Patent US3690155A successfully refreshed from Google Patents.
US3690155A
Expired / Lapsed
US
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Apparatus for measuring sound velocity in a workpiece
Assignee: Motors Liquidation Co
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Filing: 1970-10-30
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Granted: 1972-09-12
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Expires: 1990-10-30
Abstract
Abstract A method and apparatus for determining the velocity of sound in a workpiece. The workpiece is placed between sending and receiving electroacoustic transducers that are spaced a predetermined distance in a sound transmitting medium. The sending electroacoustic transducer is pulsed so as to generate acoustic impulses directed toward the receiving electroacoustic transducer, which detects both the impulse and a delayed image of the impulse. A first signal that is proportional to the elapsed time between the generation and the detection of an impulse and a second signal that is proportional to the elapsed time between the detection of the impulse and the detection of the delayed image of the impulse are combined by a signal gen-erating network with a third signal that is proportional to the time that is required for sound to travel the predetermined distance in the medium so as to produce an output signal which is proportional to the velocity of the impulse through the workpiece.
Inventors
- 👤 Richard H Eichler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:04
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/04; G01N29/07; G01N29/02; G01N29/024
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
216 words
Apparatus for indicating the velocity of sound in a workpiece comprising, in combination, a sound transmitting medium, first electroacoustic transducer means for generating an acoustic impulse, second electroacoustic transducer means for detecting both the acoustic impulse and a delayed image of the impulse, the workpiece being positioned in the medium between the first and second electroacoustic transducer means so as to effect transmission of the impulse from the first electroacoustic transducer means through the workpiece to the second electroacoustic transducer means, pulser means for pulsing the first electroacoustic transducer means, thereby causing it to generate the impulse directed toward the second electroacoustic transducer means, first signal generating means responsive to the pulser and the second electroacoustic transducer means for generating a first signal that is proportional to the elapsed time between the generation of the impulse by the first electroacoustic transducer means and the detection of the impulse by the second electroacoustic transducer means, second signal generating means for generating a second signal that is proportional to the elapsed time between the detection of the impulse and the detection of the delayed image of the impulse by the second electroacoustic transducer means, and means responsive to the first and second signals for generating a signal that is proportional to the velocity of sound in the workpiece.
Claim 2
Dependent Claim
216 words
Apparatus for indicating the velocity of sound in a workpiece comprising, in combination, a sound transmitting medium, first electroacoustic transducer means for generating an acoustic impulse, second electroacoustic transducer means for detecting both the acoustic impulse and a delayed image of the impulse, the workpiece being positioned in the medium between the first and second electroacoustic transducer means so as to effect transmission of the impulse from the first electroacoustic transducer means through the workpiece to the second electroacoustic transducer means, pulser means for pulsing the first electroacoustic transducer means, thereby causing it to generate the impulse directed toward the second electroacoustic transducer means, first signal generating means responsive to the pulser and the second electroacoustic transducer means for generating a first signal that is proportional to the elapsed time between the generation of the impulse by the first electroacoustic transducer means and the detection of the impulse by the second electroacoustic transducer means, second signal generating means for generating a second signal that is proportional to the elapsed time between the detection of the impulse and the detection of the delayed image of the impulse by the second electroacoustic transducer means, and means responsive to the first and second signals for generating a signal that is proportional to the velocity of sound in the workpiece.
Claim 3
Dependent Claim
251 words
Apparatus for indicating the velocity of sound in a workpiece comprising, in combination, a sound transmitting medium, a first electroacoustic transducer positioned in the medium for generating an acoustic impulse, a second electroacoustic transducer positioned in the medium for detecting both the acoustic impulse and a delayed image of the impulse, the workpiece being positioned between the transducers in the medium, pulser means for pulsing the first electroacoustic transducer, thereby causing it to generate the impulse directed toward the second electroacoustic transducer, first signal generating means responsive both to the pulser and to the second electroacoustic transducer for generating a first signal that is proportional to the elapsed time between the generation of the impulse by the first electroacoustic transducer and the detection of the impulse by the second electroacoustic transducer, second signal generating means for generating a second signal that is proportional to the elapsed time between the detection of the impulse and the detection of the delayed image of the impulse by the second electroacoustic transducer, third signal generating means for generating a third signal that is proportional to the time required for sound to travel through the medium for the distance between the first and second electroacoustic transducers, fourth signal generating means responsive to the first, second, and third signals for generating a fourth signal that is proportional to the thickness of the workpiece, and means responsive to the second and fourth signals for generating a signal that is proportional to the velocity of sound in the workpiece.
