Investigation of EMI sensor orientation and position efefcts on buried metalic target discrimination [efefcts read effects]

Near field ( ˜ 1 m) electromagnetic induction (EMI) sensing, from 10´s of Hz up to 100´s of kHz, has been successful in detecting subsurface metallic targets. However, the discrimination of buried unexploded ordinance (UXO) from innocuous objects still remains a challenging problem. The problem b more complicated in real field survey, when data are highly contaminated with noise and clutter. In EMI data the noise and clutter are generated from a sensor, surrounding media, sensor operation (motion and rotation) etc. Understanding and taking into account noises associated with the sensor motion and rotation are particularly important for identification and discrimination of actual UXO. To address these critical issues and to enhance of UXO identification, this paper investigates EMI scattering from a highly permeable and conducting objects subject to the state of the art of sensors using user friendly and freely available electromagnetic induction code based on the method of auxiliary sources [1]. At the end several numerical results are shown and analyzed to demonstrate the sensors rotation and shifting effects on EMI signals.