Subsurface TE scattering by tunnels using a surface line current
- Sandia Research Associates, Inc., Corrales, NM (USA)
A new technique for tunnel detection and location has recently been theoretically modeled and experimentally demonstrated. The objective of this research is to develop a general method for remotely detecting the presence of unauthorized tunneling activities using one or more boreholes and a surface source. A line current or dipole-dipole array, positioned on or near the surface of the earth, is used as the TE current source. Subsurface electric and magnetic field measurements are made in a borehole that is situated near a suspected tunnel location. The presence of a tunnel causes subsurface scattering of the field components created by the source. Both the electric and magnetic field strength and phase data is perturbed by the presence of a nearby tunnel. The scattered fields are observed on both sides of the tunnel relative to the source position. 1 fig.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- Sponsoring Organization:
- DOE/DP
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 7144473
- Report Number(s):
- SAND-89-2764C; CONF-900568--1; ON: DE90003839
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
422000 -- Engineering-- Mining & Underground Engineering-- (1980-)
58 GEOSCIENCES
580000* -- Geosciences
98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION
BOREHOLES
CAVITIES
DETECTION
ELECTRIC FIELDS
FIELD TESTS
MAGNETIC FIELDS
MINE SHAFTS
REMOTE SENSING
SHAFT EXCAVATIONS
TESTING