US3745813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic inspection roll system
Assignee: ELECTRONICS RES CO Ltd
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Filing: 1971-04-07
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Granted: 1973-07-17
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Expires: 1991-04-07
Abstract
Abstract In a roll system for ultrasonic inspection of steel plates or other materials using a double temperature gradient delay line, a predetermined safety zone is provided against possible wear of the delay line materials. The first delay line material in the roll assembly is so constructed as to serve as an acoustic beam lens through which inputs and outputs of transducers are switched at a high speed cycle.
Inventors
- 👤 S Uozumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:32
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/22; G01N29/28; G01N2291/00; G01N2291/02; G01N2291/023; G01N2291/0234; G01N2291/028; G01N2291/02854
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
203 words
In a roll system for ultrasonic inspection of flaws of materials wherein ultrasonic signals are transmitted into and received from a material to be tested through a double temperature gradient delay line composed of a first delay line and a second delay line, the second delay line has the form of a hollow cylindrical roll with an axial, fixed shaft, enclosing a liquid for cooling and acoustical coupling through the hollow roll, and the first delay line including at least one transducer which is connected to the axial, fixed shaft of the roll, and the outer face of the first delay line contacts the inner face of the hollow roll, the improvement wherein said second delay line is composed of an acoustic impedance material analoguous to and of the same quality as the test material, and the said two delay lines have a relationship between them and the test material such that t2>t1>tx, so as to provide a predetermined safety zone against wear of both the delay line materials, wherein t1 is the ultrasonic propagation time in the first delay line, t2 is the ultrasonic propagation time in the second delay line and tx is the ultrasonic propagation time in the test material.
Claim 2
Dependent Claim
203 words
In a roll system for ultrasonic inspection of flaws of materials wherein ultrasonic signals are transmitted into and received from a material to be tested through a double temperature gradient delay line composed of a first delay line and a second delay line, the second delay line has the form of a hollow cylindrical roll with an axial, fixed shaft, enclosing a liquid for cooling and acoustical coupling through the hollow roll, and the first delay line including at least one transducer which is connected to the axial, fixed shaft of the roll, and the outer face of the first delay line contacts the inner face of the hollow roll, the improvement wherein said second delay line is composed of an acoustic impedance material analoguous to and of the same quality as the test material, and the said two delay lines have a relationship between them and the test material such that t2>t1>tx, so as to provide a predetermined safety zone against wear of both the delay line materials, wherein t1 is the ultrasonic propagation time in the first delay line, t2 is the ultrasonic propagation time in the second delay line and tx is the ultrasonic propagation time in the test material.
Claim 3
Dependent Claim
91 words
The ultrasonic inspection roll system of claim 1, wherein said delay lines are made according to the following relationship to form a ultrasonic beam converging lens system: (R0-R1+d)/(R1) > (1)/(1/n2-2/n Square Root 1-N2+1) (n identical D/R0, n identical v1/v2) where R0 is the radius of curvature of the transducer, R1 is the radius of the roll bore, 2D is width of the transducer, d is the first delay line thickness, v1 is the sound velocity in the first delay line, and v2 is the sound velocity in the second delay line.
Claim 4
Dependent Claim
88 words
The ultrasonic inspection roll system of claim 1, wherein said delay lines are made according to the following relationship to form an ultrasonic beam converging lens system, said transducer being a plane transducer: (R1/R2)2 < 1 - n2 and R1 > (1/n - 1)(R2 - R1) n v1/v2 where R1 is the radius of the roll, R2 is the radius of the outer circumference of the roll, v1 is the sound velocity in the first delay line and v2 is the sound velocity in the second delay line.
Claim 5
Dependent Claim
97 words
The ultrasonic inspection roll system of claim 2 wherein said ultrasonic beam scanning system includes m transducers mounted to said first delay line on a concentric circle facing the roll center, so that the spectrum of the respective ultrasonic beams on the roll surface are such that the beams of adjoining transducers cross each other at the -3dB position, and said transducers are connected to be successively switched for scanning the area near the roll contacting line with the test material so as to cover effects caused by a possible positional shift of the roll contacting line.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |