LU81728A1 - PROCESS FOR CONTROLLING THE QUALITY OF COATED OR NON-COATED SURFACES - Google Patents
PROCESS FOR CONTROLLING THE QUALITY OF COATED OR NON-COATED SURFACES Download PDFInfo
- Publication number
- LU81728A1 LU81728A1 LU81728A LU81728A LU81728A1 LU 81728 A1 LU81728 A1 LU 81728A1 LU 81728 A LU81728 A LU 81728A LU 81728 A LU81728 A LU 81728A LU 81728 A1 LU81728 A1 LU 81728A1
- Authority
- LU
- Luxembourg
- Prior art keywords
- light
- reflected
- cone
- opening angle
- quality
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 12
- 238000009826 distribution Methods 0.000 claims description 2
- 239000013307 optical fiber Substances 0.000 claims description 2
- 238000005259 measurement Methods 0.000 description 3
- 235000019592 roughness Nutrition 0.000 description 3
- 239000002184 metal Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000004304 visual acuity Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/30—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces
- G01B11/303—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces using photoelectric detection means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Description
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C 1975/7909.C 1975/7909.
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i i | CENTRE DE RECHERCHES METALLURGIQUES - 1' CENTRUM V00R RESEARCH IN DE METALLURGIE, ! Association sans but lucratif - Vereniging zonder winstoogmerk i ! à BRUXELLES, (Belgique) .i i | METALLURGICAL RESEARCH CENTER - 1 'CENTRUM V00R RESEARCH IN DE METALLURGIE,! Non-profitmaking organization - Vereniging zonder winstoogmerk i! in BRUXELLES, (Belgium).
! ί —---—-- “ * 'J Procédé pour contrôler la qualité des surfaces revêtues ou non.! ί —---—-- “* 'J Process to control the quality of coated or uncoated surfaces.
* i- " i; La présente invention est relative à un procédé pour contrôler, de façon rapide et continue, la qualité des surfaces revêtues ou non.* i- "i; The present invention relates to a method for quickly and continuously controlling the quality of coated or uncoated surfaces.
En ce qui concerne les surfaces revêtues et notamment les surfaces métalliques peintes que l'on produit en grandes quantités en carrosserie automobile, il faut que les différentes surfaces d'un assemblage non seulement soient les plus brillantes possibles, mais aussi possèdent la même brillance pour  « 2.- que leur qualité soit considérée comme satisfaisante. Il est donc nécessaire de pouvoir juger de la brillance d'une surface peinte, indépendamment de la couleur utilisée,pour contrôler de telles productions.With regard to coated surfaces and in particular painted metal surfaces which are produced in large quantities in automobile bodywork, the different surfaces of an assembly must not only be as shiny as possible, but also have the same gloss for  “2.- that their quality is considered satisfactory. It is therefore necessary to be able to judge the gloss of a painted surface, regardless of the color used, to control such productions.
Dans ce domaine, on a déjà utilisé des méthodes basées sur le pouvoir de résolution de la surface peinte employée comme miroir. Cependant, les résultats ainsi obtenus dépendent de l'appréciation de l'opérateur avec tous les inconvénients bien connus d'une pratique de ce genre.In this area, methods have already been used based on the resolving power of the painted surface used as a mirror. However, the results thus obtained depend on the operator's appreciation with all the well-known drawbacks of a practice of this kind.
En ce qui concerne les surfaces non revêtues et notamment celles des tôles métalliques, dont la surface se présente à l'échelle microscopique sous la forme d'une succession de pics et de vallées, on sait que leur morphologie dont on connaît l'importance, est caractérisée par différents paramètres tels que rugosité arithmétique moyenne, nombre de pics par unité de longueur, longueur moyenne de plateaux et de vallées que l'on ne peut obtenir qu'après des mesures relativement délicates.With regard to uncoated surfaces and in particular those of metal sheets, the surface of which is presented on a microscopic scale in the form of a succession of peaks and valleys, it is known that their morphology, the importance of which is known, is characterized by different parameters such as average arithmetic roughness, number of peaks per unit of length, average length of plateaus and valleys that can only be obtained after relatively delicate measurements.
La présente invention a pour objet un procédé permettant de remédier aux inconvénients mentionnés ci-dessus.The present invention relates to a method making it possible to remedy the drawbacks mentioned above.
Le procédé, objet de la présente invention, est essentiellement caractérisé en ce que l'on dirige vers la surface un faisceau lumineux du type laser de faible puissance sous une * incidence de préférence oblique, en ce que l'on détermine, dans des conditions appropriées, l'angle du cône de lumière réfléchie et en ce que l'on en déduit la qualité de la dite surface en ce sens qu'à un plus grand angle d'ouverture correspond une plus grande irrégularité de la surface.The process which is the subject of the present invention is essentially characterized in that a light beam of the low-power laser type is directed towards the surface under a preferably oblique incidence, in that it is determined under conditions appropriate, the angle of the cone of reflected light and in that the quality of said surface is deduced therefrom in the sense that at a larger opening angle corresponds a greater irregularity of the surface.