Claim 4
Dependent Claim
251 words
Apparatus for indicating the velocity of sound in a workpiece comprising, in combination, a sound transmitting medium, a first electroacoustic transducer positioned in the medium for generating an acoustic impulse, a second electroacoustic transducer positioned in the medium for detecting both the acoustic impulse and a delayed image of the impulse, the workpiece being positioned between the transducers in the medium, pulser means for pulsing the first electroacoustic transducer, thereby causing it to generate the impulse directed toward the second electroacoustic transducer, first signal generating means responsive both to the pulser and to the second electroacoustic transducer for generating a first signal that is proportional to the elapsed time between the generation of the impulse by the first electroacoustic transducer and the detection of the impulse by the second electroacoustic transducer, second signal generating means for generating a second signal that is proportional to the elapsed time between the detection of the impulse and the detection of the delayed image of the impulse by the second electroacoustic transducer, third signal generating means for generating a third signal that is proportional to the time required for sound to travel through the medium for the distance between the first and second electroacoustic transducers, fourth signal generating means responsive to the first, second, and third signals for generating a fourth signal that is proportional to the thickness of the workpiece, and means responsive to the second and fourth signals for generating a signal that is proportional to the velocity of sound in the workpiece.
Claim 5
Dependent Claim
260 words
Apparatus for indicating the velocity of sound in a workpiece comprising, in combination, a sound transmitting medium, a first crystal positioned in the medium for generating an acoustic impulse, a second crystal positioned in the medium for detecting both the acoustic impulse and a delayed image of the impulse, the workpiece being positioned between the crystals in the medium so that the impulse travels through the workpiece, pulser means for pulsing the first crystal so as to cause it to generate the impulse directed toward the second crystal, first clock means responsive to the pulser and the second crystal for generating a first signal that is proportional to the elapsed time between the generation of the impluse by the first crystal and the detection of the impulse by the second crystal, second clock means for generating a second signal that is proportional to the elapsed time between the detection of the impulse and the detection of the delayed image of the impulse by the second crystal, the second signal being proportional to the time that is required for sound to pass through the workpiece, means for generating a third signal that is proportional to the time required for sound to travel through the medium for the distance between the transducers, means responsive to the first, second, and third signals for generating a fourth signal that is proportional to the thickness of the workpiece, and means for dividing the fourth signal by the second signal, thereby generating an output signal that is proportional to the velocity of sound in the workpiece.
Claim 6
Dependent Claim
260 words
Apparatus for indicating the velocity of sound in a workpiece comprising, in combination, a sound transmitting medium, a first crystal positioned in the medium for generating an acoustic impulse, a second crystal positioned in the medium for detecting both the acoustic impulse and a delayed image of the impulse, the workpiece being positioned between the crystals in the medium so that the impulse travels through the workpiece, pulser means for pulsing the first crystal so as to cause it to generate the impulse directed toward the second crystal, first clock means responsive to the pulser and the second crystal for generating a first signal that is proportional to the elapsed time between the generation of the impluse by the first crystal and the detection of the impulse by the second crystal, second clock means for generating a second signal that is proportional to the elapsed time between the detection of the impulse and the detection of the delayed image of the impulse by the second crystal, the second signal being proportional to the time that is required for sound to pass through the workpiece, means for generating a third signal that is proportional to the time required for sound to travel through the medium for the distance between the transducers, means responsive to the first, second, and third signals for generating a fourth signal that is proportional to the thickness of the workpiece, and means for dividing the fourth signal by the second signal, thereby generating an output signal that is proportional to the velocity of sound in the workpiece.
Claim 7
Independent Claim
218 words
A method for determining the velocity of sound in a workpiece that is positioned between first and second electroacoustic transducers that are spaced a predetermined distance in a sound transmitting medium comprising the steps of generating an acoustic impulse with the first electroacoustic transducer, the impulse being directed so as to pass through the workpiece to the second electroacoustic transducer; detecting the impulse with the second electroacoustic transducer; detecting a delayed image of the impulse with the second electroacoustic transducer; generating a first signal that is proportional to the elapsed time between the generation of the impulse by the first electroacoustic transducer and the detection of the impulse by the second electroacoustic transducer; generating a second signal that is proportional to the elapsed time between the detection of the impulse by the second electroacoustic transducer and the detection of the delayed image of the impulse by the second electroacoustic transducer, the second signal thereby being proportional to the time required for sound to travel through the workpiece; generating a third signal that is proportional to the time required for sound to travel through the medium for the predetermined distance; and generating a signal that is proportional to the velocity of sound in the workpiece by combining the first, second and third signals according to a predetermined algebraic relationship.
Claim 8
Independent Claim
218 words
A method for determining the velocity of sound in a workpiece that is positioned between first and second electroacoustic transducers that are spaced a predetermined distance in a sound transmitting medium comprising the steps of generating an acoustic impulse with the first electroacoustic transducer, the impulse being directed so as to pass through the workpiece to the second electroacoustic transducer; detecting the impulse with the second electroacoustic transducer; detecting a delayed image of the impulse with the second electroacoustic transducer; generating a first signal that is proportional to the elapsed time between the generation of the impulse by the first electroacoustic transducer and the detection of the impulse by the second electroacoustic transducer; generating a second signal that is proportional to the elapsed time between the detection of the impulse by the second electroacoustic transducer and the detection of the delayed image of the impulse by the second electroacoustic transducer, the second signal thereby being proportional to the time required for sound to travel through the workpiece; generating a third signal that is proportional to the time required for sound to travel through the medium for the predetermined distance; and generating a signal that is proportional to the velocity of sound in the workpiece by combining the first, second and third signals according to a predetermined algebraic relationship.
