Geometrics G-882TVG Cesium Magnetometer/Transverse Gradiometer

Rent Geometrics G-882TVG Cesium Magnetometer/Transverse Gradiometer
Request Quote Print Page
The Geometrics G-882TVG Cesium Magnetometer/Transverse Gradiometer mates the well- proven high-performance cesium sensor with dual high sensitivity and high speed CM-221 Larmor Counters. This advanced integrated magnetometer system provides unmatched versatility in performance, with a wide sensor separation for maximum target detection efficiency and survey cost effectiveness.

The system comprises a transverse wing and two G-882 Cesium Vapor magnetometer fish with stabilizer weights and fins. Tow cables may be up to 150m in length with standard power supply or up to 700m with a high capacity voltage sense supply. Depth sensors provide gradiometer attitude and depth information to the operator depth and an echo-sounder altimeter provides height above sea floor for proper system flight control.

Dual sensors are synchronized to 1ms sampling and data is transmitted via RS-232 for recording by any standard PC computer using our industry standard MagLogLite software. High sample and data transmission rates (up to 40 samples per second) are standard.

The G-882G provides sensitivities of 0.004 nT/√Hz RMS or approximately 0.01 nT P−P at 10 Hz, selectable via software command for detection of the smallest anomalies. MagLog software computes the transverse difference for display and analysis in real time, using the customer supplied GPS for interpolation and target positioning. The system's high performance is excellent for the detection and delineation of cables, pipelines, environmental, archaeological or military UXO and EOD targets.


Operating Principle: Self-oscillating split-beam cesium vapor (non-radioactive)
Operating Range: 20,000 to 100,000 nT
Operating Zones: The earth’s field vector should be at an angle greater than 10°from the sensor’s equator and greater than 10° from the sensor’s long axis. Automatic hemisphere switching.
Sensitivity with CM-221 Counter: <0.004nT/sq-rt-Hz RMS. Typically 0.01 nT P-P at a 0.1second (10 Hz) sample rate (90% of all readings falling within the P-P envelope)
Sample Rate: Up to 40Hz in 100ms increments
Heading Error: <0.25 nT over entire 360° equatorial and polar spins
Absolute Accuracy: <3 nT throughout range
Output: Cycle of Larmor frequency = 3.498572 Hz/nT, RS-232 data at 115K baud, concatenated data streams from 2 to 8 sensors depending on sample rate