Potential Field Techniques
Magnetic Profiling
Outline
Magnetic profiling is a passive method that involves measurement of localised variations in the amplitude of the geomagnetic field resulting from buried ferrous targets, such as underground storage tanks and pipes, and variations in the magnetic susceptibility of near surface materials. The amplitude and shape of the anomaly caused by buried ferrous objects will depend on the target's shape, orientation and susceptibility. Modern magnetometers are capable of measuring the field to 1 part in 5 million (0.01nT), enabling detection of small scale ferrous targets, such as unexploded ordnance, and subtle features, such as those resulting from archaeological activity (e.g. walls/kilns). Up to 10 readings can be acquired per second enabling rapid reconnaissance of a site.
