Method and apparatus for the location of remote conductors by analysis of signals induced in an antenna array
US5684403A · kind A · utility
Inventor
Key dates
| Filing date | Dec 15, 1995 |
| Grant date | Nov 4, 1997 |
| Priority date | — |
| Expiry date | Dec 15, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/081
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An antenna array has three horizontal coils (A,B,C) with equal spacings s, and two coplanar vertical coils (D,E) with a horizontal spacing 2f. When it is located over one or more current-bearing buried conductors, signal currents (A,B,C,D,E) are induced in the coils. The difference value D-E is measured and compared with a value "D-E" calculated from the equations: EQU "(D-E)"=2f/("d".sup.2 +f.sup.2) EQU "d"=2s(B-C)/A-B)-(B-C)!. Identity indicates that the signal source is a single conductor. A larger calculated value indicates plural sources with mainly vertical separation. A small calculated value indicates plural sources with mainly horizontal separation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.