EP3004852A1 - Procédé et dispositif d'inspection de défauts optiques - Google Patents

Procédé et dispositif d'inspection de défauts optiques

Info

Publication number
EP3004852A1
EP3004852A1 EP14735479.9A EP14735479A EP3004852A1 EP 3004852 A1 EP3004852 A1 EP 3004852A1 EP 14735479 A EP14735479 A EP 14735479A EP 3004852 A1 EP3004852 A1 EP 3004852A1
Authority
EP
European Patent Office
Prior art keywords
projection surface
optical
footprint
optical detection
generated
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Withdrawn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
EP14735479.9A
Other languages
German (de)
English (en)
Inventor
Andreas Sandner
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.)
Viprotron GmbH
Original Assignee
Viprotron 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 Viprotron GmbH filed Critical Viprotron GmbH
Publication of EP3004852A1 publication Critical patent/EP3004852A1/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Withdrawn legal-status Critical Current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
    • G01N21/95—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
    • 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
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G01B11/2433—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring outlines by shadow casting
    • 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
    • G01N21/8806—Specially adapted optical and illumination features
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/06—Illumination; Optics
    • G01N2201/061—Sources

Definitions

  • the invention relates to a method for optical
  • Illuminating surface is illuminated at least partially, and wherein a change in the parallel light rays of the illumination surface is detected by the object.
  • Such methods are for example of a
  • Test method relates to the control of framed panes and in particular multi-glazed framed panes
  • Test method to check the correct positioning of the glass panes relative to the frame elements can be determined whether a
  • Frame member was fixed at the intended position relative to the glass sheet, or whether an undesirable
  • Offset of the frame element is present, which goes beyond the usual tolerance limits of a few millimeters and the window element can be unusable.
  • Three-dimensional objects recorded comparatively sharp and dimensions are precisely determined.
  • the size of the objects is however on the diameter of the
  • the dimensions of the glass panes or the window elements are often more than 0.5 m or 1 m and can
  • a glass pane is transilluminated by a collimated light curtain, which is generated by a light source.
  • the parallel light rays, which were influenced by the glass pane, are on one of the
  • Lens system focused again on an imaging surface and captured by a camera.
  • Light curtain is significantly limited by the size and quality of the lens system with which the light curtain of parallel light after the object passage can be focused again on the imaging surface on or in the camera.
  • the design effort is very high.
  • EP 1 866 625 A2 a generic method is known in which the parallel light beams are detected and evaluated by a strip-shaped scanner device after passing through a transparent flat object with a side of the object lying opposite one of the light source.
  • Scanner devices are commercially available and are used, for example, in facsimile transmission equipment or in digital copier systems.
  • a lens system for focusing the transmitted through the object parallel light beams is not required.
  • strip-like scanner devices are combined and evaluated, for which, inter alia, an exact positioning of the multiple scanner devices relative to each other and to the object is required.
  • This object is achieved in that the light rays coming from the footprint are projected onto a projected behind the object projection surface and of the footprint on the
  • Projection surface generated shadow of the object is detected with an optical detection device.
  • the shadow thus contains a complete
  • the shadow cast can be generated by light with wavelengths within the visible light spectrum. However, it is also conceivable and advantageous in some application situations to generate the shadow cast by light with wavelengths outside the visible wavelength range and, for example, to use a light source which predominantly or exclusively infrared light or
  • the projection surface used to image the shadow and the optical detector must be similar to those used for the
  • Shadow intended wavelength range adapted or suitable for it is adapted or suitable for it.
  • the shadow cast of the object on the projection surface enables cost-effective and reliable detection and verification of the dimensions of a large-area three-dimensional object.
  • translucent areas of the object can be distinguished from opaque areas. Defects within one
  • Frame elements of a window element result in a correspondingly shifted or excessively wide
  • the projection surface can also be used for large-scale objects such as
  • glass panes or window elements with
  • the orientation of the object relative to the optical detection means are checked, so that it is not necessary, for example by means of
  • the footprint is generated with multiple light sources, which are spaced from each other.
  • the plurality of light sources may be arranged in a row or in a matrix. It is also possible to arrange different types of light sources next to one another and to combine them as required.
  • a strip-shaped light curtain is generated as a footprint and the object and the strip-shaped light curtain relative
  • the light emitted by the one or more light sources may be in the
  • the measuring system can optimally arranged and adjusted to allow the most accurate optical measurements possible.
  • a strip-shaped light curtain can according to a
  • Fresnel lens optionally multi-part Fresnel lens are generated.
  • a Fresnel lens allows comparatively large dimensions with a relatively small thickness of the Fresnel lens. In comparison with lenses made of glass or
  • Plastic Fresnel lenses allow a large area
  • Fresnel lens only a small thickness and concomitantly has a low weight.
  • Fresnel lens can also be made of several side by side
  • Fresnel lens segments be composed.
  • Luminous surface and the projection surface is moved past.
  • the light source, the Fresnel lens, the projection surface and an optical detection device can be arranged stationary and aligned and adjusted relative to each other, and then to move a large number of objects within a short time through the set-up equipment and thus be able to check. The accuracy of the measurements can be improved.
  • the verification process may be performed during the manufacture of the large-area three-dimensional objects or immediately thereafter at one time and in one place
  • An inexpensive detection of the shadow cast can be carried out with an optical lens system.
  • large-area projection surfaces can be detected very quickly and reliably and fed to an evaluation.
  • an optical lens system for example, a
  • a simple verification process that is meaningful and sufficient for many applications at the same time means that dimensions of the object are determined parallel to the projection surface. The determined
  • the size of the shadow on the projection surface can be determined quickly and reliably with almost any optical detection device. In many cases, based on the dimensions of the object, a first decision can already be made as to whether the object has successfully passed the check or whether an error has been detected, or if applicable, the object of a closer and possibly manual one
