Patent DE449886C successfully refreshed from Google Patents.
US4052889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for measurement of subsurface fatigue crack size
Assignee: Adaptronics Inc
•
Filing: 1976-06-10
•
Granted: 1977-10-11
•
Expires: 1996-06-10
Abstract
Abstract A system for detecting and measuring subsurface fatigue cracks wherein acoustic pulse-echo data from the crack under test are manipulated to extract all acoustic characteristics by means of a Fourier operation, deconvolution and inverse Fourier operation, providing a spectral and cepstral analysis on these data and then utilizing the results of the spectral and cepstral analysis to obtain parameters which are utilized in an adaptive learning network to provide crack length measurements.
Inventors
- 👤 Anthony N. Mucciardi
- 👤 Ramesh Shankar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:21
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/44; G01N29/449; G01N29/34; G01N29/348; G01S; G01S7/00; G01S7/52; G01S7/523; G01S7/526; G01S7/527
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
80 words
A system for measurement of surface and subsurface material flaw size which comprises, a. means for obtaining data as a function of a flaw in a medium, b. means to perform spectral analysis on said data, c. means to perform a cepstral analysis on said data, d. means responsive to the output of both (b) and (c) to provide a set of parameters; and e. means responsive to predetermined ones of said parameters to provide an estimated flaw length indication
Claim 2
Independent Claim
80 words
A system for measurement of surface and subsurface material flaw size which comprises, a. means for obtaining data as a function of a flaw in a medium, b. means to perform spectral analysis on said data, c. means to perform a cepstral analysis on said data, d. means responsive to the output of both (b) and (c) to provide a set of parameters; and e. means responsive to predetermined ones of said parameters to provide an estimated flaw length indication
Claim 3
Dependent Claim
37 words
A system as set forth in claim 1, wherein said means in (a) is an acoustic means and said data is an analog function of time and angle between said acoustic means and a flaw under test.
Claim 4
Dependent Claim
18 words
A system as set forth in claim 2 further including means to digitally store said data from (a).
Claim 5
Dependent Claim
26 words
A system as set forth in claim 3 further including manipulator means coupled to said means to store for eliminating acoustic characteristics in said stored data.
Claim 6
Dependent Claim
46 words
A system as set forth in claim 4, wherein said manipulator means includes means to take a Fourier transform of said stored data and reference data, means to take a deconvolution of said Fourier transforms and means to take an inverse Fourier transform of said deconvolution.
Claim 7
Dependent Claim
43 words
A system as set forth in claim 5, wherein said means in (b) includes means to take a Fourier transform and said means in (c) includes means to take a natural logarithm and means to take a Fourier transform of said natural logarithm.
Claim 8
Dependent Claim
18 words
A system as set forth in claim 6, wherein said acoustic means is a plurality of ultrasonic transducers.
Claim 9
Dependent Claim
18 words
A system as set forth in claim 7, wherein said means in (e) is an adaptive learning network.
Claim 10
Dependent Claim
18 words
A system as set forth in claim 6, wherein said means in (e) is an adaptive learning network.
Claim 11
Dependent Claim
18 words
A system as set forth in claim 5, wherein said means in (e) is an adaptive learning network.
Claim 12
Dependent Claim
43 words
A system as set forth in claim 4, wherein said means in (b) includes means to take a Fourier transform and said means in (c) includes means to take a natural logarithm and means to take a Fourier transform of said natural logarithm.
Claim 13
Dependent Claim
18 words
A system as set forth in claim 4, wherein said means in (e) is an adaptive learning network.
Claim 14
Dependent Claim
43 words
A system as set forth in claim 3, wherein said means in (b) includes means to take a Fourier transform and said means in (c) includes means to take a natural logarithm and means to take a Fourier transform of said natural logarithm.
Claim 15
Dependent Claim
18 words
A system as set forth in claim 3, wherein said means in (e) is an adaptive learning netowrk.
Claim 16
Dependent Claim
43 words
A system as set forth in claim 2, wherein said means in (b) includes means to take a Fourier transform and said means in (c) includes means to take a natural logarithm and means to take a Fourier transform of said natural logarithm.
Claim 17
Dependent Claim
18 words
A system as set forth in claim 2, wherein said acoustic means is a plurality of ultrasonic transducers.
Claim 18
Dependent Claim
18 words
A system as set forth in claim 1 further including means to digitally store said data from (a).
Claim 19
Dependent Claim
26 words
A system as set forth in claim 17 further including manipulator means coupled to said means to store for eliminating acoustic characteristics in said stored data.
Claim 20
Dependent Claim
46 words
A system as set forth in claim 18, wherein said manipulator means includes means to take a Fourier transform of said stored data and reference data, means to take a deconvolution of said Fourier transforms and means to take an inverse Fourier transform of said deconvolution.
Claim 21
Dependent Claim
43 words
A system as set forth in claim 19, wherein said means in (b) includes means to take a Fourier transform and said means in (c) includes means to take a natural logarithm and means to take a Fourier transform of said natural logarihm.
Claim 22
Dependent Claim
43 words
A system as set forth in claim 18, wherein said means in (b) includes means to take a Fourier transform and said means in (c) includes means to take a natural logarithm and means to take a Fourier transform of said natural logarithm.
Claim 23
Dependent Claim
43 words
A system as set forth in claim 3, wherein said means in (b) includes means to take a Fourier transform and said means in (c) includes means to take a natural logarithm and means to take a Fourier transform of said natural logarithm.
Claim 24
Dependent Claim
43 words
A system as set forth in claim 1, wherein said means in (b) includes means to take a Fourier transform and said means in (c) includes means to take a natural logarithm and means to take a Fourier transform of said natural logarithm.
Claim 25
Dependent Claim
18 words
A system as set forth in claim 1, wherein said means in (e) is an adaptive learning network.
References Cited (Backward Citations)
US3961522A
Cited
US3924456A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |