US4536654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for detecting flaws on a piece
Assignee: Safran Aircraft Engines SAS
•
Filing: 1983-04-21
•
Granted: 1985-08-20
•
Expires: 2003-04-21
Abstract
Abstract A device automatically reads indications of flaws in a piece using the swing method. An ultraviolet beam illuminates the piece to be checked after successive reflections on a separating mirror and on two oscillating mirrors for sweeping. The beam reemitted parallel to the incident beam traverses the separating mirror and is received by a detector, the output information of which is transmitted to a data processing unit which also receives information on the position of the oscillating mirror over a different path.
Inventors
- 👤 Jean F. Vaerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:18
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/62; G01N21/63; G01N21/64
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
231 words
In a device for detecting flaws on a piece by the automatic reading of indications representative of the flaws to be detected which indications are given by a liquid which, under the action of a light of a first wavelength, emits a radiation of light of a second wavelength, said device being of the type having a source which emits a beam of light of the first wavelength which illuminates the piece to be studied, after said first wavelength beam is reflected by a separating mirror which separating mirror reflects said light of the first wavelength and passes said light of the second wavelength, and with a portion of the light of said second wavelength emitted by said liquid forming a beam which is parallel to and in the opposite direction from said beam of light of the first wavelength reflected by said separating mirror and with said second wavelength beam being detected by a detector, the improvement comprising: said source emitting a focused beam; and first and second oscillating mirrors placed between said separating mirror and said piece to simultaneously assure on the one hand the sweeping of the piece along two coordinate axes by the first wavelength beam and on the other hand the directing onto the detector of said second wavelength beam emitted by said liquid parallel to and in the opposite direction from said first wavelength beam.
Claim 2
Dependent Claim
231 words
In a device for detecting flaws on a piece by the automatic reading of indications representative of the flaws to be detected which indications are given by a liquid which, under the action of a light of a first wavelength, emits a radiation of light of a second wavelength, said device being of the type having a source which emits a beam of light of the first wavelength which illuminates the piece to be studied, after said first wavelength beam is reflected by a separating mirror which separating mirror reflects said light of the first wavelength and passes said light of the second wavelength, and with a portion of the light of said second wavelength emitted by said liquid forming a beam which is parallel to and in the opposite direction from said beam of light of the first wavelength reflected by said separating mirror and with said second wavelength beam being detected by a detector, the improvement comprising: said source emitting a focused beam; and first and second oscillating mirrors placed between said separating mirror and said piece to simultaneously assure on the one hand the sweeping of the piece along two coordinate axes by the first wavelength beam and on the other hand the directing onto the detector of said second wavelength beam emitted by said liquid parallel to and in the opposite direction from said first wavelength beam.
Claim 3
Dependent Claim
24 words
Device for detecting flaws according to claim 1, wherein said first wavelength corresponds to ultraviolet light and said second wavelength corresponds to visible light.
Claim 4
Dependent Claim
39 words
Device for detecting flaws according to any one of claims 1 and 2, wherein said detector outputs a signal to a data processing unit which also receives information on the position of said oscillating mirrors over a different path.
Claim 5
Dependent Claim
45 words
Device for detecting flaws according to any one of claims 1 and 2, further comprising a filter means placed between said separating mirror and said detector which allows the light of the second wavelength to pass and blocks the residual rays of the first wavelength.
Claim 6
Dependent Claim
18 words
Device for detecting flaws according to any one of claims 1 and 2, wherein said source is monochromatic.
Claim 7
Dependent Claim
20 words
Device for detecting flaws according to any one of claims 1 and 2, wherein, said source is an ultraviolet lamp.
Claim 8
Dependent Claim
15 words
Device for detecting flaws according to claim 1, wherein said source is a laser device.
References Cited (Backward Citations)
US3774030A
Cited
US4087685A
Cited
US4284897A
Cited
US4162405A
Cited
GB2044921A
Cited
EP0050935A1
Cited
US4428672A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-19 | 1989-02-18 | 1989-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-19 | 1993-02-18 | 1993-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-19 | 1997-02-18 | 1997-08-20 | $7700.00 | Window Closed / Lapsed |