Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
1978-11-07
1981-01-13
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
343 5NA, G01V 317, G01V 312
Patent
active
042451914
ABSTRACT:
A method and apparatus is described comprising a transmitter for transmitting an unmodulated carrier of selected wave length into the ground and a receiver adapted to receive reflected signals. Circuitry is described for producing narrow pulses from the transmitted and received signals for displaying them on an oscilloscope and on a plotter. The display on the oscilloscope is rotated through 90.degree. from the conventional display so that the pulses corresponding to the transmitted and reflected signals appear as horizontal bars spaced apart vertically by distances which correspond to the depth of the inclusions below the surface.
The wave length is selected to be at least four times the anticipated depth of the inclusions.
The apparatus is described as being incorporated into a motor vehicle such as a Land Rover with the transmitting antenna mounted at the front and the receiving antenna at the rear of the vehicle. The apparatus is most conveniently situated in place of the co-driver's seat for operation by an operator sitting in the rear of the vehicle.
Decoupling between transmitting and receiving antennae is partially achieved due to the rotation through 90.degree. of the polarity of the reflected wave relative to the transmitted wave.
REFERENCES:
patent: 2172688 (1939-09-01), Barret
patent: 2766422 (1956-10-01), Carbonetto
patent: 2919397 (1959-12-01), Morley
patent: 2994031 (1961-07-01), Slattery
patent: 3168694 (1965-02-01), Slattery
patent: 3392384 (1968-07-01), Wesch
patent: 3440523 (1969-04-01), Gabillard
patent: 3634753 (1972-01-01), Unterberger
patent: 3665466 (1972-05-01), Hibbard
patent: 3745575 (1973-07-01), Kikuchi
patent: 3836960 (1974-09-01), Gehman et al.
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