[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

WO2007137835A2 - Procédé et ensemble permettant de déterminer la qualité optique d'une vitre transparente - Google Patents

Procédé et ensemble permettant de déterminer la qualité optique d'une vitre transparente Download PDF

Info

Publication number
WO2007137835A2
WO2007137835A2 PCT/EP2007/004783 EP2007004783W WO2007137835A2 WO 2007137835 A2 WO2007137835 A2 WO 2007137835A2 EP 2007004783 W EP2007004783 W EP 2007004783W WO 2007137835 A2 WO2007137835 A2 WO 2007137835A2
Authority
WO
WIPO (PCT)
Prior art keywords
grid
image data
raster
data processing
image
Prior art date
Application number
PCT/EP2007/004783
Other languages
German (de)
English (en)
Other versions
WO2007137835A3 (fr
Inventor
Hans-Peter Andrae
Georg Bauer
Original Assignee
Gm Global Technology Operations, Inc.
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 Gm Global Technology Operations, Inc. filed Critical Gm Global Technology Operations, Inc.
Publication of WO2007137835A2 publication Critical patent/WO2007137835A2/fr
Publication of WO2007137835A3 publication Critical patent/WO2007137835A3/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • 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
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N21/958—Inspecting transparent materials or objects, e.g. windscreens
    • 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
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N21/958—Inspecting transparent materials or objects, e.g. windscreens
    • G01N2021/9586—Windscreens

