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Patent US5367378A successfully refreshed from Google Patents.
US5367378A
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Assignee: Brückner Maschinenbau GmbH
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Filing: 1993-06-01
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Granted: 1994-11-22
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Expires: 2013-06-01
Abstract
Abstract A method of evaluating defects in a surface as compared with a reference surface by providing a surface for defect evaluation, illuminating and projecting a pattern of lines on the surface having a periodic configuration with features having a separation period, providing a camera for recording a reflected image of the pattern of lines projected and reflected from the surface, and evaluating and quantifying the image by calculating a slope of a defect observed by the camera using a specified relationship. The distance between the illuminated pattern and the surface are used to calculate the defect slope and a defect depth value is generated using a specified relationship dependent on length of a defect area visually recognizable from the reflected image and the calculated defect slope.
Inventors
- 👤 Kevin G. Harding
- 👤 Albert J. Boehnlein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:01
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/8806; G01B; G01B11/00; G01B11/30; G01B11/306
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
116 words
A method of evaluating defects in a surface for evaluation as compared with a reference surface, comprising the steps of: providing said surface for evaluation; providing illumination means for providing a pattern of lines having a periodic configuration having features having a separation period(P) which can be projected on said surface for evaluation; providing a camera for recording an image of said pattern of lines as reflected from said surface; quantifying said image by calculating a slope of a defect observed by said camera using the relationship; slope=tan -1 (Period)/2D where D is the distance between said illumination means and said surface; and generating a defect depth value using the relationship; Defect Depth=(length of defect area)/2(slope).
Claim 2
Independent Claim
116 words
A method of evaluating defects in a surface for evaluation as compared with a reference surface, comprising the steps of: providing said surface for evaluation; providing illumination means for providing a pattern of lines having a periodic configuration having features having a separation period(P) which can be projected on said surface for evaluation; providing a camera for recording an image of said pattern of lines as reflected from said surface; quantifying said image by calculating a slope of a defect observed by said camera using the relationship; slope=tan -1 (Period)/2D where D is the distance between said illumination means and said surface; and generating a defect depth value using the relationship; Defect Depth=(length of defect area)/2(slope).
Claim 3
Independent Claim
119 words
A method of evaluating defects in a surface for evaluation as compared with a reference surface, comprising the steps of: providing said surface for evaluation; providing illumination means for providing a pattern of lines having a periodic configuration having features having a separation period(P) which can be projected on said surface for evaluation; providing a camera for recording an image of said pattern of lines as reflected from said surface; and quantifying said image by calculating a value of the extent to which said image of said lines as reflected from said surface deviates from an ideal shape of said line wherein said value is scaled in relation to a distance (D) between said illumination means and said surface.
Claim 4
Independent Claim
119 words
A method of evaluating defects in a surface for evaluation as compared with a reference surface, comprising the steps of: providing said surface for evaluation; providing illumination means for providing a pattern of lines having a periodic configuration having features having a separation period(P) which can be projected on said surface for evaluation; providing a camera for recording an image of said pattern of lines as reflected from said surface; and quantifying said image by calculating a value of the extent to which said image of said lines as reflected from said surface deviates from an ideal shape of said line wherein said value is scaled in relation to a distance (D) between said illumination means and said surface.
References Cited (Backward Citations)
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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) | 1997-11-21 | 1998-05-23 | 1998-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-11-21 | 2002-05-23 | 2002-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-11-21 | 2006-05-23 | 2006-11-22 | $7700.00 | Window Closed / Lapsed |