Claim 9
Independent Claim
238 words
A method for determining the velocity of sound in a workpiece that is positioned between first and second electroacoustic transducers that are spaced a predetermined distance in a sound transmitting medium, comprising the steps of generating an acoustic impulse with the first electroacoustic transducer and directed so as to pass through the workpiece to the second electroacoustic transducer; detecting the impulse with the second electroacoustic transducer; detecting a delayed image of the impulse with the second electroacoustic transducer; generating a first signal that is proportional to the elapsed time between the generation of the impulse by the first electroacoustic transducer and the detection of the impulse by the second electroacoustic transducer; generating a second signal that is proportional to the elapsed time between the detection of the impulse by the second electroacoustic transducer and the detection of the delayed image of the impulse by the second electroacoustic transducer, the second signal being proportional to the time required for sound to pass through the workpiece, generating a third signal that is proportional to the time which is required for sound to travel through the medium for the predetermined distance; generating a fourth signal that is proportional to the thickness of the workpiece by algebraically summing the first, second and third signals; and generating a signal that is proportional to the velocity of sound in the workpiece by combining the second and fourth signals according to a predetermined algebraic relationship.
Claim 10
Independent Claim
238 words
A method for determining the velocity of sound in a workpiece that is positioned between first and second electroacoustic transducers that are spaced a predetermined distance in a sound transmitting medium, comprising the steps of generating an acoustic impulse with the first electroacoustic transducer and directed so as to pass through the workpiece to the second electroacoustic transducer; detecting the impulse with the second electroacoustic transducer; detecting a delayed image of the impulse with the second electroacoustic transducer; generating a first signal that is proportional to the elapsed time between the generation of the impulse by the first electroacoustic transducer and the detection of the impulse by the second electroacoustic transducer; generating a second signal that is proportional to the elapsed time between the detection of the impulse by the second electroacoustic transducer and the detection of the delayed image of the impulse by the second electroacoustic transducer, the second signal being proportional to the time required for sound to pass through the workpiece, generating a third signal that is proportional to the time which is required for sound to travel through the medium for the predetermined distance; generating a fourth signal that is proportional to the thickness of the workpiece by algebraically summing the first, second and third signals; and generating a signal that is proportional to the velocity of sound in the workpiece by combining the second and fourth signals according to a predetermined algebraic relationship.
Claim 11
Independent Claim
229 words
A method for determining the velocity of sound in a workpiece that is positioned between first and second crystals that are spaced a predetermined distance in a sound transmitting medium comprising the steps of genErating an acoustic impulse with the first crystal, the impulse being directed so as to pass through the workpiece to the sound crystal; detecting the impulse with the second crystal; detecting a delayed image of the impulse with the second crystal; generating a first signal that is proportional to the elapsed time between the generation of the impulse by the first crystal and the detection of the impulse by the second crystal; generating a second signal that is proportional to the elapsed time between the detection of the impulse by the second crystal and the detection of the delayed image of the impulse to the second crystal, the second signal being proportional to the time required for sound to pass through the workpiece; generating a third signal that is proportional to the time which is required for sound to travel through the medium for the predetermined distance; generating a fourth signal that is proportional to the thickness of the workpiece by algebraically summing the first, second and the third signals; and generating a signal that is proportional to the velocity of sound in the workpiece by algebraically dividing the fourth signal by the second signal.
Claim 12
Independent Claim
229 words
A method for determining the velocity of sound in a workpiece that is positioned between first and second crystals that are spaced a predetermined distance in a sound transmitting medium comprising the steps of genErating an acoustic impulse with the first crystal, the impulse being directed so as to pass through the workpiece to the sound crystal; detecting the impulse with the second crystal; detecting a delayed image of the impulse with the second crystal; generating a first signal that is proportional to the elapsed time between the generation of the impulse by the first crystal and the detection of the impulse by the second crystal; generating a second signal that is proportional to the elapsed time between the detection of the impulse by the second crystal and the detection of the delayed image of the impulse to the second crystal, the second signal being proportional to the time required for sound to pass through the workpiece; generating a third signal that is proportional to the time which is required for sound to travel through the medium for the predetermined distance; generating a fourth signal that is proportional to the thickness of the workpiece by algebraically summing the first, second and the third signals; and generating a signal that is proportional to the velocity of sound in the workpiece by algebraically dividing the fourth signal by the second signal.
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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |