The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 06, 1999
Filed:
May. 15, 1997
Roy K Warren, Houston, TX (US);
Jesse G Robison, Missouri City, TX (US);
Other;
Abstract
The present invention involves service induction techniques to produce two-dimensional spatially continuous imaging of subsurface conditions for interpreting and verifying three-dimensional, spatially continuous imaging of subsurface conditions or for planning a survey using three-dimensional, spatially continuous imaging. A transmitter coil is placed in the surface of the earth with the axis of the core perpendicular to the surface of the earth. A surface probe including a horizontal coil and a vertical coil is located along the surface of the earth at a fixed offset from the transmitter. Application of an alternating current to a transmitter coil generates a primary magnetic field adjacent to the transmitter. Should the lines of force in the primary magnetic field intercept an intervening layer or area of contrasting resistivity or conductivity, an electromagnetic force is produced within the area of contrasting resistivity causing the contrasting layer to generate a secondary magnetic field between the surface probe and the area of contrasting resistivity. Both the primary and secondary coils induce corresponding signals in the horizontal and vertical coils of the surface probe. The transmitter coil is placed in a multiplicity of positions on the surface of the area being investigated, with the induced signals being recorded for each transmitter coil location until the surface induction survey is completed. From the secondary induction signals, resistivity measurement is indicative of the resistivity of the contrasting layers of pollution within the survey area are computed. The resistives are then contoured, producing two dimensional displays of distributions of pollutants within the survey area. The survey induction techniques may be conducted along with vertical induction techniques in order to interpret and verify vertical induction data or may be conducted separately before vertical induction techniques in order to plan a vertical induction survey.