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US4383446A
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Method for non-destructively testing construction elements
Assignee: Individual
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Filing: 1981-03-27
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Granted: 1983-05-17
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Expires: 2001-03-27
Abstract
Abstract A method of non-destructively testing construction elements accessible from only one side by measuring their resonant oscillations to detect flaws in them without scanning. A test piece (1) is excited with a narrow band ultrasonic oscillation whose frequency is varied; the amplitudes of the resonant oscillations are measured and plotted in an xy coordinate system against the frequency of the exciting ultrasonic oscillations.
Inventors
- 👤 Eckhard Roeder
- 👤 Wolfgang Flake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:47
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/32; G01N29/00; G01N29/04; G01N29/12; G01N29/44; G01N29/4454; G01N2291/00; G01N2291/02; G01N2291/028; G01N2291/02827; G01N2291/0289
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
80 words
Method for non-destructively testing construction elements by measuring their resonant oscillations, comprising: exciting a test piece (1) with a narrow band ultrasonic oscillation, varying the oscillation frequency, measuring the amplitudes of resonant oscillations in the test piece, and plotting said resonant amplitudes in an xy coordinate system against the frequency of the exciting ultrasonic oscillations, wherein resonant amplitude deviations are directly measured by a constant voltage decoupling of the measured amplitudes of the resonant oscillations, and amplitude envelopes are formed.
Claim 2
Dependent Claim
80 words
Method for non-destructively testing construction elements by measuring their resonant oscillations, comprising: exciting a test piece (1) with a narrow band ultrasonic oscillation, varying the oscillation frequency, measuring the amplitudes of resonant oscillations in the test piece, and plotting said resonant amplitudes in an xy coordinate system against the frequency of the exciting ultrasonic oscillations, wherein resonant amplitude deviations are directly measured by a constant voltage decoupling of the measured amplitudes of the resonant oscillations, and amplitude envelopes are formed.
Claim 3
Dependent Claim
42 words
Method according to claim 1, wherein the frequency of the exciting ultrasonic oscillation is varied in stages, and limit values for the amplitudes of the resonant oscillations of the construction element are set for each stage for purposes of fully automatic evaluation.
References Cited (Backward Citations)
US2716887A
Cited
US3872443A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-16 | 1986-11-15 | 1987-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-16 | 1990-11-15 | 1991-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-16 | 1994-11-15 | 1995-05-17 | $7700.00 | Window Closed / Lapsed |