Frequency filtering and adjustment of electromagnetically received signals from antennas
US8829907B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 2010 |
| Grant date | Sep 9, 2014 |
| Priority date | — |
| Expiry date | Oct 18, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/30
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for estimating a property of an earth formation penetrated by a borehole, the apparatus having: a carrier configured to be conveyed through the borehole; a transmitter disposed at the carrier and configured to transmit electromagnetic energy at a first frequency into the formation; a first antenna disposed at the carrier and configured to receive electromagnetic signals from the formation as a result of the transmitted electromagnetic energy interacting with the formation; and an active filter coupled to the antenna and configured to filter electromagnetic signals received by the antenna to let the electromagnetic signals at the first frequency pass for processing to estimate the property.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.