  • Glass panes also make it possible to perform an automated error check. For this purpose, it is provided that irregularities are determined within the object. Unless the irregularities, For example, imperfections, inclusions, bubbles, scratches or streaks a noticeable change in the
  • these irregularities can be determined and displayed, or fed to a further evaluation. It is also possible to distinguish the detected irregularities according to pre-defined criteria and, depending on the criterion, to do the same
  • the invention also relates to a device for optically checking a large-area three-dimensional object.
  • the devices known from practice have a luminous source, a device for generating a
  • Luminous surface of parallel light beams and an optical detection means for detecting a change in the parallel light rays of the luminous surface by the object.
  • a projection surface is arranged at a distance from the illumination surface, and that the optical detection device is suitable for detecting the shadow cast of the object produced by the illumination surface on the projection surface from an object located in the beam path of the parallel light rays.
  • Shadow of the object to be made visible Many commercially available optical detectors are capable of detecting the shadow cast on a projection screen. It is therefore not
  • the shadow cast of the object on the projection surface can be detected, for example, with a video camera with a digital storage medium.
  • a video camera with a digital storage medium for example, a CCD sensor or a CMOS sensor
  • an optical detection device may also include a plurality of cameras or a plurality of CCD sensors, or CMOS sensors.
  • a large-area projection surface with a linear extension of more than one meter can be detected with a sufficient resolution and with a sufficient contrast to compensate for the
  • the optical detection device may be provided and advantageous, in particular, for the detection of large projection surfaces, if the optical detection device consists of several components or imaging imaging devices whose information can subsequently be combined and processed as automated as possible.
  • Detecting device such as a CCD camera or a CMOS camera, further processing and evaluation of the measured raw data becomes particularly easy.
  • a large-area luminous surface made of parallel light beams can be achieved by using a Fresnel lens, which may have a multi-part design.
  • a long and approximately linear luminous area can be achieved with a comparatively low weight and with a small total thickness of the Fresnel lens.
  • Focusing device to use.
  • a luminous area of parallel light beams could also be generated by a system of several juxtaposed lenses.
  • a luminous area of parallel light beams could also be generated by a system of several juxtaposed lenses.
  • Light source can also be used mirror systems to produce a footprint with parallel light rays.
  • Projection surface an opaque slice of one
  • the shadow of the object can thereby be detected on a side facing away from the object side of the projection surface, so that the s.der
  • the light source, the means for generating a luminous surface of parallel light beams, the Projection surface and the optical detection device can be arranged along an optical axis, resulting in particularly advantageous geometric conditions for a large-scale scanning and verification of a
  • a suitable projection surface may be, for example, a surface-treated glass pane, both
  • the projection surface has an opaque film or an opaque sheet.
  • Suitable films are commercially available, for example, as filter films.
  • An opaque film may be on a low cost transparent substrate such as
  • polymethylmethacrylate For example, be applied polymethylmethacrylate or stretched in a frame.
  • FIG. 1 shows a schematic representation of the method according to the invention for the optical inspection of a large-area three-dimensional object
  • Figure 2 is an exemplary representation of one for the
  • Figure 3 is a schematic representation of a differently designed device, which is used to carry out the
  • Figure 4 is a schematic representation of a turn deviating designed device.
  • Three-dimensional object is generated with a light source 1, a light beam 2 of non-coherent light.
  • a suitable optical component 3 With a suitable optical component 3, a footprint 4 of parallel light beams is generated, which on a
  • Projection surface 5 are directed.
  • the projection surface 5 consists of a translucent pane with a matt surface 6.
  • an optical detection device 7 is arranged, with an image of the projection surface 5 can be recorded.
  • the projection surface 5 is illuminated by the illumination surface 4 with parallel light beams.
  • An object 8 located between the illumination surface 4 and the projection surface 5 generates a projection on the projection surface 5
  • the shadow can be with the optical
  • Detection device 7 detected and evaluated.
  • the shadow cast by the object 8 on the projection surface 5 changes in a corresponding manner.
  • the shadow cast with the optical detection device 7 can also large-scale objects 8, the dimensions of which are larger than the dimensions of the illumination surface 4 and the projection surface 5, are checked with the arrangement described above.
  • the optical detection device 7 Based on the size and shape of the shadow cast, which is imaged and detected by the optical detection device 7, it can be checked by comparison with predetermined reference values whether the dimensions of the object 8 are within predetermined tolerance ranges or if the object 8 has deviations from the predetermined reference values that may cause the object 8 to fail the check or, if appropriate, another more in-depth and
  • Embodiment the light generated by the light source 1 from a Fresnel lens 9 in a
  • strip-shaped footprint 4 are given by a strip-shaped aperture 10.
  • a window element 11 moved between the luminous surface 4 and the projection surface 5 with a glass pane 12 and a frame 13 surrounding the glass pane 12 generates a shadow 14 on the projection surface 5.
  • the dimensions of the shadow cast 14 correspond to FIG.
  • the frame 13 of the window member 11 is moved between the luminous surface 4 and the projection 5 through.
  • the shadow cast 14 generated on the projection surface 5 is detected.
  • the raw data recorded by the CCD camera 15 are fed to an evaluation device 16, with the aid of which the dimensions of the shadow cast 14 are determined and determined
  • predetermined reference values are retrieved from a memory device 17.
  • a memory device 17 In the exemplary embodiment in FIG. 3 and schematically
  • incident parallel light beams are arranged in the direction of the spaced apart from the mirror 18
  • Projection surface 5 reflected. Between the mirror 18 and the projection surface 5, the object 8 can be displaced parallel to the projection surface 5. The one of the
  • Object 8 generated on the projection surface 5 shadow is detected with the optical detection device 7.
  • Embodiment of a device designed again deviating from the light source 1 is generated
  • Light beam 2 is parallelized by the lens 3 and thrown onto a semi-transparent mirror 19. A part of the light beam 2 is in the direction of the mirror 18th
  • Projection surface 5 generated shadow can be detected by means of the optical detection device 7.
  • the exemplary embodiments of the device according to the invention described in FIGS. 3 and 4 are particularly suitable in confined spaces.
  • the beam path of the parallel light beam 2 described in FIG. 4 has a double passage through the object 8, so that a shadowing caused, for example, by disturbances in glass surfaces is enhanced and imaged with a higher contrast in the shadow cast on the projection surface 5.