Definitions

  • the present invention relates to a method and an arrangement for determining the optical quality of a transparent pane and more particularly relates to a method and an arrangement for detecting deflection angles and / or refractive values of a transparent pane by means of a raster projection method in which a raster passes through the pane to be tested - is shown by.
  • panes for vehicle glazing especially windshield and rear windows, is of great importance since articles must be observed through the panes.
  • the optical quality of a transparent pane is essentially determined by the wedge angle (angle between the parallel pane surfaces) of the pane and its refractive index. More specifically, the wedge angle causes a deflection of the passing light rays and thus an apparent displacement of the observed objects, while the refractive index causes the observed objects to appear distorted. This will be explained in more detail with reference to FIG. In Fig. 3, light rays passing through a transparent panel are schematically shown. The light rays are incident on the disk at an angle of incidence ⁇ to the normal direction. When the light rays exit the disc, each light beam is displaced in a direction y perpendicular to the direction of incidence and optionally exits in a direction of failure different from the direction of incidence. The difference angle between incidence and exit directions is defined as the deflection angle ⁇ ⁇ . This depends on the wedge angle of the disc, the disc curvature and the angle of incidence ⁇ of the light rays.
  • FIG. 3 an inhomogeneous disk is shown schematically, wherein for purposes of illustration two incident on a bubble-shaped thickening of the disk light rays are shown.
  • the two light beams have an offset in the direction perpendicular to the direction of incidence y when hitting the disc. Due to the bubble-shaped thickening of the disk and the consequent optical inhomogeneity of the disk, the two light beams exit the disk with different deflection angles ⁇ ⁇ , which leads to a non-zero deflection angle difference ⁇ ⁇ between the two light beams.
  • a measure of this is the refractive power D ⁇ measured in diopters (1 m -1 ), which shows the change in the deflection angle ⁇ ⁇ of two when hitting the disk in FIG indicates a direction perpendicular to the direction of arrival perpendicular direction y offset light rays.
  • Such optical inhomogeneities reduce the optical quality of the disk and make it even unusable for certain applications.
  • German DIN standard no. 52305 describes various methods for determining the deflection angles and refractive indices of safety windows for vehicle glazing by means of raster projection methods.
  • raster projection method follows from the measurement method of this type, in which a particular raster, which is usually in the form of a line or stripe pattern, is projected through the disk to be tested onto a screen.
  • a projection device for the grid a projector with integrated raster imaging optics or a point light source can be used, wherein in the latter case only a shadow image of the grid is imaged.
  • a so-called oblique line method is used, in which a "slant line", that is to say an arrangement of with respect to the horizontal oblique, mutually parallel lines, is projected through the disc on a screen called projection screen.
  • the change in the width of the projected lines serves as a measure of the deflection angle ⁇ ⁇ of the disk to be tested.
  • the projection device For simple determination of the deflection angle, a family of mutually parallel grid lines is projected through the disk 101 onto a screen.
  • the projection device should be set up so that a projected raster line remains unchanged in width with an optically flawless pane of the same pane thickness.
  • Zerobraraster that is, an array of light and dark stripes projected through the glass on the screen.
  • the largest and smallest values of the widths of the projected strips serve as a measure of the refractive index of the disk to be tested.
  • the invention is to provide a method for detecting the optical quality of a transparent pane, which avoids these disadvantages.
  • a raster projection method for detecting the optical quality of a transparent pane for example windscreens or rear windows of a motor vehicle
  • a raster is projected through the transparent pane by means of a projection device, whereby a raster image (image of the raster) is produced
  • the raster projection method according to the invention is essentially characterized in that image data of the raster image is acquired pixel by pixel at least in one slice section by means of an electronic image data acquisition device suitable for capturing image data and then by means of an electronic data processing device connected to the image data acquisition device and suitable for data processing based on the acquired image data Deflection angle and / or refractive index of the disc can be determined.
  • the method according to the invention thus makes it possible for the first time to quantitatively detect the optical quality of a complete pane or at least one slice section on the basis of deflection angles and / or refractive values.
  • ⁇ according to the grid is projected onto a (for example, flat) screen and pixel by pixel, detects the image data of the raster image by means of a digital (still) camera, which are then fed to the electronic data processing device for further evaluation.
  • the image data obtained in this way in digital form can then be analyzed, for example, by determining the position of raster lines and / or the strip width of raster strips by means of a pixel-by-pixel gray or color value detection and evaluating them by comparison with a selectable comparison pattern for the quantitative determination of deflection angles and refractive values become.
  • the image data of the raster image can be analyzed without prior imaging on a projection surface by means of a charge coupled device (CCD) camera, wherein the location of raster lines or the strip width of raster strips by means of a detection of electrical charge determined pixel by pixel and can be evaluated by comparison with a selectable comparison pattern for the quantitative determination of deflection angles and refractive indices.
  • CCD charge coupled device
  • deflection angle of the transparent pane can be determined in an advantageous manner.
  • an arrangement of light and dark stripes having a selectable stripe width can be projected as a grid ("zebra screen"), whereby it is possible to determine refractive values of the transparent pane in an advantageous manner.
  • the invention further extends to a program code for an electronic data processing device suitable for data processing, which contains control commands which cause the data processing device to carry out a method as described above. Further, the invention extends to a storage medium having stored thereon such program code.
  • the invention extends to an arrangement for detecting the optical quality of a transparent pane with a projection device for projection of a grid, as well as a grid, which is arranged so that it can be projected through the pane.
  • the projection of the grid creates a raster image.
  • an electronic image data acquisition device for the pixel-by-pixel acquisition of image data of the raster image and an electronic device connected to the image data acquisition device and suitable for data processing
  • Data processing device for determining deflection angles and / or refractive powers of the disc arranged on the basis of the acquired image data.
  • the projection device comprises a punctiform light source and a grid arranged between the light source and a lens.
  • a point light source In an alternative advantageous Embodiment of the invention is arranged as a projection device, a point light source.
  • the disc to be tested is mounted on a height-adjustable support, so that the position of the disc can be changed perpendicular to the beam path. This improves the spatial resolution in the inspection of the optical quality of the disk, since different disk sections can be selectively tested.
  • Fig. 1 is a schematic representation of
  • FIG. 2 shows a schematic representation to illustrate a second exemplary embodiment of the arrangement according to the invention for carrying out the raster projection method according to the invention
  • Fig. 3 is a schematic representation for illustrating the beam path of light rays through a transparent pane.
  • the prior art Figure 3 has already been explained at the outset, so that here a further description is unnecessary.
  • FIG. 1 a first embodiment of the inventive arrangement for carrying out the raster projection method according to the invention is shown.
  • a light source 3 for example a high-pressure arc lamp, for emitting light beams, and a pinhole 7 delimiting the light beams of the light source 3 are provided as the projection device.
  • a grid 5 is arranged in the beam path of the arrangement, which is projected by the light source 3 as a shadow image on the screen 8.
  • a transparent disc 1 is arranged, in such a way that the grid 5 is projected through the disc 1 on the screen 8.
  • the disk 1 is hereby positioned in a support 9 in vehicle installation position.
  • the height of the support 9 and thus the height of the disc 1 is perpendicular to the beam path adjustable.
  • the pinhole 7 improves the depth of field in the edge regions of the strips.
  • the aperture diameter of the pinhole is 8 mm.
  • the distance of the screen from the pinhole is 8 meters and the distance of the disc from the screen is 4 meters, so that the disc is located approximately in the middle between the pinhole 7 and the screen 8. The caused by diffraction
  • Raster uncertainty in this case is about 2 mm.
  • the smallest object perceptible by its kernel shadow in the to be tested Disk 1 has in the selected arrangement a dimension of about 1, 5 mm.
  • an image data acquisition device in the form of a digital still camera 10 is provided in the arrangement according to the invention.
  • the still camera 10 is placed behind the screen 8 so that it can take a photograph of the grid displayed thereon.
  • the still camera 10 is connected via a data line 12 to an electronic data processing device 11 for processing the image data obtained from the still camera 10.
  • the grid may be, for example, a slant line as described above for determining deflection angles of the pane 1 or a zebra grid as described above for determining the refractive powers of the pane 1.
  • the slanted line grid or zebra grid is projected onto the display wall 8 with the aid of the light source 3.
  • the image data of the grid 5 imaged on the screen 8 are photographically recorded, which are thereby available in digital form.
  • the image data are then supplied to the data processing device 11 by means of the data line 12, in which they are evaluated.
  • the image data are analyzed, for example, by determining pixel by pixel the position of raster lines and / or the strip width of raster strips by means of a gray or color value detection and evaluated by comparison with a selectable comparison pattern for the quantitative determination of deflection angles and refractive values.
  • deflection angles and / or refractive powers of the pane 1 can be represented, for example, in a flat false-color representation.
  • FIG. 2 a second embodiment of the inventive arrangement for carrying out the method according to the invention is illustrated in a schematic manner, with only the differences from the arrangement of Fig. 1 are explained and otherwise, to avoid unnecessary repetition, reference is made to the comments on Fig. 1 becomes.
  • a projector 2 is used as a projection device.
  • the projector 2 comprises a punctiform light source 3, a condenser 4, a grid 5, and an objective 6, which is arranged in this order in the optical beam path.
  • the objective 6 the light source 3 is imaged at the location of a pinhole 7 integrated in the projector.
  • the grid 5 is projected from the projector 2 through a glass pane 1 to be tested on a screen 8, to thereby draw conclusions about the optical quality of the disc 1.
  • the sharpness of the central projection is determined by the aperture diameter of the aperture 7, where: je is smaller than the opening diameter of the pinhole 7, the smaller areas of the disk to be tested 1 can still be clearly recognized.
  • je is smaller than the opening diameter of the pinhole 7, the smaller areas of the disk to be tested 1 can still be clearly recognized.
  • the aperture diameter of the pinhole is 8 mm
  • the distance of the screen 8 from the pinhole 7 is 8 meters
  • the distance of the disc 1 from the screen 8 is 4 meters, so that the disc approximately in the middle between the pinhole 7 of the projector 2 and the screen wall 8 is arranged.
  • the diffraction caused by diffraction is in this case about 1 mm.
  • the smallest object perceptible by its core shadow in the disk to be tested has a dimension of about 3 mm.
  • the requirement for good sensitivity with the largest possible measuring range results in a favorable construction if the pane 1 to be tested is arranged approximately in the middle between the perforated panel 7 and the screen 8.

