Magnetometers
Marine Magnetics Explorer Gradiometer
Absolute Accuracy 0.20 nanotesla
Sensor Sensitivity 0.02 nanotesla
Counter Sensitivity 0.001 nanotesla
Resolution 0.001 nanotesla
The Marine Magnetics Explorer Gradiometer is a high sensitivity caesium gradiometer system, providing unmatched ferrous object detection capabilities for shallow water marine applications.
The system comprises tow Marine Magnetics Seaspy magnetometers in a semi-buoyant frame.The system operates by generating comparative measurements of magnetic field; when the sensor is relatively close to a ferrous source, both the gradient and total field influences are strong. As the sensor moves away, the gradient disappears more quickly than the total field influence.
This relationship becomes useful when trying to distinguish between magnetic bodies of different sizes and signatures, since a large magnetic body's total field influence may extend for a large distance, obscuring smaller anomalies within it. The same body's magnetic gradient will extend for a significantly smaller distance, allowing better resolution of the smaller anomalies.
