Wide bandwidth time-domain electromagnetic sensor for metal target classification

A portable, wide bandwidth, time-domain electromagnetic sensor system has been developed and used extensively to measure the eddy current time-decay response of a wide variety of metal targets. The sensor has demonstrated the ability to measure metal target decay times starting approximately 3 to 5 /spl mu/s after the transmitter current is turned off and target decay time constants as short as 1.4 /spl mu/s. The sensor has demonstrated the potential for detecting very low-metal content mines due to the void they create in some types of electrically lossy soils. The development of the sensor is described in detail, and time-decay data are shown for a variety of metal targets, including low metal antitank and antipersonnel mines.

[1]  John Goutsias.  Toward a unifying optimal approach to mine detection problems , 1996, Defense, Security, and Sensing.

[2]  A. Kaufman.  FREQUENCY AND TRANSIENT RESPONSES OF ELECTROMAGNETIC FIELDS CREATED BY CURRENTS IN CONFINED CONDUCTORS , 1978 .

[3]  Gary D. Sower,et al.  Detection and identification of mines from natural magnetic and electromagnetic resonances , 1995, Defense, Security, and Sensing.

[4]  I. J. Won,et al.  GEM‐3: A Monostatic Broadband Electromagnetic Induction Sensor , 1997 .

[5]  D. Marquardt.  An Algorithm for Least-Squares Estimation of Nonlinear Parameters , 1963 .

[6]  Yogadhish Das,et al.  A simple analysis of the electromagnetic response of buried conducting objects , 1991, IEEE Trans. Geosci. Remote. Sens..

[7]  Erol Gelenbe,et al.  Area-based results for mine detection , 2000, IEEE Trans. Geosci. Remote. Sens..

[8]  Y. Das,et al.  Analysis of an electromagnetic induction detector for real-time location of buried objects , 1990 .

[9]  Leslie M. Collins,et al.  An improved Bayesian decision theoretic approach for land mine detection , 1999, IEEE Trans. Geosci. Remote. Sens..

[10]  Lawrence Carin,et al.  Analysis of the electromagnetic inductive response of a void in a conducting-soil background , 2000, IEEE Trans. Geosci. Remote. Sens..

[11]  Colin King,et al.  Jane's Mines and Mine Clearance , 1998 .

[12]  Yogadhish Das,et al.  Time Domain Response of a Sphere in the Field of a Coil: Theory And Experiment , 1984, IEEE Transactions on Geoscience and Remote Sensing.

[13]  Donald D. Snyder,et al.  UXO CLASSIFICATION USING CHARACTERISTIC MODES OF THE BROADBAND ELECTROMAGNETIC INDUCTION RESPONSE , 2000 .

[14]  L. S. Riggs,et al.  Simulants (decoys) for low-metallic-content mines: theory and experimental results , 1999, Defense, Security, and Sensing.