Open magnetic structure including pole pieces forming a V-shape threbetween for high homogeneity in an NMR device
First Claim
1. Open magnetic structure for producing an intense, stable magnetic field, which is controlled in amplitude and direction in a region adjacent to said structure, having at least one magnetic source (4) for producing said magnetic field, comprising one or more pole pieces (5, 6) associated with the magnetic source and having a shape designed so as to control the magnetic field produced, the said pole piece or pieces for controlling said magnetic field produced having a hollow portion constituting a generally V-shaped space, said region subject to the homogeneous magnetic field being positioned facing the opening of the V.
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Abstract
The disclosure relates to an open magnetic structure for producing an intense, stable magnetic field, which is amplitude and direction-controlled in a region adjacent to said structure, having at least one magnetic source (4) for producing said magnetic field, characterized in that it also comprises at least one pole piece (5, 6) associated with the magnetic source and having a shape designed so as to control the magnetic field produced.
Application to petroleum or oil research in drilled wells and to surface magnetic imaging.
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Citations
23 Claims
- 1. Open magnetic structure for producing an intense, stable magnetic field, which is controlled in amplitude and direction in a region adjacent to said structure, having at least one magnetic source (4) for producing said magnetic field, comprising one or more pole pieces (5, 6) associated with the magnetic source and having a shape designed so as to control the magnetic field produced, the said pole piece or pieces for controlling said magnetic field produced having a hollow portion constituting a generally V-shaped space, said region subject to the homogeneous magnetic field being positioned facing the opening of the V.
- 6. Device permitting the analysis of a given region adjacent to the device by means of magnetic field, comprising an open magnetic structure having at least one magnetic source (4) for producing said magnetic field, one or more pole pieces (5, 6) associated with the magnetic source and having a shape designed so as to control the magnetic field produced, the one or more pole pieces having a hollow portion constituting a generally V-shaped space for producing an intense, static, homogeneous magnetic field in said given region, and means (8, 20, 25, 37, 38, 39, 63, 87, 88) permitting the emission of an electromagnetic signal to said given region and the reception of the response signal from said given region to the emitted signal.
- 22. Device permitting the analysis of a given region by means of magnetic field, comprising an open magnetic structure having at least one magnetic source (4) for producing said magnetic field, one or more pole pieces (5, 6) associated with the magnetic source and having a shape designed so as to control the magnetic field produced, the one or more pole pieces having a hollow portion constituting a generally V-shaped space for producing an intense, static, homogeneous magnetic field in said given region, and means (8, 20, 25, 37, 38, 39, 63, 87, 88) comprising at least one antenna placed in the generally V-shaped space for permitting the emission of an electromagnetic signal to said given region and the reception of the response signal from said given region to the emitted signal, the at least one antenna comprising a channel-shaped portion closed at one of its ends by an element, to which is connected a strip, the free end of the channel and the free end of the strip forming the electrical connections of the antenna.
Specification