Investigation of EMI response for magnetically susceptible rough surfaces

I. Shamatava; B. E. Barrowes; F. Shubitidze; K. A. O'Neill; J. P. Fernández; K. Sun; K. D. Paulsen

doi:10.1117/12.668015

16 May 2006 Investigation of EMI response for magnetically susceptible rough surfaces

I. Shamatava, B. E. Barrowes, F. Shubitidze, K. A. O'Neill, J. P. Fernández, K. Sun, K. D. Paulsen

Proceedings Volume 6217, Detection and Remediation Technologies for Mines and Minelike Targets XI; 62170R (2006) https://doi.org/10.1117/12.668015
Event: Defense and Security Symposium, 2006, Orlando (Kissimmee), Florida, United States

Abstract

Magnetic and electromagnetic induction (EMI) sensing have been identified as two of most promising technologies for the detection and discrimination of subsurface metallic objects, particularly unexploded ordnances (UXO). In magnetic sensing, the principle of detection is that the sensor measures a distortion of the Earth's magnetic field caused by ferrous objects/ordnance. Similarly, in EMI, the sensors are detecting signals that are produced by induced and permanent magnetic polarizations. While these sensors can detect ferrous objects, they also find many other magnetic anomalies in the close vicinity. Soils, which contain small magnetic particles, called magnetically susceptible soils, can produce EMI responses, and therefore they can mask or modify the object's EMI response. These soils are a major source of false positives when searching for UXO using magnetic or EMI sensors. Studies show that in adverse areas up to 30% of identified electromagnetic (EM) anomalies are attributed to geology. Therefore, to enhance UXO detection as well as discrimination in geological environments the effects of the magnetic soils on the magnetic and EMI signal demands studies in detail. In this paper, the method of auxiliary sources (MAS) is applied to investigate the EMI response from magnetically susceptible rough surfaces. Several important physical phenomena such as the interaction between surface irregularities, modeled as multi hemitoroidal objects, surface roughness and antenna elevation effects are studied and documented. The numerical results are checked against available measurement data.

Citation Download Citation

I. Shamatava, B. E. Barrowes, F. Shubitidze, K. A. O'Neill, J. P. Fernández, K. Sun, and K. D. Paulsen "Investigation of EMI response for magnetically susceptible rough surfaces", Proc. SPIE 6217, Detection and Remediation Technologies for Mines and Minelike Targets XI, 62170R (16 May 2006); https://doi.org/10.1117/12.668015

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