Patent US3756071A successfully refreshed from Google Patents.
US3756071A
Expired / Lapsed
US
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Process and apparatus for analyzing materials by means of ultrasonic pulses, employing the transfer function characteristic of each obstacle
Assignee: Realisations Ultrasoniques SA
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Filing: 1971-03-01
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Granted: 1973-09-04
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Expires: 1991-03-01
Abstract
Abstract For analysing an obstacle which perturbs the propagation of ultrasonic waves in a medium in particular a flaw in a mechanical part, an apparatus is provided, which comprises transmitter and transducer units directing towards the obstacle a beam of ultrasonic pulsed waves comprising a plurality of frequency components and a receiver with cathode-ray tube displaying the relative amplitudes of the respective frequency components in the ultrasonic energy reflected from the obstacle. The apparatus provides accurate information as regards the position shape and dimensions of the obstacle.
Inventors
- 👤 J Dory
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:27
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/34; G01N29/348
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
187 words
An apparatus for analyzing discontinuities or obstacles which perturb the propagation of acoustical waves in a given medium, comprising means for directing towards the obstacles to be analyzed a beam of waves corresponding to brief acoustical signals transmitted in repetitive groups and having a carrier frequency which varies in accordance with a predetermined law within anyone of said groups; receiver means for receiving the said signals after propagation into the medium along a path containing the obstacles, the received signals comprising a plurality of different frequency components, said receiver means comprising means for automatically correcting the frequency response curve thereof to provide output signals of constant amplitude when it receives the signals formed on a reference obstacle; said apparatus further comprising display means with vertical deflection and horizontal deflection, means synchronizing the horizontal deflection with the respective transmitted signals, means synchronizing the vertical deflection with the variation of the carrier frequency, whereby a visual representation of the received signals is formed by line-by-line sweeping, and means for modulating a parameter which is characteristic of the display as a function of the amplitudes of the said received signals.
Claim 2
Independent Claim
187 words
An apparatus for analyzing discontinuities or obstacles which perturb the propagation of acoustical waves in a given medium, comprising means for directing towards the obstacles to be analyzed a beam of waves corresponding to brief acoustical signals transmitted in repetitive groups and having a carrier frequency which varies in accordance with a predetermined law within anyone of said groups; receiver means for receiving the said signals after propagation into the medium along a path containing the obstacles, the received signals comprising a plurality of different frequency components, said receiver means comprising means for automatically correcting the frequency response curve thereof to provide output signals of constant amplitude when it receives the signals formed on a reference obstacle; said apparatus further comprising display means with vertical deflection and horizontal deflection, means synchronizing the horizontal deflection with the respective transmitted signals, means synchronizing the vertical deflection with the variation of the carrier frequency, whereby a visual representation of the received signals is formed by line-by-line sweeping, and means for modulating a parameter which is characteristic of the display as a function of the amplitudes of the said received signals.
Claim 3
Dependent Claim
49 words
An apparatus as claimed in claim 1, wherein said visual representation is obtained on the screen of a cathode-ray tube, said characteristic parameter of the display being the light intensity modulated in an all-or-nothing way by said signal which is a function of the intensity of the signals received.
Claim 4
Dependent Claim
31 words
Apparatus as claimed in claim 2, wherein said signal which is a function of the amplitude of the signals received is a rectangular signal having a width proportional to said intensity.
Claim 5
Dependent Claim
51 words
An apparatus as claimed in claim 1, wherein said visual representation is obtained on the screen of a cathode-ray tube, said parameter characteristic of the display being the vertical deflection voltage of said cathode-ray tube which is modulated by a signal having an amplitude proportional to that of said signals received.
Claim 6
Dependent Claim
24 words
An apparatus as claimed in claim 1, further comprising means for increasing the recurrent frequency of said repetitive groups as their carrier frequency increases.
Claim 7
Dependent Claim
26 words
An appAratus as claimed in claim 1, wherein said receiver means comprise shaping means adapted for eliminating the leading and trailing edges of the received signals.
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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |