US4631533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display of eddy current detector data
Assignee: Westinghouse Electric Co LLC
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Filing: 1984-06-15
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Granted: 1986-12-23
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Expires: 2004-06-15
Abstract
Abstract A method and apparatus for producing a display of eddy current test data from signals produced by an eddy current detector which is supplied with an alternating current signal composed of alternating currents at several different frequencies, the detector signals including a respective signal associated with each current frequency and varying in amplitude and in phase relative to its associated alternating current as the detector is displaced relative to a test body. For each detector signal, a data signal representing the detector signal component in phase with the associated alternating current and a data signal representing the detector signal component in quadrature with the associated alternating current are generated, a representation of each data signal is stored, and the representation of each data signal is supplied to a display device for producing a first display composed of visible representations of all data signals along parallel axis, with each axis being associated with a respective data signal and being representative of the movement of the detector relative to the test body. When desired, end points of a visible representation of a data signal along the axis associated with that representation are selected and a second display representing the ratio of the value of that data signal to the value of the data signal generated from the same detector signal, for signal values between the selected end points, is produced.
Inventors
- 👤 Richard H. Mark, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:04
CPC Classifications
G; G01; G01D; G01D3/00; G01D3/02; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/90; G01N27/9046; G01N27/9073
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
183 words
A method for producing a display of eddy current test data from signals produced by an eddy current detector which is supplied with an alternating current signal composed of alternating currents at several different frequencies, the detector signals including a respective signal associated with each alternating current and varying in amplitude and in phase relative to its associated alternating current as the detector is displaced along a selected path relative to a test body, comprising: generating, from each detector signal, a data signal representing the detector signal component in phase with the alternating current associated with that detector signal and a data signal representing the detector signal component in quadrature with the alternating current associated with that detector signal; storing a representation of each data signal; and supplying the representation of each data signal to a display device for producing a first display composed of visible representations of all data signals along parallel reference axes, with each reference axis being associated with a respective data signal and being representative of the selected path of movement of the detector relative to the test body.
Claim 2
Independent Claim
183 words
A method for producing a display of eddy current test data from signals produced by an eddy current detector which is supplied with an alternating current signal composed of alternating currents at several different frequencies, the detector signals including a respective signal associated with each alternating current and varying in amplitude and in phase relative to its associated alternating current as the detector is displaced along a selected path relative to a test body, comprising: generating, from each detector signal, a data signal representing the detector signal component in phase with the alternating current associated with that detector signal and a data signal representing the detector signal component in quadrature with the alternating current associated with that detector signal; storing a representation of each data signal; and supplying the representation of each data signal to a display device for producing a first display composed of visible representations of all data signals along parallel reference axes, with each reference axis being associated with a respective data signal and being representative of the selected path of movement of the detector relative to the test body.
Claim 3
Dependent Claim
29 words
A method as defined in claim 1 further comprising varying the scale of a selected visible representation in the direction of the reference axis associated with that visible representation.
Claim 4
Dependent Claim
30 words
A method as defined in claim 1 further comprising varying the scale of a selected visible representation in the direction perpendicular to the reference axis associated with that visible representation.
Claim 5
Dependent Claim
27 words
A method as defined in claim 1 further comprising varying the position of a selected visible representation relative to the reference axis associated with that visible representation.
Claim 6
Dependent Claim
78 words
A method as defined in claim 1 further comprising selecting end points of a visible representation of a data signal representing one component of a detector signal along the reference axis associated with that representation, and producing a second display constituting a visible representation of the ratio of the value of that data signal to the value of the data signal representing the other component of the same detector signal, for signal values between the selected end points.
Claim 7
Dependent Claim
188 words
Apparatus for producing a display of eddy current test data from signals produced by an eddy current detector which is supplied with an alternating current signal composed of alternating currents at several different frequencies, the detector signals including a respective signal associated with each alternating current and varying in amplitude and in phase relative to its associated alternating current as the detector is displaced along a selected path relative to a test body, comprising: means for storing, with respect to each detector signal, a representation of a data signal representing the detector signal component in phase with the alternating current associated with that detector signal and a representation of a data signal representing the detector signal component in quadrature with the alternating current associated with that detector signal; and display means connected to said means for storing for receiving each data signal representation and for producing a first display composed of representations of all data signals along parallel reference axes, with each reference axis being associated with a respective data signal and being representative of the selected path of movement of the detector relative to the test body.
Claim 8
Dependent Claim
188 words
Apparatus for producing a display of eddy current test data from signals produced by an eddy current detector which is supplied with an alternating current signal composed of alternating currents at several different frequencies, the detector signals including a respective signal associated with each alternating current and varying in amplitude and in phase relative to its associated alternating current as the detector is displaced along a selected path relative to a test body, comprising: means for storing, with respect to each detector signal, a representation of a data signal representing the detector signal component in phase with the alternating current associated with that detector signal and a representation of a data signal representing the detector signal component in quadrature with the alternating current associated with that detector signal; and display means connected to said means for storing for receiving each data signal representation and for producing a first display composed of representations of all data signals along parallel reference axes, with each reference axis being associated with a respective data signal and being representative of the selected path of movement of the detector relative to the test body.
Claim 9
Dependent Claim
96 words
Apparatus as defined in claim 6 further comprising interactive, operator actuated display control means connected to said display means and operable for effecting selection of end points of a visible representation of a data signal representing one component of a detector signal along the reference axis associated with that representation, and means for producing a second display constituting a visible representation of the ratio of the value of the data signal to the value of the data signal representative of the other component of the same detector signal, for signal values between the selected end points.
Claim 10
Dependent Claim
43 words
A method as defined in claim 1 wherein the display device is a color display device and said step of supplying is carried out for causing the visible representation of each data signal of said first display to have a respectively different color.
Claim 11
Dependent Claim
47 words
Apparatus as defined in claim 6 wherein said display means comprise a color display device and said means for storing supply to said display means data signal representations for causing the visible representation of each data signal of said first display to have a respectively different color.
References Cited (Backward Citations)
US3406387A
Cited
US3476974A
Cited
US3599033A
Cited
US3596284A
Cited
US3895290A
Cited
US4237419A
Cited
US4210917A
Cited
US4346378A
Cited
US4303885A
Cited
US4467281A
Cited
US4328491A
Cited
US4405920A
Cited
US4498080A
Cited
US4510571A
Cited
US4586036A
Cited
US4550316A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-22 | 1990-06-23 | 1990-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-22 | 1994-06-23 | 1994-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-22 | 1998-06-23 | 1998-12-23 | $7700.00 | Window Closed / Lapsed |