample rate and high sensitivity design of the G-882 lends itself to configuring into transverse gradient arrays. When taking measurement of a magnetic gradient component it is critical that the sensors measure both simultaneously and have the ability to measure different field values. If when passing over a target, the same field value is measured by both sensors at any point in time, then that gradient measurement is of little or no value in target discrimination, this can occur if;
The gradient array is too far away from the target, i.e. is too high in the water column.
The magnetometers being used have insufficient sensitivity to be able to discriminate the small changes in field value over the width of the array.
The gradiometer array is too small, so there is too little change in the magnetic field value over the width of the array for the magnetometers used to simultaneously measure a different field value.
The G-882 TVG frame ticks all of the boxes to help counter all 3 issues by being of a stable and hydro dynamic design to allow deeper towing, nearer to the sea bed where magnetic field gradients are greatest.
In shallow waters the G-882 can be deployed from a software Kevlar tow cable making deployment fast and simple. For greater deployment depths, or if deployed as an array on a TVG frame, a telemetry system can be utilised to run the system off a winch and wireline.
Wing attachment for marine magnetometers and Side Scan Sonar tow fish used to increase downward hydrodynamic force.
G-882 Pitch and Roll upgrade
Fitted within the body of the G-882, the pitch and roll data is concatenated with the total field measurement and provides important insights into the behaviour of the fish or TVG frame whilst preforming manoeuvres.
Soft tow cable
For fast easy deployment in shallow water a Kevlar enforced tow cable with 30VDC top end power supply can be used. Suitable for up to 300m cable length.
Motorised winches for deploying G-882 or Transverse gradiometer system on up to 6km of wire line.
An acoustic transponder which fits into the head of the G-882 tow fish to report the height of the fish above the sea bed in real-time.