Patent US3754472A successfully refreshed from Google Patents.
US3754472A
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Apparatus for analysing by means of ultrasonic pulses, employing the reflecting profile characteristic of each obstacle
Assignee: Realisations Ultrasoniques SA
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Filing: 1971-03-04
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Granted: 1973-08-28
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Expires: 1991-03-04
Abstract
Abstract For analyzing discontinuities which perturb the propagation of acoustical waves in a given medium, in particular for detecting flaws in a mechanical piece, there is provided an apparatus comprising means for dividing each of the echo signals reflected from the discontinuity into a plurality of elementary signals having predetermined relative amplitude and time delays and means for establishing the sum of said elementary signals. The position, shape and dimensions of the discontinuity are determined with better precision than in conventional devices.
Inventors
- 👤 J Dory
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:31
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/44; G01N29/4409; G01N29/4427; G01N29/04; G01N29/07; G01N29/11; G01N29/36; G01N29/38; G01N29/40; G01N29/46; G01S; G01S15/00; G01S15/02; G01S15/04; G01N2291/00; G01N2291/04; G01N2291/044
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
207 words
Apparatus for analyzing discontinuities or obstacles which perturb the propagation of acoustical waves in a given medium, said apparatus comprising means for directing a beam of waves corresponding to brief repetitive acoustical signals towards the obstacle to be analyzed; receiver means for receiving said beam of waves after transmission through the medium containing the obstacle; further means for producing from each of the acoustical signals which form the received beam of waves a plurality of elementary signals each one of which possesses, relative to the other, elementary signals, a predetermined relative amplitude and time delay; mixer means for establishing the sum of said elementary signals, and read-out means connected to the output of said mixer means, the said further means being so determined that the respective time delays and amplitudes of the elementary signals are such that if y is the time delay of an elementary signal, r (y) a factor by which its amplitude is multiplied and f (t) the amplitude of the acoustic signal at the time t when it is directed towards the obstacle, the function r (y) is calculated from a formula having the form rp 1/fp, rp and fp being the Laplace transformed functions for the functions r (y) and f (t).
Claim 2
Dependent Claim
207 words
Apparatus for analyzing discontinuities or obstacles which perturb the propagation of acoustical waves in a given medium, said apparatus comprising means for directing a beam of waves corresponding to brief repetitive acoustical signals towards the obstacle to be analyzed; receiver means for receiving said beam of waves after transmission through the medium containing the obstacle; further means for producing from each of the acoustical signals which form the received beam of waves a plurality of elementary signals each one of which possesses, relative to the other, elementary signals, a predetermined relative amplitude and time delay; mixer means for establishing the sum of said elementary signals, and read-out means connected to the output of said mixer means, the said further means being so determined that the respective time delays and amplitudes of the elementary signals are such that if y is the time delay of an elementary signal, r (y) a factor by which its amplitude is multiplied and f (t) the amplitude of the acoustic signal at the time t when it is directed towards the obstacle, the function r (y) is calculated from a formula having the form rp 1/fp, rp and fp being the Laplace transformed functions for the functions r (y) and f (t).
Claim 3
Dependent Claim
79 words
Apparatus as claimed in claim 1 wherein said further means comprise: a delay line having a plurality of taps, said delay line having an input connected to the output of said receiver means and a plurality of adjustable resistors connecting the respective taps to the input of said mixEr means, the distribution of respective taps along the delay line and the resistance values of the respective resistors being so determined that predetermined relative amplitudes and time delays are obtained.
Claim 4
Dependent Claim
79 words
Apparatus as claimed in claim 1, wherein said transmitter-receiver further means include a magnetostrictive transducer having an elongate magnetostrictive element and a plurality of coils distributed along said element; said further means further including a plurality of adjustable resistors connecting the respective coils to the input of the mixer means, the distribution of the respective coils along said element and the resistance values of the respective resistors being so determined that predetermined relative amplitudes and time delays are obtained.
Claim 5
Dependent Claim
78 words
Apparatus as claimed in claim 1, wherein said transmitter and receiver means include an ultrasonic transmitter-receiver transducer having a first face in contact with said medium and an opposite face; said further means including a block of material absorbing the ultrasounds placed against said opposite face; the said respective distances being so determined that predetermined relative amplitudes and time delays are obtained, said first face of the transmitter-receiver transducer being connected at the input of the mixer means.
Claim 6
Dependent Claim
107 words
Apparatus as claimed in claim 1, wherein said transmitter and receiver means include an ultrasonic transmitter-receiver transducer having a first face in contact with said medium and an opposite face; said further means including: a block of material absorbing ultrasounds against the opposite face, a plurality of ultrasonic receiver transducers incorporated in said block at predetermined respective distances from said opposite face, and a plurality of adjustable resistors connecting the respective receiver transducers to the input of said mixer means, the respective distances of the receiver transducers and the resistance values of the respective resistors being so determined that predetermined relative amplitudes and time delays are obtained.
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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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |