Underground exploration apparatus

Details Underground exploration apparatus Underground exploration apparatus

2006-09-19

2006-09-19

Aurora, Reena (Department: 2862)

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

Using electrode arrays, circuits, structure, or supports

C324S357000

Reexamination Certificate

active

07109718

ABSTRACT:
A current to be applied to a ground is defined as the sum of two sinusoidal waves having first and second frequency components. A signal to be used at the time of synchronous detection is defined as a difference between the sinusoidal waves having the first and second frequency components. As a result, a substance in the ground, and the position and depth of the substance can be specified with high accuracy.

REFERENCES:
patent: 1808397 (1931-06-01), Billotte et al.
patent: 2005/0093548 (2005-05-01), Ueda et al.

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