Technique for separating electromagnetic refracted signals from

Details Technique for separating electromagnetic refracted signals from Technique for separating electromagnetic refracted signals from

1990-01-10

1991-11-19

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

324337, G01V 330

Patent

active

050669168

ABSTRACT:
In a logging tool which transmits electromagnetic radiation into adjacent formations, and including such tools which operate as low as 20 Khz (typical for induction logs) up to as high as the gigahertz range, an improved antenna system is set forth. The antenna preferably transmits a circular polarized signal so that reflected and refracted return constituents in the receiver signal can be sorted out. For intermediate frequencies, the antenna can be potted in a high dielectric constant material.

REFERENCES:
patent: 3582766 (1971-06-01), Iizuka
patent: 3944910 (1976-03-01), Rau
patent: 4383220 (1983-05-01), Baldwin
patent: 4600887 (1986-07-01), Baldwin et al.
patent: 4728897 (1988-03-01), Gunton
patent: 4812850 (1989-03-01), Gunton et al.

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