ALLTEM Multi-Axis Electromagnetic Induction System Demonstration and Validation

Abstract

Unexploded ordnance (UXO) is one of the most pressing problems facing the U.S. Department of Defense (DoD) and other government agencies that have lands that were once used for military training and are now closed or closing and being transferred to civilian or non-DoD government use. Cleanup of all UXO-contaminated lands using existing methods would be prohibitively expensive, so a great deal of effort is being directed to finding better ways to detect, locate and identify buried UXO. It is not sufficient to merely detect buried metal objects because many of these objects are not UXO and pose no hazards. In many cases of range cleanup, 70% or more of the cost consists of locating and removing harmless metal including soda cans, broken parts from agricultural equipment, and fragments of ordnance that exploded as designed. Among the primary geophysical methods for detection and classification are various time and frequency domain electromagnetic induction (EMI) systems and magnetometers. This project follows Strategic Environmental Research and Development Program (SERDP) Project MM-1328. In that project one prototype magnetic system, the Tensor Magnetic Gradiometer System (TMGS) and two prototype EMI instruments, the Very Early Time-domain ElectroMagnetic (VETEM) system and the High Frequency Sounder, were evaluated. Subsequent to the evaluations, it was decided that a new multi-axis EMI system should be designed, built, and tested. Specifically, we recommended that we should build a multiple component, On-Time Time-Domain Electromagnetic system (ALLTEM) using a triangle current wave excitation and analyze the data by time-domain methods. This system is able to record at much later times the earth s electrical conductivity response, which has decayed to essentially zero.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 2012
Accession Number
ADA571851

Entities

Organizations

  • Environmental Security Technology Certification Program

Tags

Communities of Interest

  • Energy and Power Technologies
  • Sensors
  • Weapons Technologies

DTIC Thesaurus Topics

  • Data Acquisition
  • Data Analysis
  • Data Processing
  • Department Of Defense
  • Detection
  • Detectors
  • Electromagnetic Induction
  • Electronic Mail
  • Explosives
  • Global Positioning Systems
  • Grids
  • Induction Systems
  • Information Science
  • Military Training
  • Munitions
  • Surveys
  • Unexploded Ammunition

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Environmental Engineering.
  • Optical Fiber Sensing and Electromagnetic Propagation.