On a constaté en effet que dans le cas des surfaces peintes, l'angle d'ouverture du cône de lumière réfléchie est d’autant plus grand que la surface est moins brillante. Un I tel angle peut atteindre des valeurs de 2 à 3 degrés.It has in fact been found that in the case of painted surfaces, the opening angle of the cone of reflected light is greater the less the surface is shiny. Such an angle can reach values of 2 to 3 degrees.
j * 3.- Μ i Dans le cas des surfaces non revêtues, l'angle I d'ouverture du cône de lumière réfléchie qui peut atteindre des valeurs de l'ordre de 10 degrés est d'autant plus grand que : - la rugosité est grande, - le nombre de pics par unité de longueur est grand, - la longueur moyenne des pics et vallées est petite.j * 3.- Μ i In the case of uncoated surfaces, the angle I of the cone of reflected light which can reach values of the order of 10 degrees is all the greater as: - the roughness is large, - the number of peaks per unit of length is large, - the average length of peaks and valleys is small.
Suivant une modalité de l'invention, on détermine l'angle d'ouverture du cône de lumière réfléchie en mesurant l'ouverture angulaire correspondant à un certain pourcentage de 4 lumière réfléchie. A cette fin par exemple, on intercepte le cône de lumière réfléchie par un écran et on mesure, de façon manuelle ou automatique, les dimensions de la tache de lumière correspondant au dit pourcentage de l'intensité réfléchie totale. Plus ces dimensions sont petites et plus la surface examinée est brillante ou lisse.According to a modality of the invention, the opening angle of the cone of reflected light is determined by measuring the angular opening corresponding to a certain percentage of 4 reflected light. For this purpose, for example, the cone of light reflected by a screen is intercepted and the dimensions of the light spot corresponding to said percentage of the total reflected intensity are measured manually or automatically. The smaller these dimensions, the brighter or smoother the surface examined.
Suivant une autre modalité de l'invention, on mesure le pourcentage de lumière réfléchie dans un cône de faible valeur d'ouverture angulaire, par exemple 0,2 degré, coaxial au cône de réflexion. Dans ce cas, plus l'intensité mesurée est grande et plus la surface examinée est brillante ou lisse.According to another embodiment of the invention, the percentage of light reflected in a cone of low angular aperture value, for example 0.2 degrees, is measured coaxially with the reflection cone. In this case, the greater the intensity measured, the brighter or smoother the surface examined.
La présente invention a également pour objet un dispositif destiné à la mise en oeuvre du procédé décrit ci-dessus.The present invention also relates to a device intended for the implementation of the method described above.
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Le dispositif, objet de la présente invention, est essentiellement caractérisé en ce qu'il comprend : - une source lumineuse du type laser de faible puissance, fonc tionnant en continu, - des moyens pour fixer, de façon précise, la direction du faisceau réfléchi ou pour corriger cette direction en cas de nécessité, - des moyens pour déterminer l'angle d’ouverture du cône de | lumière réfléchie par mesure soit d'intensité lumineuse soit f de dimensions d'une tache lumineuse, soit de distribution d' i intensité dans la tache lumineuse.The device, object of the present invention, is essentially characterized in that it comprises: - a light source of the low-power laser type, operating continuously, - means for precisely fixing the direction of the reflected beam or to correct this direction if necessary, - means for determining the opening angle of the cone of | light reflected by measuring either the light intensity or the dimensions of a light spot, or the distribution of i intensity in the light spot.
' Λ 4.-'Λ 4.-
Les moyens destinés à fixer, de façon précise la direction du faisceau réfléchi peuvent être constitués par exemple d'un appui pour la surface peinte ou pour la cellule de mesure sur la surface peinte. Ils peuvent encore être constitués de miroirs effectuant automatiquement les corrections de position du faisceau réfléchi. Par exemple des miroirs mobiles commandés par des cellules photosensibles qui détectent la position du faisceau réfléchi.The means intended to fix the direction of the reflected beam precisely can consist, for example, of a support for the painted surface or for the measurement cell on the painted surface. They can also be made up of mirrors which automatically correct the position of the reflected beam. For example mobile mirrors controlled by photosensitive cells which detect the position of the reflected beam.
Les moyens pour déterminer l'angle d'ouverture du cône de lumière réfléchie peuvent être constitués d'une caméra de télévision associée à un analyseur d'image qui scrute la tache s* de lumière réfléchie formée sur un écran et qui détermine la surface des plages correspondant à des niveaux d'éclairement différents.The means for determining the opening angle of the cone of reflected light may consist of a television camera associated with an image analyzer which examines the spot of reflected light formed on a screen and which determines the surface of the ranges corresponding to different levels of illumination.
Eventuellement, le dispositif comprend en outre des moyens tels que des fibres optiques pour transmettre la lumière d'endroits difficilement accessibles aux moyens de mesure.Optionally, the device also comprises means such as optical fibers for transmitting light from places which are difficult to access to the measuring means.
