Tunnel Location by Magnetometer, Active Seismic, and Radon Decay Methods

Abstract

This project investigated three methods of detecting mines or tunnels in granite: magnetic, seismic, and radioactive decay of radon. The magnetic, using a proton precession magnetometer, aims to detect tunnels from the magnetic materials (rails, roof bolts, wiring) these mines are expected to contain. The active seismic methods aims to detect tunnels by reflection or refraction of P- waves from the tunnel or by reverberations of the tunnel walls. The radon decay method aims to detect tunnelling activity by the extra release of radon gas freed into the atmosphere.

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Document Details

Document Type
Technical Report
Publication Date
Jun 18, 1975
Accession Number
ADA016370

Entities

People

  • W. C. Dean

Tags

DTIC Thesaurus Topics

  • Computers
  • Detection
  • Detectors
  • Diameters
  • Frequency
  • Geometry
  • Magnetic Fields
  • Magnetic Materials
  • Oscillation
  • Photographs
  • Recording Systems
  • Refraction
  • Resonant Frequency
  • Scalar Magnetometers
  • Seismographs
  • Travel Time
  • Waves

Readers

  • Plasma Physics / Magnetohydrodynamics
  • Seismology
  • Sensor Fusion and Tracking Systems.