Patent US4460752A successfully refreshed from Google Patents.
Patent EP0932055A2 successfully refreshed from Google Patents.
EP0932055A2
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EP
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NMR sensor
Assignee: Oxford Instruments Superconductivity Ltd
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Filing: 1999-01-20
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Granted: —
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Expires: 2019-01-20
Abstract
Abstract An NMR sensor comprising a magnetic field generating assembly (3,4); an RF antenna (5); and a plurality of ferrite members (9,10) which couple with RF magnetic fields transmitted or received by the RF antenna. The sensor is typically used in apparatus for performing borehole measurements.
Inventors
- 👤 Robert Andrew Slade
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 22:44
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/32; G01N; G01N24/00; G01N24/08; G01N24/081
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
31 words
An NMR sensor comprising a magnetic field generating
assembly; an RF antenna; and a plurality of ferrite members
which couple with RF magnetic fields transmitted or
received by the RF antenna.
Claim 2
Dependent Claim
34 words
A sensor according to claim 1, wherein the maximum
dimension of each of the ferrite members is less than a
half wavelength of electromagnetic waves within the ferrite
material at the NMR operating frequency.
Claim 3
Dependent Claim
23 words
A sensor according to claim 1 or claim 2, wherein the
RF antenna comprises a coil which is wound over the ferrite
members.
Claim 4
Dependent Claim
40 words
A sensor according to any of the preceding claims
wherein the magnetic field generating assembly comprises a
pair of axially spaced main magnets having opposite pole
orientation, and the RF antenna is located axially between
the pair of main magnets.
Claim 5
Dependent Claim
35 words
A sensor according to any of the preceding claims
wherein the sensor is arranged to perform measurements on
an external sample outside the space envelope of the
magnetic field generating apparatus and the RF antenna.
Claim 6
Dependent Claim
35 words
A sensor according to any of the preceding claims
wherein the magnetic field generating assembly has a radial
gradient which is minimised with respect to variation in
the size and position of the ferrite members.
Claim 7
Dependent Claim
16 words
Apparatus for performing borehole measurements
comprising an NMR sensor according to any of the preceding
claims.
Claim 8
Dependent Claim
24 words
Apparatus according to claim 7, wherein the ferrite
members are mounted on an elongate axially extending
support, and the ferrite members are axially spaced.
Claim 9
Dependent Claim
37 words
Apparatus according to claim 7 or claim 8, wherein the
ferrite members are mounted on an elongate axially
extending support, and the ferrite members are arranged
around the axis of the support at the same axial position.
Claim 10
Dependent Claim
71 words
Apparatus according to claim 8 or claim 9, wherein the
apparatus further comprises a recess formed in the support,
the recess having a base and a pair of axially spaced
shoulders, wherein the ferrite members are located at least
partially in the recess; and one or more strengthening
members which are arranged between the ferrite members,
coupled to the base of the recess, and coupled to each
shoulder of the recess.
Claim 11
Dependent Claim
23 words
Apparatus according to claim 10, wherein the
strengthening member(s) have a maximum dimension which is
substantially parallel with the axis of the tool.
Claim 12
Dependent Claim
20 words
Apparatus according to claim 10 or claim 11, wherein
the strengthening member(s) is/are fabricated from a
material comprising a metal.
Claim 13
Dependent Claim
20 words
Apparatus according to any of claims 10 to 12, wherein
the strengthening member(s) and the support comprise a
unitary member.
Claim 14
Dependent Claim
22 words
Apparatus according to any of claims 7 to 13 further
comprising a drill head mounted at an axial end of the
support.
References Cited (Backward Citations)
No citation records indexed.
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