Method for locating underground anomalies by diffraction of elec

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage

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G01V 312, G01V 318

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active

041616871

ABSTRACT:
Underground anomalies or discontinuities, such as holes, tunnels, and caverns, are located by lowering an electromagnetic signal transmitting antenna down one borehole and a receiving antenna down another, the ground to be surveyed for anomalies being situated between the boreholes. Electronic transmitting and receiving equipment associated with the antennas is activated and the antennas are lowered in unison at the same rate down their respective boreholes a plurality of times, each time with the receiving antenna at a different level with respect to the transmitting antenna. The transmitted electromagnetic waves diffract at each edge of an anomaly. This causes minimal signal reception at the receiving antenna. Triangulation of the straight lines between the antennas for the depths at which the signal minimums are detected precisely locates the anomaly. Alternatively, phase shifts of the transmitted waves may be detected to locate an anomaly, the phase shift being distinctive for the waves directed at the anomaly.

REFERENCES:
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patent: 2659882 (1953-11-01), Barret
patent: 2901689 (1959-08-01), Barret et al.
patent: 3350634 (1967-10-01), Hoehn
Grubb et al., "Borehole Measurements . . . in the 300-KHz to 25 MHz Frequency Range"; Radio Science, vol. 11, No. 4, pp. 275-283, Apr. 1976.
Laine, Edwin F., Short, Active, High-Frequency Antenna as an E-Field Probe, ERDA Tech. Report No. UCRL-77856, Abstract/Summary, pp. 1-7, Apr. 13, 1976.
Lytle et al., "Determination of the In Situ High Frequency Properties of Pemafrost Rock", Radio Science, vol. 11, No. 4, pp. 285-293, Apr. 1976.

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