Depth Estimation of a Buried Conductive Sphere as a Model of Unexploded Ordnance Using Electromagnetic Induction Data

Document Type : Original Article

Abstract

In  this  paper,  a  novel  scheme  for  depth  estimation  of  a  buried  conductive  sphere  as  a  metallic  mine  using
electromagnetic  induction  (EMI)  data  is  presented.  In  electromagnetic  induction  method,  the  transmitter  coil
produces  the  incident  magnetic  and  electric fields that obey the Maxwell’s equations. In the receiver coil, the
received  response  is  created  in  two  modes.  Eddy-current  mode (
ec
V
) is  derived  from  the  perfect  conductor
placed in the shallow depth and another mode called current-channeling response  (
cc
V
) which depends on the
conductivity of the medium. As expected, these responses differ depending on the direction of the incident field
related to the receiver coil’s axis.  There  is a case that the transmitter coil’s axis is parallel to the ground
surface and only the eddy current response is measured in the receiver coil. By defining the maximum value of ,
ec
V
,the problem with depth determination transformed into the problem with finding a solution for a nonlinear
equation of the form
  0  z f
.The method is applied to synthetic data with and without random errors. In all of
the cases examined, the maximum error in depth is less than 6%. 

Keywords

References

 
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History

  • Receive Date: 03 April 2016
  • Revise Date: 06 March 2019
  • Accept Date: 19 September 2018

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