US4622853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser induced acoustic generation for sonic modulus
Assignee: Union Camp Corp
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Filing: 1985-08-23
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Granted: 1986-11-18
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Expires: 2005-08-23
Abstract
Abstract A method and device which measures the velocity of ultrasonic waves in a moving web is disclosed. The excitation source is a laser or other device which produces short intense light pulses and the detection system is either a piezoelectric transducer or a microphone. The latter obviates any need for physical contact with the web in order to carry out tests for strength parameters as the web is manufactured.
Inventors
- 👤 Mary A. Leugers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:14
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/22; G01N29/24; G01N29/2418; G01N29/04; G01N29/07; G01N2291/00; G01N2291/02; G01N2291/023; G01N2291/0237; G01N2291/028; G01N2291/02827; G01N2291/04; G01N2291/042; G01N2291/0421; G01N2291/0422
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
60 words
A method of non-destructively testing, free of physical contact, a physical property of a moving web or sheet of paper, which comprises; beaming a source of short light pulses and amplitudes at said moving web or sheet; and measuring the velocity of the ultrasonic waves produced in the web or sheet by the thermal effect induced by the light pulses.
Claim 2
Independent Claim
60 words
A method of non-destructively testing, free of physical contact, a physical property of a moving web or sheet of paper, which comprises; beaming a source of short light pulses and amplitudes at said moving web or sheet; and measuring the velocity of the ultrasonic waves produced in the web or sheet by the thermal effect induced by the light pulses.
Claim 3
Independent Claim
64 words
A method for non-destructively testing a physical property of a moving web or sheet of paper, which comprises; beaming a source of short light pulses on said moving web or sheet; and detecting the ultrasound velocities responsive to the thermal effect induced by the light pulses by means of a piezo-electric transducer which makes physical contact with the moving web or sheet of paper.
Claim 4
Independent Claim
64 words
A method for non-destructively testing a physical property of a moving web or sheet of paper, which comprises; beaming a source of short light pulses on said moving web or sheet; and detecting the ultrasound velocities responsive to the thermal effect induced by the light pulses by means of a piezo-electric transducer which makes physical contact with the moving web or sheet of paper.
Claim 5
Dependent Claim
57 words
In a method of non-destructively testing a physical property of a light absorbing, moving web of paper, the improvement whereby all physical contact with the web is eliminated, comprising: beaming a source of short light pulses at said light absorbing moving web; and detecting the ultrasound velocities responsive to the thermal effect induced by the light pulses.
Claim 6
Dependent Claim
57 words
In a method of non-destructively testing a physical property of a light absorbing, moving web of paper, the improvement whereby all physical contact with the web is eliminated, comprising: beaming a source of short light pulses at said light absorbing moving web; and detecting the ultrasound velocities responsive to the thermal effect induced by the light pulses.
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) | 1989-11-17 | 1990-05-19 | 1990-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-17 | 1994-05-19 | 1994-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-17 | 1998-05-19 | 1998-11-18 | $7700.00 | Window Closed / Lapsed |