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US5311129A
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Local magnetic field measurement apparatus having gradiometers arranged on non-parallel, non-orthogonal surfaces
Assignee: STL Systemtechnik Ludwig GmbH
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Filing: 1992-08-03
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Granted: 1994-05-10
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Expires: 2012-08-03
Abstract
Abstract For the determination of all linearly independent components of an Nth order gradient tensor of a magnetic field, at least 3+2N planar gradiometers of the Nth order are arranged on at least 3 non-parallel and non-orthogonal surfaces. As a result, three-dimensional coil structures are not necessary.
Inventors
- 👤 Wolfgang Ludwig
- 👤 Wolfgang Eschner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:14
CPC Classifications
H; H02; H02N; H02N1/00; H02N1/002; H02N1/004; A; A61; A61B; A61B5/00; A61B5/06; A61B5/061; A61B5/062; G; G01; G01R; G01R33/00; G01R33/02; G01R33/022; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/842; Y10S505/843; Y10S505/845; Y10S505/846
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
48 words
An arrangement for determining all linearly independent components of an Nth order gradient tensor of a magnetic field, with N≧1, comprising: at least planar gradiometers of the Nth order arranged on at least 3 non-parallel and non-orthogonal surfaces, said surfaces being arranged in close proximity to each other.
Claim 2
Dependent Claim
48 words
An arrangement for determining all linearly independent components of an Nth order gradient tensor of a magnetic field, with N≧1, comprising: at least planar gradiometers of the Nth order arranged on at least 3 non-parallel and non-orthogonal surfaces, said surfaces being arranged in close proximity to each other.
Claim 3
Dependent Claim
24 words
An arrangement according to claim 1, wherein the gradiometers are arranged on surfaces of a polyhedron with at least three non-parallel and non-orthogonal surfaces.
Claim 4
Dependent Claim
26 words
Arrangement according to, claim 2 wherein said polyhedron is one of: a pyramid with at least four lateral surfaces, an octahedron, a dodecahedron and an icosahedron.
Claim 5
Dependent Claim
23 words
An arrangement according to claim 1, wherein on each surface, N+1 gradiometers of the Nth order are arranged, which measure linearly independent components.
Claim 6
Dependent Claim
23 words
An arrangement according to claim 2, wherein on each surface, N+1 gradiometers of the Nth order are arranged, which measure linearly independent components.
Claim 7
Dependent Claim
22 words
An arrangement according to claim 1, wherein additional gradiometers of less than the Nth order are situated on at least one surface.
Claim 8
Dependent Claim
22 words
An arrangement according to claim 2, wherein additional gradiometers of less than the Nth order are situated on at least one surface.
Claim 9
Dependent Claim
22 words
An arrangement according to claim 4, wherein additional gradiometers of less than the Nth order are situated on at least one surface.
Claim 10
Dependent Claim
40 words
An arrangement according to claim 6, wherein the following gradiometers are situated on at least one surface: N+1 gradiometers of the Nth order N gradiometers of the (N-1)th order N-1 gradiometers of the (N-2)th order gradiometer of the 0th order.
Claim 11
Dependent Claim
25 words
An arrangement according to claim 1, wherein the gradiometers situated on the same surface are layered above one another in a centered and flush manner.
Claim 12
Dependent Claim
25 words
An arrangement according to claim 2, wherein the gradiometers situated on the same surface are layered above one another in a centered and flush manner.
Claim 13
Dependent Claim
25 words
An arrangement according to claim 4, wherein the gradiometers situated on the same surface are layered above one another in a centered and flush manner.
Claim 14
Dependent Claim
25 words
An arrangement according to claim 6, wherein the gradiometers situated on the same surface are layered above one another in a centered and flush manner.
Claim 15
Dependent Claim
18 words
An arrangement according to claim 1, wherein each field receiving coil of a gradiometer comprises only one winding.
Claim 16
Dependent Claim
18 words
An arrangement according to claim 2, wherein each field receiving coil of a gradiometer comprises only one winding.
Claim 17
Dependent Claim
18 words
An arrangement according to claim 4, wherein each field receiving coil of a gradiometer comprises only one winding.
Claim 18
Dependent Claim
18 words
An arrangement according to claim 6, wherein each field receiving coil of a gradiometer comprises only one winding.
Claim 19
Dependent Claim
60 words
An arrangement according to claim 1, wherein the field receiving coils of a gradiometer of the Nth order are arranged in a matrix of m+1 rows and n+1 columns with m+n=N, and wherein the following applies to the coil surface A ij of the field receiving coil in row i and column j: ##EQU3## wherein i=0, 1,..., m and j=0,1,...,n.
Claim 20
Dependent Claim
54 words
An arrangement according to claim 4, wherein the field receiving coils of a gradiometer of the Nth order are arranged in a matrix of m+1 rows and n+1 columns with m+n=N, and wherein the following applies to the coil surface A ij of the field receiving coil in row i and column j: ##EQU4##
Claim 21
Dependent Claim
66 words
An arrangement according to claim 9, wherein the field receiving coils of a gradiometer of the Nth order are arranged in a matrix of m+1 rows and n+1 columns with m+n=N, and wherein the following applies to the coil surface A ij of the field receiving coil in row i and column j: ##EQU5## wherein i=0, 1,..., m and j=0,1,...,n, wherein i=0, 1,..., m and j=0,1,...,n.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-05-09 | 1997-11-08 | 1998-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-09 | 2001-11-08 | 2002-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-09 | 2005-11-08 | 2006-05-10 | $7700.00 | Window Closed / Lapsed |