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Microdevice for measuring the electromagnetic characteristics of a medium including a shield

  • US 5,606,260 A
  • Filed: 12/07/1994
  • Issued: 02/25/1997
  • Est. Priority Date: 12/10/1993
  • Status: Expired due to Term
First Claim
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1. A microdevice for logging a medium in a bore hole comprising a transmitting coil and two receiving coils, an E-shaped, electrically insulating, soft magnetic material circuit adjacent the medium and having a median portion and three lateral branches perpendicular to said median portion and parallel to one another, the coils being wound onto said lateral branches in such a way that the receiving coils are located on adjacent lateral branches, said microdevice also comprising means for forming a shield between the transmitting coil and an area lacking interest in the medium.

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