Landscapes

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

Abstract

La présente invention concerne un procédé de projection de trame et un ensemble permettant de déterminer la qualité optique d'une vitre transparente (1). Selon ledit procédé, une trame (5) est projetée à travers la vitre (1) au moyen d'un dispositif de projection (2; 3), de sorte qu'une image de trame est produite. Selon ladite invention, des données image de l'image de trame sont acquises pixel par pixel, au moins dans une section de la vitre, au moyen d'un dispositif électronique d'acquisition de données image (10), approprié pour acquérir des données image, et des angles de déflexion et/ou des indices de distorsion de la vitre (1) sont déterminés à partir des données image acquises au moyen d'un dispositif électronique de traitement de données, approprié au traitement de données et relié au dispositif d'acquisition de données image.
PCT/EP2007/004783 2006-05-31 2007-05-30 Procédé et ensemble permettant de déterminer la qualité optique d'une vitre transparente WO2007137835A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006025312.4 2006-05-31
DE200610025312 DE102006025312A1 (de) 2006-05-31 2006-05-31 Verfahren und Anordnung zur Erfassung der optischen Qualität einer transparenten Scheibe

Publications (2)

Publication Number Publication Date
WO2007137835A2 true WO2007137835A2 (fr) 2007-12-06
WO2007137835A3 WO2007137835A3 (fr) 2008-02-07

Family

ID=38650352

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/004783 WO2007137835A2 (fr) 2006-05-31 2007-05-30 Procédé et ensemble permettant de déterminer la qualité optique d'une vitre transparente

Country Status (2)

Country Link
DE (1) DE102006025312A1 (fr)
WO (1) WO2007137835A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104554341A (zh) * 2014-12-06 2015-04-29 呼和浩特铁路局科研所 检测轨道平顺度的系统和方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017123243B4 (de) * 2017-10-06 2022-09-29 Webasto SE Verfahren zur Ausbildung eines Glaselements mit einem Trägerelement

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4299482A (en) * 1979-11-01 1981-11-10 The United States Of America As Represented By The Secretary Of The Air Force Measurement of windscreen distortion using optical diffraction
FR2556097A1 (fr) * 1983-12-01 1985-06-07 Nippon Sheet Glass Co Ltd Appareil de recherche de distorsions dans une plaque de verre
EP0484237A1 (fr) * 1990-10-31 1992-05-06 Saint-Gobain Vitrage International Procédé et dispositif de mesure de la qualité optique d'un vitrage
EP0491555A1 (fr) * 1990-12-19 1992-06-24 Toyo Glass Company Limited Procédé et appareil pour l'inspection d'objets transparents
US5812260A (en) * 1995-10-16 1998-09-22 Corning Incorporated Method and system for measuring optical distortion
EP1065498A2 (fr) * 1999-06-14 2001-01-03 Ford Motor Company Procédé et appareil pour la détermination de la qualité

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4299482A (en) * 1979-11-01 1981-11-10 The United States Of America As Represented By The Secretary Of The Air Force Measurement of windscreen distortion using optical diffraction
FR2556097A1 (fr) * 1983-12-01 1985-06-07 Nippon Sheet Glass Co Ltd Appareil de recherche de distorsions dans une plaque de verre
EP0484237A1 (fr) * 1990-10-31 1992-05-06 Saint-Gobain Vitrage International Procédé et dispositif de mesure de la qualité optique d'un vitrage
EP0491555A1 (fr) * 1990-12-19 1992-06-24 Toyo Glass Company Limited Procédé et appareil pour l'inspection d'objets transparents
US5812260A (en) * 1995-10-16 1998-09-22 Corning Incorporated Method and system for measuring optical distortion
EP1065498A2 (fr) * 1999-06-14 2001-01-03 Ford Motor Company Procédé et appareil pour la détermination de la qualité

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104554341A (zh) * 2014-12-06 2015-04-29 呼和浩特铁路局科研所 检测轨道平顺度的系统和方法

Also Published As

Publication number Publication date
DE102006025312A1 (de) 2007-12-06
WO2007137835A3 (fr) 2008-02-07

Similar Documents

Publication Publication Date Title
DE3816392C2 (fr)
DE19643018B4 (de) Verfahren und Vorrichtung zum Messen des Verlaufs reflektierender Oberflächen
WO2010076066A1 (fr) Système de caméra pour l'acquisition de l'état d'une vitre d'un véhicule
DE102006015792A1 (de) Verfahren und System zur Formmessung einer reflektierenden Oberfläche
EP3004851B1 (fr) Procédé de détermination de la puissance de réfraction d'un objet transparent et dispositif correspondant
DE69107128T2 (de) Verfahren und Vorrichtung zur Messung der Qualität einer Glasscheibe.
WO1998017993A2 (fr) Procede de detection d'erreurs optiques dans des plaques a grande surface
DE69104010T2 (de) Verfahren und Vorrichtung zur Messung der Qualität einer Glasscheibe.
DE3937559A1 (de) Verfahren zum ermitteln von optischen fehlern in scheiben aus einem transparenten material, insbesondere aus glas
EP0152894B1 (fr) Dispositif pour la détection optique d'inégalités locales dans la structure d'un objet examiné
EP3494388B1 (fr) Dispositif et procédé pour déterminer un angle de visée d'image double
EP3134726B1 (fr) Procédé et dispositif permettant de détecter des inclusions de sulfure de nickel dans une plaque de verre
DE102006051538B4 (de) Verfahren und Vorrichtung zur Bestimmung der Waviness von Glasscheiben
DE102009024961B4 (de) Verfahren und Vorrichtung zur Bewertung von Scheinwerfern
WO2007137835A2 (fr) Procédé et ensemble permettant de déterminer la qualité optique d'une vitre transparente
DE10117390A1 (de) Vorrichtung zur quantitativen Beurteilung der räumlichen Lage zweier Maschinenteile, Werkstücke oder anderer Gegenstände relativ zueinander
EP4341674A1 (fr) Procédé et dispositif de détection de défauts locaux sur une surface spéculaire
DE2310763C3 (de) Verfahren zur Prüfung der optischen Qualität transparenter Scheiben
EP1872085B1 (fr) Procede pour mesurer des structures d'un objet
DE102017212002A1 (de) Verfahren und Anordnung zur Bestimmung der Ausrichtung eines stationären Laserscanners
EP4256509A1 (fr) Procédé de mesure de l'influence d'une vitre transparente
DE102010003095A1 (de) Verfahren und Vorrichtung zur Prüfung flächenhafter, lichtempfindlicher Halbleiterbauelemente, insbesondere Solarzellen
WO2020144329A1 (fr) Procédé et dispositif de détection d'un revêtement sur une surface
WO2024189077A1 (fr) Procédé et appareil de détermination de réfringence d'un objet optiquement transparent
DE10328145A1 (de) Verfahren und Vorrichtung zur Vermessung der Abbildungseigenschaften von transparenten Objekten

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 07725673

Country of ref document: EP

Kind code of ref document: A2

122 Ep: pct application non-entry in european phase

Ref document number: 07725673

Country of ref document: EP

Kind code of ref document: A2