Patent ID: 8432167
Filing Date: 2013-04-30
Classification: G01V

Abstract:
1. An electromagnetic transient apparatus configured to generate a transient magnetic field in a material to be analyzed, comprising: a magnetic core having magnetic hysteresis and configured to generate the transient magnetic field when a pulsed current through a coil proximate to the magnetic core reverses a state of magnetization of the magnetic core, wherein the magnetic core is made of at least one permeable magnetic material, the at least one material and dimensions of the magnetic core being selected to make a residual magnetization of the core substantially equal to a saturation magnetization of the core and the at least one magnetic material having a substantially rectangular hysteresis loop when measured in a closed magnetic loop configuration; and an antenna configured to receive signals from the material to be analyzed, the signals caused by the reversal of the state of magnetization of the magnetic core.