Underground, time domain, electromagnetic reflectometry for digg

Details Underground, time domain, electromagnetic reflectometry for digg Underground, time domain, electromagnetic reflectometry for digg

1975-12-10

1977-02-01

Dixon, Harold A.

Communications: radio wave antennas

Antennas

Slot type

324 5, 343767, H01Q 1310

Patent

active

040064816

ABSTRACT:
An apparatus for detecting the presence of a buried, hidden object in the vicinity of a digging tool in order to prevent a human disaster and damage to utility lines or other buried structures. The apparatus includes an impulse generator and data processing means connected to a slot antenna formed in the tool of an earthmoving machine for radiating a burst of broad spectrum electromagnetic energy into the ground and for receiving and data processing reflected electromagnetic echoes. One antenna embodying the invention comprises a slot formed through a wall of a hydraulically driven shovel and filled with a ceramic absorber. The slot has four radially extending, orthogonally arranged loops having unclosed central portions of the loops joined end to end to form four apexes.

REFERENCES:
patent: 2570824 (1951-10-01), Lindenblad
patent: 3086204 (1963-04-01), Alford
patent: 3806795 (1974-04-01), Morey
patent: 3831173 (1974-08-01), Lerner

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