Method and apparatus for detecting and mapping subsurface anomalies
US9891339B2 · kind B2 · utility
Inventor
Key dates
| Filing date | May 12, 2014 |
| Grant date | Feb 13, 2018 |
| Priority date | — |
| Expiry date | May 24, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2003/086
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for estimating at least one geophysical property is disclosed. The method includes using a plurality of transmitter electrodes distributed in a conductive medium, periodically passing rectangular current impulses through the media; collecting a sequence of sounding data between each of the impulses with a receiver electrode disposed between the plurality, determining a first difference and a second difference of the electric potential between points of the collected data; when each of the transmitters is excited, acquiring a focused measurement by simultaneously calculating a combination of at least one orthogonally weighted measurement and at least one axially weighted measurement obtained by the receiver, wherein the weighting is obtained from a condition of equipotentiality in four outer electrodes of the receiver; and, applying a time-differentiation technique to obtain deep measurements that exhibit low noise contribution from shallow features. An apparatus is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.