Title: Method and means for investigating the distribution of electrical conductivity in the ground

Abstract: The invention relates to the obtaining of highly diagnostic information concerning the distribution of electrical conductivity (resistivity) in the ground between two points by creating an electromagnetic field whose frequency can be varied over a desired range at one of the points and detecting and comparing at the other of the points, at a plurality of transmitted frequencies, components of the magnetic and/or electric field which are in phase and out of phase with a reference signal derived electromagnetically at the second point from the transmitted field whereby no cable or other physical connection between the two points are required. The invention also relates to apparatus by means of which the electromagnetic field is created, the reference signal electromagnetically derived and the in phase and out of phase magnetic and/or electric field components detected.

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Inventors: Ghosh, Mrinal K. (Scarborough, CA, US)
Hallof, Philip G. (Don Mills, CA, US)

Application Number: 420019
Filing Date: 1973-11-29
Publication_date: 1976-02-03
Assignee: McPhar Geophysics Limited (Don Mills, CA)
Primary Class(es): 324/335
Other Classes:
US Patent Ref:

1718352	Jun, 1929	Guilford	324/6.
1843407	Feb, 1932	Sundberg	324/6.
2731596	Jan, 1956	Wait et al.	324/6.
2903642	Sep, 1959	Seigel	324/6.
3015060	Dec, 1961	McLaughlin et al.	324/6.
3123767	Mar, 1964	Ghose	324/6.
3168694	Feb, 1965	Slattery	324/6.
3259836	Jul, 1966	Oshry	324/6.
3548299	Dec, 1970	Duroux et al.	324/6.
3551798	Dec, 1970	Enenshtein et al.	324/6.
3594633	Jul, 1971	Barringer	324/6.
3614600	Oct, 1971	Ronka	324/6.
3763419	Oct, 1973	Barringer	324/6.

Other Refs: 795,919

Oct, 1968	CA

Primary Examiner: Strecker, Gerard R.
Assistant Examiner:
Attorney: