Patent · US Expired

Method and apparatus for electromagnetically surveying a remote elongate conductor employing a detector assembly having plural electromagnetic transducer assemblies

US4672321A · kind A · utility

43Cited by
11References
8Claims
0Family size

Inventor

Key dates

Filing dateFeb 14, 1984
Grant dateJun 9, 1987
Priority date—
Expiry dateFeb 14, 2004

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01V3/06
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

Apparatus for locating or monitoring the condition of an inaccessible conductor comprises an antenna for receiving electrical signals due to an alternating current in the conductor. The antenna comprises at least two transducer assemblies each comprising two horizontal, preferably mutually perpendicular, transducers (preferably ferrite-cored coils). The signals induced in the transudcers can be processed to give information about the current in the conductor (indicative of its condition) or its depth, independently of the antenna orientation. Use of more assemblies can give better sensitivity. Assemblies including a vertical transducer can avoid the need for the antenna to be over the conductor.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.