Fluxgate magnetometer

The fluxgate magnetometer, invented by Vacquier102 in the 1930s, consists of a small, magnetically susceptible core wrapped by two coils of wire. An AC electrical current passing through one coil drives a permeable... 

The District of Columbia used a Schonstedt GA 72 Cd fluxgate magnetometer and located about 12 anomalies in the area of the Rick Woods Pit. Most appeared to be single ordnance items but three or four resembled clusters of multiple shells. Previously, the District had flagged three such clusters using a Fisher M-Scope. Ironically, the spot that Woods indicated for his pit turned out to be directly uphill from the three previously identified anomalies. The District also reconfirmed these three anomalies using the Schonstedt device and interpreted them as probable multiple shell groups. 

Low-Sensitivity Magnetometer (LSM) The LSM is the most commonly used instrument for UXO location because it is inexpensive, effective, and easy to use. LSMs used for UXO detection typically are the dual-fluxgate type originally developed for the detection of underground utilities. Completely nonintrusive, LSMs do not emit any electromagnetic radiation, which is a potential source of initiation for some electrically initiated UXO. A minor disadvantage of LSMs is that they detect only ferrous items nonferrous UXO, however, is fairly rare. LSMs... 

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