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US5001674A
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US
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Ultrasonic testing method
Assignee: NGK Insulators Ltd
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Filing: 1989-12-21
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Granted: 1991-03-19
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Expires: 2009-12-21
Abstract
Abstract An ultrasonic testing method comprises steps of transmitting an ultrasonic wave from a probe to a test article, detecting an internal flaw in the test article by a reflected flaw echo from the internal flaw, and deciding a condition of the detected flaw by comparing and analyzing frequency components of the transmitted ultrasonic wave and the reflected flaw echo. The probe has a curved tip surface which is the same kind as that of a curved incident surface of the test article and has a radius of curvature of 0.5˜2.0 times the radius of curvature of the curved incident surface of the test article.
Inventors
- 👤 Keiji Kawasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:30
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/22; G01N29/24; G01N29/2456; G01N29/221; G01N29/34; G01N29/348; G01N2291/00; G01N2291/02; G01N2291/023; G01N2291/0232; G01N2291/0234; G01N2291/04; G01N2291/042; G01N2291/0423; G01N2291/0428; G01N2291/26; G01N2291/263; G01N2291/2634; G01N2291/265
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
98 words
An ultrasonic testing method for detecting internal flaws in a test article, comprising the steps of: providing a test article having a concavely curved incident surface; providing an ultrasonic test probe having a concavely curved tip surface from which an ultrasonic wave is transmitted, said concavely curved tip surface being of the same shape as, and having a radius of curvature of 0.5 ˜2.0 times that of said concavely curved incident surface of said test article; and transmitting an ultrasonic wave from said ultrasonic test probe to said test article to detect internal flaws in said test article.
Claim 2
Dependent Claim
98 words
An ultrasonic testing method for detecting internal flaws in a test article, comprising the steps of: providing a test article having a concavely curved incident surface; providing an ultrasonic test probe having a concavely curved tip surface from which an ultrasonic wave is transmitted, said concavely curved tip surface being of the same shape as, and having a radius of curvature of 0.5 ˜2.0 times that of said concavely curved incident surface of said test article; and transmitting an ultrasonic wave from said ultrasonic test probe to said test article to detect internal flaws in said test article.
Claim 3
Dependent Claim
24 words
The method of claim 1, wherein said test article has a spherical-shaped incident surface and said ultrasonic test probe has a spherical-shaped tip surface.
Claim 4
Dependent Claim
24 words
The method of claim 1, wherein said test article has a cylindrical-shaped incident surface and said ultrasonic test probe has a cylindrical-shaped tip surface.
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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) | 1994-03-18 | 1994-09-17 | 1995-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-18 | 1998-09-17 | 1999-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-18 | 2002-09-17 | 2003-03-19 | $7700.00 | Window Closed / Lapsed |