×

ELECTROMAGNETIC IMAGING METHOD AND DEVICE

  • US 20090195244A1
  • Filed: 11/28/2006
  • Published: 08/06/2009
  • Est. Priority Date: 12/09/2005
  • Status: Active Grant
First Claim
Patent Images

1. An electromagnetic imaging method for electromagnetically measuring physical parameters of a pipe (CJ, CC) by means of a plurality of measuring arrangement (ZMA, MCMA, MonMa, ImMA) comprising a plurality of transmitter coil (ZTX, LFTX, DTX) and a plurality of receiver coil (ZRX1, ZR2, MRX, MC, PRX1, PRX2, PRX3, PRX4, PRX5, PRX6, PRX7, PRX8, PRX9, PRX10, PRX11, PRX12, PRX13, PRX14, PRX15, PRX16, PRX17, PRX18), the transmitter coils and receiver coils being associated so as to form the plurality of measuring arrangement, the plurality of measuring arrangement being adapted to be positioned into the pipe and displaced through the pipe, the physical parameters being measured for a plurality of position along the pipe, the method comprising the steps of:

  • a) determining a first value of an average ratio of magnetic permeability to electrical conductivity and a first value of an average inner diameter of the pipe (Z-MES),b) determining an average electromagnetic thickness of the pipe (MC-MES),c) determining a second value of the average ratio of magnetic permeability to electrical conductivity and a second value of the average inner diameter of the pipe (Mon-MES) according to excitation frequencies which are substantially lower than the excitation frequencies used to determine the first values (Z-MES),d) determining a first image (EMTIM) of a local electromagnetic thickness of the pipe and the pipe local defects (Im-MES),e) discriminating the local defects at an inside perimeter of the pipe from the local defects at an outside perimeter of the pipe (Dis-MES), andf) forming a corrected first image (IOFIM) of the pipe taking into account a position of the local defects.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×