Method for rapidly detecting subterranean tunnels by detecting a

Details Method for rapidly detecting subterranean tunnels by detecting a Method for rapidly detecting subterranean tunnels by detecting a

1981-05-18

1983-07-12

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

324345, G01V 308

Patent

active

043933505

ABSTRACT:
Method and apparatus for detecting tunnels, voids or other anomalies bene an area of the earth's surface wherein an oscillator couples a current into two conductors laid parallel to each other to generate two magnetic fields in the earth beneath the area. The magnetic field is measured along a line midway between the two horizontal conductors to detect for an increase in the measured field which is an indication of the presence of an anomaly.

REFERENCES:
patent: 1660774 (1928-02-01), Vos et al.
patent: 1678489 (1928-07-01), Sundberg
patent: 1960028 (1934-05-01), Ricker
patent: 2560834 (1951-07-01), Whitehead et al.
patent: 2730673 (1956-01-01), Jakosky
patent: 2731596 (1956-01-01), Wait et al.
patent: 4079309 (1978-03-01), Seeley

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