Idaho Springs tunnel detection experiments - dipole source and borehole field measurements
- Sandia National Labs., Albuquerque, NM (USA)
- Sandia Research Associates, Inc., Corrales, NM (USA)
A new technique for tunnel detection and location has been experimentally demonstrated. The objective of this work is to develop a general method for remotely sensing the presence of tunneling activities using one or more boreholes and a surface source. A dipole-dipole array, positioned on the surface of the earth, is used as the Transverse Electric (TE) current source. Subsurface electric and magnetic field measurements are made in boreholes that are situated near a 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 is perturbed by the presence of a nearby tunnel. The scattered fields were measured on both sides of the tunnel relative to the source position.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (United States)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 721049
- Report Number(s):
- SAND--90-1462; ON: TI91020224
- Country of Publication:
- United States
- Language:
- English
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