Method for determining changes in earth resistivity by measuring

Details Method for determining changes in earth resistivity by measuring Method for determining changes in earth resistivity by measuring

1976-09-03

1978-03-14

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 8, G01V 308

Patent

active

040793095

ABSTRACT:
Method and apparatus for detecting tunnels beneath an area of the earth's rface wherein an oscillator couples a current into a linear conductor at the earth's surface to generate a magnetic field in the earth beneath the area. Phase angle measuring means measures phase difference between the vertical and horizontal components of the magnetic field at selected points along a line parallel to the linear conductor to detect abrupt changes in earth resistivity, changes in resistivity indicating the presence and horizontal position of a tunnel.

REFERENCES:
patent: 1672328 (1928-06-01), Loth
patent: 1718352 (1929-06-01), Guilford
patent: 1843407 (1932-02-01), Sundberg
patent: 2730673 (1956-01-01), Jakosky
patent: 2731596 (1956-01-01), Wait et al.
patent: 3594633 (1971-07-01), Barringer
patent: 3984758 (1976-10-01), Millon

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