US3592052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic crack depth measurement
Assignee: United States Department of the Navy
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Filing: 1969-01-08
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Granted: 1971-07-13
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Expires: 1989-01-08
Abstract
Abstract Ascertaining the depth of a crack in a welded specimen comprising generating a sonic wave inwardly on one face of the specimen, moving the source of said wave toward or away from said crack until a relatively strong reflection is detected, then moving said source away until the signal amplitude vanishes. The distance between the source and the weld is measured and the source then moved toward the weld until the signal amplitude again vanishes and the distance measured again. With these parameters and knowing the physical dimensions of the specimen the crack depth at the weld is mathematically determined.
Inventors
- 👤 Giulio Di Giacomo
- 👤 Solomon Goldspiel
- 👤 William J Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:35
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/22; G01N29/30; G01N2291/00; G01N2291/02; G01N2291/028; G01N2291/02854
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
152 words
A method for determining the depth of a crack at a weld in a metallic plate which comprises: generating an ultrasonic beam; directing said beam into said plate in the direction of said weld at approximately the skip distance therefrom; detecting the return signal; redirecting said beam perpendicularly away from said weld until a minimum return signal is detected, measuring the distance between the entrance of said beam into said plate and said weld S r to check said skip distance; repositioning said beam perpendicularly toward said weld until another minimum return signal is detected; measuring the distance between the entrance of said repositioned beam and the skip distance from said weld crack Delta ; measuring the sonic distance of said beam for said repositioned beam; whereby the depth of said crack can be ascertained in accordance with the following equation: D DEPTH 2d (PLATE THICKNESS) Delta (SONIC DISTANCE) X COS (O-R)
Claim 2
Independent Claim
152 words
A method for determining the depth of a crack at a weld in a metallic plate which comprises: generating an ultrasonic beam; directing said beam into said plate in the direction of said weld at approximately the skip distance therefrom; detecting the return signal; redirecting said beam perpendicularly away from said weld until a minimum return signal is detected, measuring the distance between the entrance of said beam into said plate and said weld S r to check said skip distance; repositioning said beam perpendicularly toward said weld until another minimum return signal is detected; measuring the distance between the entrance of said repositioned beam and the skip distance from said weld crack Delta ; measuring the sonic distance of said beam for said repositioned beam; whereby the depth of said crack can be ascertained in accordance with the following equation: D DEPTH 2d (PLATE THICKNESS) Delta (SONIC DISTANCE) X COS (O-R)
Claim 3
Dependent Claim
16 words
The method according to claim 1 wherein the sonic beam is coupled directly into said plate.
Claim 4
Dependent Claim
21 words
The method according to claim 2 wherein said generating and detecting are coupled to said plate at approximately the same location.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |