EP0931255A1 - Dispositif pour le controle de surfaces mates planes et/ou courbes - Google Patents

Dispositif pour le controle de surfaces mates planes et/ou courbes

Info

Publication number
EP0931255A1
EP0931255A1 EP97913102A EP97913102A EP0931255A1 EP 0931255 A1 EP0931255 A1 EP 0931255A1 EP 97913102 A EP97913102 A EP 97913102A EP 97913102 A EP97913102 A EP 97913102A EP 0931255 A1 EP0931255 A1 EP 0931255A1
Authority
EP
European Patent Office
Prior art keywords
light
dark
arrangement according
dark edge
arrangement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP97913102A
Other languages
German (de)
English (en)
Inventor
Achim Willing
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dr Ing Willing GmbH
Original Assignee
Dr Ing Willing GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dr Ing Willing GmbH filed Critical Dr Ing Willing GmbH
Publication of EP0931255A1 publication Critical patent/EP0931255A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/8803—Visual inspection

Definitions

  • the invention relates to an arrangement for the inspection of matt flat and / or curved surfaces according to the preamble of the main claim.
  • test lights are provided which have a uniformly illuminated frosted glass pane with an inclined black stripe grid.
  • the test lights are arranged in such a way that this black stripe grid is "completely” reflected in the surface area to be checked.
  • This design of the test lights has the disadvantage that the contrast on the visual task is reduced due to the large number of strips, since they are not effective for the visual task
  • Streaks of light shine in and thus reduce the contrast.
  • the many stripes confuse the observer and the oblique arrangement of the stripes only gives a sharp image at certain points.
  • the invention is therefore based on the object of providing an arrangement for the inspection of matt flat and / or curved surfaces for the detection of faults, which permits clear fault detection on the surfaces.
  • the sensitivity can be increased by continuously or abruptly shifting the light-dark edge, preferably a light stripe, since the image of a contrast is stored in the memory of a person looking at it and when switching to another light-dark that is slightly shifted locally Edge can be used for comparison with the newly set light-dark edge. Since no disturbing lighting structures influence the contrast edge, a lower contrast (eg 1:30) can be used.
  • the measures specified in the subclaims make further advantageous developments and improvements possible.
  • FIG. 1 shows a schematic view of the arrangement according to the invention for inspection according to a first exemplary embodiment
  • FIG. 2 shows a schematic perspective view of an arrangement according to FIG. 1 with a curved surface
  • FIG. 3 shows a representation corresponding to FIG. 1 with other beam profiles
  • Fig. 4 is a schematic representation of a
  • FIG. 5 is a perspective view of an arrangement corresponding to FIG. 4,
  • FIG. 6 is a perspective view of the arrangement according to the invention with vertical surfaces to be observed
  • FIG. 7 shows a schematic illustration of a further exemplary embodiment of the present invention
  • 8 shows a schematic illustration of another exemplary embodiment of the invention
  • Fig. 10 is a schematic representation of another embodiment of the invention.
  • a matt surface 1 which can be, for example, a surface of a bodyshell, is irradiated by a light-dark edge 6 at angles of approximately 60 °, better 75 ° or less to the normal of surface 1.
  • the contrast ratios can also be inverted, so that light areas now appear dark and dark areas now appear light.
  • the light-dark edge 6 is supplied by an illumination device 2 which has a luminance structure with a light stripe 5, the other surfaces 4 being dark. 1 and 2, the surface 1 is viewed by an observer 3, who can also be replaced by an image-recording system with corresponding image processing, at the mirror angle corresponding to the light-dark edge 6.
  • the one surrounding an error Surface appears dark to the observer because the mirror angle leads to dark surface 4. Because of the surface curvature at the error F, part of the error appears bright because the respective mirror angle leads to the bright surface 5.
  • the light-dark edge 6 is realized by a light strip-shaped surface 5 between dark surfaces, two light-dark edges arise at the transition from light to dark.
  • the width of the light stripe 5 is to be determined experimentally and is chosen so that the desired detection of the smallest occurring errors is possible.
  • a corresponding representation is shown in FIG. 3, in which an error F appears dark in two places in comparison to FIG. 1, because the error leads to darker areas 4 as well as fewer and more deflected rays.
  • the light-dark edge 6 is arranged quasi-parallel to the surface 1 and when the one to be inspected
  • the surface is a curved surface, such as the roof or the bonnet or trunk lid of a bodyshell
  • the light-dark edge 6 follows the course of the curvature of the surface 1, as a result of which an observer who views the surface transversely to the curvature in all locations 3.1, 3.2, 3.3 according to FIG. 2 finds the same lighting conditions.
  • the light-dark edge 6 formed by the light stripe 5 in dark surroundings 4 can be displaced, in FIGS. 1 to 3 in terms of height.
  • FIGS. 1 to 3 in terms of height.
  • the lighting device 2 has an arrangement of several alternating light 5 and dark 4 stripes, whereby the light stripes do not appear at the same time, but are presented one after the other.
  • FIG. 4 shows that for an observer location 3 different areas of the surface correspond with two light and dark stripes 4, 5 arranged one above the other. For example, the lower light stripe 5 is first switched on and the remaining area is dark, as a result of which the observer
  • the observer 3 can inspect part of the area 1. Subsequently, the lower light stripe 5 is switched off and the upper light stripe 5 is switched on, so that the observer 3 can view another area of the surface 1.
  • the light-dark boundary 6 or a light stripe 5 can also be shifted locally other than stepwise or step-wise, for example a light one can be shown in FIG. 4
  • Stripes are moved continuously from top to bottom or bottom to top. Such a temporal and spatial change in the structure presented causes errors to flash across the entire field of view and become inconspicuous again, thereby creating a dynamic of error detection which on the one hand supports error detection and on the other hand avoids camouflage zones in which errors are not recognized.
  • the lighting device 2 can be designed in different ways in order to provide the desired light-dark boundary in its luminance structure.
  • a luminous surface provided in the angular range of greater than 60 ° to the normal to surface 1 can be provided can be shielded according to the desired light-dark edge by mechanically movable screens.
  • Liquid crystal devices can also be provided, the permeability of which is electronically controlled in accordance with the desired luminous area.
  • FIG. 5 again shows an illumination device with a bright stripe 5 in different local assignment to an arched surface 1, the observer 3 inspecting different surface areas of the surface 1 in accordance with the beam paths shown.
  • the stripes 5 directly lined up are switched to light one after the other in time, the remaining area remaining dark.
  • the observer is preferably equipped, for example, with an infrared control device, so that he can switch on the bright stripes 5 according to his needs. If the surface is more strongly arched transversely to the observation direction, it is advantageous to use an illumination device 2 'with curved light strips 5 which can be switched on. Stripes are sufficient for only slight curvatures.
  • the luminous strips 5 are arranged parallel to the inspecting surface 1 'and can be switched on depending on the surface area to be viewed by the observer 3.
  • the glowing stripes on the lights of the fig. 5 and 6 can be Illumination of light-scattering, translucent material can be realized by tubular fluorescent lamps.
  • the fluorescent lamps can be enclosed by box-shaped or channel-shaped reflectors, leaving the light-emitting surface free.
  • a sufficient contrast is already achieved by the arrangement of the light strips if only the lamps of the strips surrounding the light strips are dimmed down to less than approx. 3%.
  • This dimming has the advantage that the lamps can be switched almost any number of times and thus a long lamp life can be achieved.
  • FIG. 7 shows an illumination device 2 with a luminance structure, which in turn has different strips 7 to be presented one after the other, the individual strips 7 consisting of alternating light and dark fields 8, 9. Because of the complicated structure of the lighting, such an arrangement can be used, in particular, for automatic image acquisition, and the light fields can also be moved continuously.
  • 8 shows an arrangement of a lighting device 2, which is designed as a roller, the Roller is rotatable, as indicated by the arrow, and has an illuminating strip 5, which can repeat along the circumference of the roller. When the roller rotates, the luminous strip, which is aligned parallel to surface 1, changes its position locally and the observer can continuously view the entire surface.
  • FIG. 9 shows an observation geometry for a cylinder 10 or, analogously, a light strip, the light density structure of which is observed by an observer with the aid of reflector optics 11.
  • the observer location can be changed with the aid of a deflection of the observer beam path by a deflecting auxiliary mirror 12. This is shown in FIG. 10, wherein an observer 3 observes the light-dark edge 6 reflected in the surface 1 or the light and dark areas 4, 5 via a deflecting mirror 12.
  • the light-dark edge 6 or the light stripe was moved in time and place relative to the fixed surface.
  • the light-dark edge 6 or the light stripe was moved in time and place relative to the fixed surface.
  • Relative movement between the surface and the light-dark edge is achieved by tilting or also pivoting, that is to say by a back and forth movement of the surface 1.
  • the luminance structure in the transverse direction to the observation direction should be at least as long as the length of the surface to be viewed.
  • a relative movement between the surface and the at least one light-dark edge by shifting the light-dark edge in combination with a transverse shift of the surface ie a movement in the direction of observation, makes sense.
  • the observed field moves over the body. If the light-dark edge 6 is additionally movable, an error can be tracked for a certain time and an adaptation can be made to the curvature of the body.
  • matt surfaces are understood to mean those surfaces which have a low proportion of gloss, such as matt metallic surfaces with a fine structure or the like.

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

L'invention concerne un dispositif servant au contrôle de surfaces mates planes et/ou courbes, contrôle devant permettre de reconnaître des défauts qui sont liés à une modification du tracé de la surface, en particulier pour le contrôle de carrosseries brutes non peintes et mates. A cet effet, on utilise un dispositif d'éclairage qui éclaire, par bandes, la surface à examiner, et la surface ainsi éclairée est examinée sous un angle définissant une réflexion. Au moins une arête de séparation clair-obscur (6), qui est plus grande seulement dans une plage angulaire qu'un angle limite par rapport à la normale à la surface à inspecter, est disposée quasiment parallèlement à la surface et transversalement par rapport au sens d'observation principal. La plage angulaire définie entre l'angle limite et ladite normale reste obscure et l'arête de séparation clair-obscur est, dans la plage angulaire, plus grande que l'angle limite et peut être décalée par rapport à la surface (1), ledit angle limite étant d'au moins 60 °.
EP97913102A 1996-10-08 1997-10-07 Dispositif pour le controle de surfaces mates planes et/ou courbes Withdrawn EP0931255A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE1996141349 DE19641349A1 (de) 1996-10-08 1996-10-08 Beleuchtungsanordnung zur visuellen und automatisierten Inspektion von Oberflächenfehlern
DE19641349 1996-10-08
PCT/DE1997/002364 WO1998015815A1 (fr) 1996-10-08 1997-10-07 Dispositif pour le controle de surfaces mates planes et/ou courbes

Publications (1)

Publication Number Publication Date
EP0931255A1 true EP0931255A1 (fr) 1999-07-28

Family

ID=7808094

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97913102A Withdrawn EP0931255A1 (fr) 1996-10-08 1997-10-07 Dispositif pour le controle de surfaces mates planes et/ou courbes

Country Status (3)

Country Link
EP (1) EP0931255A1 (fr)
DE (1) DE19641349A1 (fr)
WO (1) WO1998015815A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10132309B4 (de) * 2001-07-06 2006-09-21 Geometrie Concern Verwaltungs- Und Beteiligungsgesellschaft Mbh Visuelles Kontrollverfahren und Kontrollsystem
JP4846714B2 (ja) 2004-06-16 2011-12-28 ダウ グローバル テクノロジーズ エルエルシー チーグラー・ナッタ共触媒の同定方法
WO2006007093A1 (fr) 2004-06-16 2006-01-19 Dow Global Technologies Inc. Appareil et procede de recherche ziegler-natta
JP5188178B2 (ja) 2004-06-16 2013-04-24 ダウ グローバル テクノロジーズ エルエルシー 重合調整剤を選択するための技術

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4629319A (en) * 1984-02-14 1986-12-16 Diffracto Ltd. Panel surface flaw inspection
GB8718073D0 (en) * 1987-07-30 1987-09-03 King J T Surface inspection lighting scheme
DE3813239A1 (de) * 1988-04-20 1989-11-02 Daimler Benz Ag Pruefraum zur ueberpruefung der oberflaeche von fahrzeugkarosserien auf fehler
DE4342830C1 (de) * 1993-12-15 1995-04-20 Haeusler Gerd Vorrichtung zur Erzeugung streifenartiger Lichtmuster
US5615003A (en) * 1994-11-29 1997-03-25 Hermary; Alexander T. Electromagnetic profile scanner

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9815815A1 *

Also Published As

Publication number Publication date
WO1998015815A1 (fr) 1998-04-16
DE19641349A1 (de) 1998-04-09

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