With three orthogonal receivers each simultaneously measuring the complete transient response associated with each of three orthogonal transmitters, the EM63-3D-MK2 represents our most advanced instrumentation for the characterization and classification of near-surface metallic objects.

Any one transmitter coil generates a pulsed primary magnetic field that induces eddy currents in any nearby metallic objects. The decay of these eddy currents with time generates a secondary magnetic field with a specific rate of decay that is determined uniquely by the object characteristics: size, shape, orientation, composition, etc. Measurement of the secondary field decay (the transient response), therefore, will provide important information toward a more complete characterization and classification of all objects; the identification and rejection of the characteristic response from certain geologic materials (e.g. magnetite); and, for applications associated with the interrogation of unexploded ordnance and similar items of explosive concern, an important reduction in target selection error (the “false positive” rate). And with three orthogonal transmitter coils, the EM63-3D-MK2 provides the further benefits associated with the illumination of an object from multiple directions.

The EM63-3D-MK2 accurately measures the complete transient response over a wide dynamic range of time: measurements are recorded at 26 geometrically spaced gates, covering a time range from 180μs to 25ms. Continuous, high-volume data acquisition in walking mode is supported by the Panasonic Toughbook field computer, which can simultaneously record both EM and GPS data.

In the event that the full capabilities of the EM63-3D-MK2 are not required, the EM63-MK2, with three orthogonal receiver coils, includes a single vertical-dipole transmitter only.