US5038104A
Expired / Lapsed
US
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Magnetometer flux pick-up coil with non-uniform interturn spacing optimized for spatial resolution
Assignee: Vanderbilt University
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Filing: 1990-02-05
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Granted: 1991-08-06
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Expires: 2010-02-05
Abstract
Abstract Pickup coils for imaging magnetometers are formed from plural turns of a conductor with varying spacing between turns selected so that the Fourier transform of the coil turns function which is the filter function of the coil, has no zeroes within the spatial frequency bandwidth of the magnetic field generated by a two or three dimensional current to be imaged. Various exemplary coil configurations are presented including a Gaussian distribution for the turns of a planar coil.
Inventors
- 👤 John P. Wikswo, Jr.
- 👤 Bradley J. Roth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:28
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02; G01R33/035; G01R33/0354; G01R33/0358; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/842; Y10S505/843; Y10S505/845
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
72 words
A flux pickup coil for measuring or mapping a magnetic field, said coil comprising a conductor disposed in a plurality of turns having a given total area and with non-uniform radial spacing between turns defined by a turns function having a filter function which has a first zero at a spatial frequency which is greater than a coil having a plurality of turns all of equal radius and said given total area.
Claim 2
Dependent Claim
72 words
A flux pickup coil for measuring or mapping a magnetic field, said coil comprising a conductor disposed in a plurality of turns having a given total area and with non-uniform radial spacing between turns defined by a turns function having a filter function which has a first zero at a spatial frequency which is greater than a coil having a plurality of turns all of equal radius and said given total area.
Claim 3
Dependent Claim
17 words
The coil of claim 1 wherein the spacing between turns is defined by a Gaussian turns function.
Claim 4
Dependent Claim
15 words
The coil of claim 2 wherein all of said turns are in a common plane.
Claim 5
Dependent Claim
47 words
The coil of claim 1 wherein the spacing between turns is defined by a turns function having the following relationship: ##EQU14## where h(r) is the turns function, C determines the total number of turns, α determines the overall size of the coil, and r is the radius.
Claim 6
Dependent Claim
16 words
The coil of claim 4 wherein all of said turns are substantially in a common plane.
Claim 7
Dependent Claim
47 words
The coil of claim 1 wherein the spacing between turns is defined by a turns function having the following relationship: ##EQU15## where h(r) is the turns function, C determines the total number of turns, α determines the overall size of the coil, and r is the radius.
Claim 8
Dependent Claim
16 words
The coil of claim 6 wherein all of said turns are substantially in a common plane.
Claim 9
Dependent Claim
16 words
The coil of claim 1 wherein all of said turns are substantially in a common plane
Claim 10
Dependent Claim
17 words
The coil of claim 8 wherein each of said turns is a circular turn of constant radius.
Claim 11
Dependent Claim
37 words
The coil of claim 9 wherein said circular turns are serially interconnected by aligned radially extending interconnecting conductor sections, and wherein an additional conductor section extends radially outward from the innermost turn adjacent said interconnecting conductor sections.
Claim 12
Dependent Claim
16 words
The coil of claim 10 wherein spacing between turns is defined by a Gaussian turns function.
Claim 13
Dependent Claim
52 words
The coil of claim 10 wherein the spacing between turns is defined by a turns function having the following relationship: ##EQU16## where h(r) is the turns function, C determines the number or turns in the coil, α is a factor determining the overall size of the coil, and r is the radius.
Claim 14
Dependent Claim
52 words
The coil of claim 10 wherein the spacing between turns is defined by a turns function having the following relationship: ##EQU17## where h(r) is the turns function, C determines the number of turns in the coil, α is a factor determining the overall size of the coil, and r is the radius.
Claim 15
Dependent Claim
17 words
The coil of claim 8 wherein said turns are formed by a spiral winding of said conductor.
Claim 16
Dependent Claim
16 words
The coil of claim 14 wherein the spacing between turns is defined by Gaussian turns function.
Claim 17
Dependent Claim
52 words
The coil of claim 14 wherein the spacing between turns is defined by a turns function having the following relationship: ##EQU18## where h(r) is the turns function, C determines the number of turns in the coil, α is a factor determining the overall size of the coil, and r is the radius.
Claim 18
Dependent Claim
52 words
The coil of claim 14 wherein the spacing between turns is defined by a turns function having the following relationship: ##EQU19## where h(r) is the turns function, C determines the number of turns in the coil, α is a factor determining the overall size of the coil, and r is the radius.
Claim 19
Dependent Claim
40 words
The coil of claim 8 wherein said conductor is wound in a first spiral which winds inward in one direction in one plane and winds outward in a concentric second spiral in the same direction in an adjacent parallel plane.
Claim 20
Dependent Claim
23 words
The coil of claim 18 wherein the spacing between turns in said first and second spirals is defined by a Gaussian turns function.
Claim 21
Dependent Claim
58 words
The coil of claim 18 wherein the spacing between turns in said first and second spirals is defined by a turns function having the following relationship: ##EQU20## where h(r) is the turns function, C determines the number of turns in the coil, α is a factor determining the overall size of the coil, and r is the radius.
Claim 22
Dependent Claim
57 words
The coil of claim 15 wherein the spacing between turns in said first and second spirals defined by a turns function having the following relationship: ##EQU21## where h(r) is the turns function, C determines the number of turns in the coil, α is a factor determining the overall isze of the coil, and r is the radius.
Claim 23
Dependent Claim
13 words
The coil of claim 8 wherein said conductor is wound with polygonal turns.
Claim 24
Dependent Claim
19 words
The coil of claim 22 wherein the spacing between said polygonal turns is defined by a Gaussian turns function.
Claim 25
Dependent Claim
64 words
The coil of claim 22 wherein the spacing between turns is defined by a turns function having the following relationship: ##EQU22## where h(r) is the turns function, C determines the number of turns in the coil, α is a factor determining the overall size of the coil, and r is the radius of the midpoint of a side of each turn of the coil.
Claim 26
Dependent Claim
65 words
The coil of claim 22 wherein the spacing between said polygonal turns is defined by a turns function having the following relationship: ##EQU23## where h(r) is the turns function, C determines the number of turns in the coil, is a factor determining the overall size of the coil, and r is the radius of the midpoint of a side of each turn of the coil.
Claim 27
Dependent Claim
44 words
The coil of claim 22 wherein each of said turns is a regular polygon and said turns are serially interconnected by aligned radially extending interconnecting conductor sections and wherein an additional conductor section extends radially outward from the innermost turn adjacent said interconnecting sections.
References Cited (Backward Citations)
US4517540A
Cited
US4490426A
Cited
US4453067A
Cited
US4613817A
Cited
US4593245A
Cited
US4585999A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-05 | 1995-02-04 | 1995-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-05 | 1999-02-04 | 1999-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-05 | 2003-02-04 | 2003-08-06 | $7700.00 | Window Closed / Lapsed |