Dans le cas des surfaces non revêtues, le domaine d'application de l'invention s'étend à des rugosités allant de 0,8 à 2,5 micromètres. Elle permet d'effectuer le contrôle des surfaces usinées et en ce qui concerne les tôles laminées, elle permet de mesurer en continu les caractéristiques superficielles à la sortie du laminoir, ainsi que de réagir rapidement sur les conditions de laminage si les mesures ne correspondent pas aux .-* consignes prédéterminées.In the case of uncoated surfaces, the field of application of the invention extends to roughnesses ranging from 0.8 to 2.5 micrometers. It makes it possible to carry out the control of the machined surfaces and with regard to the rolled sheets, it makes it possible to continuously measure the surface characteristics at the outlet of the rolling mill, as well as to react quickly to the rolling conditions if the measurements do not correspond to .- * predetermined instructions.
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Claims (6)
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU81728A LU81728A1 (en) | 1979-09-26 | 1979-09-26 | PROCESS FOR CONTROLLING THE QUALITY OF COATED OR NON-COATED SURFACES |
| IT68416/80A IT1129905B (en) | 1979-09-26 | 1980-09-15 | PROCEDURE FOR CHECKING THE QUALITY OF COATED OR UNCOATED SURFACES |
| DE19803035491 DE3035491A1 (en) | 1979-09-26 | 1980-09-19 | METHOD FOR TESTING THE QUALITY OF SURFACES |
| BE6/47271A BE885377A (en) | 1979-09-26 | 1980-09-24 | PROCESS FOR CONTROLLING THE QUALITY OF COATED OR NON-COATED SURFACES |
| FR8021363A FR2465993A1 (en) | 1979-09-26 | 1980-09-25 | Optical investigation of surface reflective properties - measuring included angle of light beam reflected from painted or bare metal panel to assess finish |
| JP13419180A JPS5658646A (en) | 1979-09-26 | 1980-09-25 | Method of controlling quality of surface covered or not covered |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU81728A LU81728A1 (en) | 1979-09-26 | 1979-09-26 | PROCESS FOR CONTROLLING THE QUALITY OF COATED OR NON-COATED SURFACES |
| LU81728 | 1979-09-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU81728A1 true LU81728A1 (en) | 1981-04-17 |
Family
ID=19729253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU81728A LU81728A1 (en) | 1979-09-26 | 1979-09-26 | PROCESS FOR CONTROLLING THE QUALITY OF COATED OR NON-COATED SURFACES |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS5658646A (en) |
| BE (1) | BE885377A (en) |
| DE (1) | DE3035491A1 (en) |
| FR (1) | FR2465993A1 (en) |
| IT (1) | IT1129905B (en) |
| LU (1) | LU81728A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3248782A1 (en) * | 1982-12-31 | 1984-07-05 | Feldmühle AG, 4000 Düsseldorf | Method and device for testing surfaces |
| DE3305284A1 (en) * | 1983-02-16 | 1984-08-23 | Siemens AG, 1000 Berlin und 8000 München | Contactless measurement of the gloss of surfaces and coatings |
| DE19549233C2 (en) * | 1995-01-06 | 1998-02-26 | Ver Energiewerke Ag | Method and arrangement for non-destructive material testing by means of a structural impression on a component subject to creep stress under preferably on-site conditions, e.g. B. in a power plant |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2720812A (en) * | 1952-09-30 | 1955-10-18 | Middleton William Edga Knowles | Instrument for measuring distinctness of image gloss |
| US3388259A (en) * | 1965-03-22 | 1968-06-11 | Gen Precision Systems Inc | Photosensitive surface finish indicator |
| CH552197A (en) * | 1972-11-24 | 1974-07-31 | Bbc Brown Boveri & Cie | DEVICE FOR MEASURING THE ROUGHNESS OF A SURFACE. |
| GB1592511A (en) * | 1977-05-18 | 1981-07-08 | Ferranti Ltd | Surface inspection apparatus |
-
1979
- 1979-09-26 LU LU81728A patent/LU81728A1/en unknown
-
1980
- 1980-09-15 IT IT68416/80A patent/IT1129905B/en active
- 1980-09-19 DE DE19803035491 patent/DE3035491A1/en not_active Withdrawn
- 1980-09-24 BE BE6/47271A patent/BE885377A/en not_active IP Right Cessation
- 1980-09-25 FR FR8021363A patent/FR2465993A1/en active Granted
- 1980-09-25 JP JP13419180A patent/JPS5658646A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| FR2465993B3 (en) | 1982-07-23 |
| BE885377A (en) | 1981-01-16 |
| IT8068416A0 (en) | 1980-09-15 |
| JPS5658646A (en) | 1981-05-21 |
| IT1129905B (en) | 1986-06-11 |
| FR2465993A1 (en) | 1981-03-27 |
| DE3035491A1 (en) | 1981-04-16 |
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