Patent US3890565A successfully refreshed from Google Patents.
US3890565A
Expired / Lapsed
US
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Measuring core reductance
Assignee: United States Department of the Navy
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Filing: 1960-04-25
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Granted: 1975-06-17
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Expires: 1980-04-25
Abstract
Abstract 1. A method for measuring the reductance of cores in a total field magnetometer wherein the magnetometer is placed in a constant, unidirectional magnetic field of a predetermined value, the magnetometer comprising three pairs of previously matched orthogonally arranged cores, the first pair of matched cores being parallel to the magnetic field, the second and third pair of matched cores being perpendicular to the magnetic field, which comprises the steps of (1) substituting for one of the cores of the second pair of matched cores a different core which is to be tested, (2) applying calibrated magnetic fields parallel to the first pair of cores to produce a first effect on the magnetometer, (3) rotating the magnetometer 90* from an original position about an axis parallel to the third pair of cores to produce a second effect on the magnetometer, (4) rotating the magnetometer 90* back to the original position thereof and (5) measuring the difference between the first and second effects whereby the difference measurement is indicative of said different core reductance.
Inventors
- 👤 Arthur W Obenschain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:47
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02; G01R27/00; G01R27/02; G01R27/26; G01R27/2611
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
172 words
A method for measuring the reductance of cores in a total field magnetometer wherein the magnetometer is placed in a constant, unidirectional magnetic field of a predetermined value, the magnetometer comprising three pairs of previously matched orthogonally arranged cores, the first pair of matched cores being parallel to the magnetic field, the second and third pair of matched cores being perpendicular to the magnetic field, which comprises the steps of (1) substituting for one of the cores of the second pair of matched cores a different core which is to be tested, (2) applying calibrated magnetic fields parallel to the first pair of cores to produce a first effect on the magnetometer, (3) rotating the magnetometer 90* from an original position about an axis parallel to the third pair of cores to produce a second effect on the magnetometer, (4) rotating the magnetometer 90* back to the original position thereof and (5) measuring the difference between the first and second effects whereby the difference measurement is indicative of said different core reductance.
Claim 2
Independent Claim
172 words
A method for measuring the reductance of cores in a total field magnetometer wherein the magnetometer is placed in a constant, unidirectional magnetic field of a predetermined value, the magnetometer comprising three pairs of previously matched orthogonally arranged cores, the first pair of matched cores being parallel to the magnetic field, the second and third pair of matched cores being perpendicular to the magnetic field, which comprises the steps of (1) substituting for one of the cores of the second pair of matched cores a different core which is to be tested, (2) applying calibrated magnetic fields parallel to the first pair of cores to produce a first effect on the magnetometer, (3) rotating the magnetometer 90* from an original position about an axis parallel to the third pair of cores to produce a second effect on the magnetometer, (4) rotating the magnetometer 90* back to the original position thereof and (5) measuring the difference between the first and second effects whereby the difference measurement is indicative of said different core reductance.
Claim 3
Independent Claim
116 words
A method for measuring the reductance of cores wherein a plurality of matched orthogonal cores are in a constant magnetic field which comprises the steps of (1) substituting for one of the matched cores a different core which is to be tested thus forming a test block, (2) applying calibrated magnetic fields to said block to produce a first effect therein, (3) rotating said block and said different core 90* from an original position with respect to the constant field about an axis perpendicular to said different core to produce a second effect therein and (4) measuring the difference between the first and second effects, whereby the difference measurement is indicative of said different core reductance.
Claim 4
Independent Claim
116 words
A method for measuring the reductance of cores wherein a plurality of matched orthogonal cores are in a constant magnetic field which comprises the steps of (1) substituting for one of the matched cores a different core which is to be tested thus forming a test block, (2) applying calibrated magnetic fields to said block to produce a first effect therein, (3) rotating said block and said different core 90* from an original position with respect to the constant field about an axis perpendicular to said different core to produce a second effect therein and (4) measuring the difference between the first and second effects, whereby the difference measurement is indicative of said different core reductance.
Claim 5
Dependent Claim
16 words
The method of claim 2 wherein said block is rotated back to the original position thereof.
Claim 6
Independent Claim
191 words
A method of measuring the reductance of cores in a total field magnetometer wherein the magnetometer is placed in a constant, unidirectional magnetic field of a predetermined value, the magnetometer comprising an arrangement of three pairs of orthogonally arranged cores, the first pair of cores being placed parallel to the magnetic field, the second and third pairs of matched cores being placed perpendicular to the magnetic field which comprises the steps of (1) placing three pairs of reductance matched cores in the orthogonal arrangement of the magnetometer, (2) replacing one of the cores of the second pair of reductance matched cores with a different core to be tested, (3) applying a calibrated magnetic field parallel to the first pair of cores to produce a first effect on the magnetometer, (4) rotating the magnetometer 90* from an original position about an axis parallel to the third pair of cores to produce a second effect on the magnetometer, (5) rotating the magnetometer 90* back to the original position thereof, and (6) measuring the difference between the first and second effects whereby the difference measurement is indicative of the reductance of said different core.
Claim 7
Independent Claim
191 words
A method of measuring the reductance of cores in a total field magnetometer wherein the magnetometer is placed in a constant, unidirectional magnetic field of a predetermined value, the magnetometer comprising an arrangement of three pairs of orthogonally arranged cores, the first pair of cores being placed parallel to the magnetic field, the second and third pairs of matched cores being placed perpendicular to the magnetic field which comprises the steps of (1) placing three pairs of reductance matched cores in the orthogonal arrangement of the magnetometer, (2) replacing one of the cores of the second pair of reductance matched cores with a different core to be tested, (3) applying a calibrated magnetic field parallel to the first pair of cores to produce a first effect on the magnetometer, (4) rotating the magnetometer 90* from an original position about an axis parallel to the third pair of cores to produce a second effect on the magnetometer, (5) rotating the magnetometer 90* back to the original position thereof, and (6) measuring the difference between the first and second effects whereby the difference measurement is indicative of the reductance of said different core.
References Cited (Backward Citations)
US2491736A
Cited
US2958819A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |