US4480225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improved multi-directional eddy current inspection test apparatus for detecting flaws in metal articles
Assignee: United States Department of Energy
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Filing: 1982-02-11
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Granted: 1984-10-30
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Expires: 2002-02-11
Abstract
Abstract Apparatus is described for detecting flaws in a tubular workpiece in a single scan. The coils of a dual coil bobbin eddy current inspection probe are wound at a 45° angle to the transverse axis of the probe, one coil having an angular position about the axis about 90° relative to the angular position of the other coil, and the angle of intersection of the planes containing the coils being about 60°.
Inventors
- 👤 Roy A. Nance
- 👤 William H. Hartley
- 👤 Alfred J. Caffarel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:32
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/90; G01N27/904; G01N27/9006
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
98 words
An eddy current inspection apparatus comprising a body having an axis, first and second coils disposed about said body spaced axially one from the other, said first coil lying in a first plane intersected by said axis to form a first acute angle therewith, said second coil lying in a second plane intersected by said axis to form a second acute angle therewith, said first and second planes being nonparallel one to the other and intersect each other at an angle of about 60° and said first and second acute angles having different angular positions about said axis.
Claim 2
Dependent Claim
98 words
An eddy current inspection apparatus comprising a body having an axis, first and second coils disposed about said body spaced axially one from the other, said first coil lying in a first plane intersected by said axis to form a first acute angle therewith, said second coil lying in a second plane intersected by said axis to form a second acute angle therewith, said first and second planes being nonparallel one to the other and intersect each other at an angle of about 60° and said first and second acute angles having different angular positions about said axis.
Claim 3
Dependent Claim
95 words
An eddy current inspection apparatus comprising a body formed of a non-conductive material and having an axis, first and second coils about said body at an angle of about 45° to said axis, and first and second planes containing respectively said first and second coils, said two coils being located about said body such that the angular position of said second coil about said axis is about 90° relative to the angular position of said first coil about said axis, and said first and second planes intersecting each other at an angle of about 60°.
Claim 4
Dependent Claim
95 words
An eddy current inspection apparatus comprising a body formed of a non-conductive material and having an axis, first and second coils about said body at an angle of about 45° to said axis, and first and second planes containing respectively said first and second coils, said two coils being located about said body such that the angular position of said second coil about said axis is about 90° relative to the angular position of said first coil about said axis, and said first and second planes intersecting each other at an angle of about 60°.
Claim 5
Dependent Claim
97 words
An eddy current inspection apparatus comprising a body formed of a non-conductive material and having an axis, and first and second coils about said body each at an angle of about 45° to said axis, said two coils being located about said body such that the angular position of said second coil about said axis is about 90° relative to the angular position of said first coil about said axis and said first and second coils are contained in first and second planes, said first and second planes intersect each other at an angle of about 60°.
Claim 6
Dependent Claim
97 words
An eddy current inspection apparatus comprising a body formed of a non-conductive material and having an axis, and first and second coils about said body each at an angle of about 45° to said axis, said two coils being located about said body such that the angular position of said second coil about said axis is about 90° relative to the angular position of said first coil about said axis and said first and second coils are contained in first and second planes, said first and second planes intersect each other at an angle of about 60°.
Claim 7
Dependent Claim
18 words
The eddy current inspection probe of claim 3 wherein said non-conductive core is formed of a plastic material.
Claim 8
Dependent Claim
24 words
The eddy current inspection probe of claim 4 wherein said plastic material is selected from the group consisting of mycarta, nylon, and epoxy resins.
Claim 9
Dependent Claim
19 words
The eddy current inspection apparatus of claim 3 wherein said body comprises a probe for use inside a workpiece.
Claim 10
Dependent Claim
16 words
The probe of claim 6 wherein said non-conductive core material is formed of a plastic material.
Claim 11
Dependent Claim
21 words
The probe of claim 7 wherein the plastic material is selected from the group consisting of mycarta, nylon, and epoxy resins.
Claim 12
Dependent Claim
23 words
The eddy current inspection apparatus of claim 3 wherein said body comprises an encircling coil for use around the outside of a workpiece.
Claim 13
Dependent Claim
17 words
The encircling coil of claim 9 wherein said nonconductive core material is formed of a plastic material.
Claim 14
Dependent Claim
22 words
The encircling coil of claim 10 wherein the plastic material is selected from the group consisting of mycarta, nylon, and epoxy resins.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-30 | 1988-04-30 | 1988-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-30 | 1992-04-30 | 1992-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-30 | 1996-04-30 | 1996-10-30 | $7700.00 | Window Closed / Lapsed |