Landscapes

  • Physics & Mathematics (AREA)
  • General 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)
  • Immunology (AREA)
  • Pathology (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

L'invention concerne un procédé de contrôle optique d'un objet tridimensionnel de grande surface (8), dans lequel avec une source lumineuse (1) est générée une surface d'éclairage (4) de rayons lumineux parallèles, un objet tridimensionnel de grande surface (8) est éclairé en partie ou en totalité par la surface d'éclairage (4) et une modification des rayons lumineux parallèles de la surface d'éclairage (4) est captée par l'objet (8). Une surface de projection (5) est disposée sur un côté de l'objet (8) opposé à la source lumineuse (1), et l'ombre portée de l'objet (8) générée par la surface d'éclairage (4) sur la surface de projection (5) est captée avec un dispositif de détection optique (7). Le rideau de lumière en forme de bande est généré avec une lentille de Fresnel. L'ombre portée est captée avec un système de lentilles optique ou avec une caméra CCD. Les dimensions de l'objet (8) sont déterminées parallèlement à la surface de projection (5) et sont comparées à des données de référence prédéterminées. La surface de projection (5) est un disque opaque d'un matériau translucide ou une vitre traitée en surface.
EP14735479.9A 2013-06-03 2014-06-03 Procédé et dispositif d'inspection de défauts optiques Withdrawn EP3004852A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201310105693 DE102013105693A1 (de) 2013-06-03 2013-06-03 Verfahren und Vorrichtung zur optischen Fehlerinspektion
PCT/EP2014/061456 WO2014195296A1 (fr) 2013-06-03 2014-06-03 Procédé et dispositif d'inspection de défauts optiques

Publications (1)

Publication Number Publication Date
EP3004852A1 true EP3004852A1 (fr) 2016-04-13

Family

ID=49323384

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14735479.9A Withdrawn EP3004852A1 (fr) 2013-06-03 2014-06-03 Procédé et dispositif d'inspection de défauts optiques

Country Status (4)

Country Link
US (1) US9766188B2 (fr)
EP (1) EP3004852A1 (fr)
DE (1) DE102013105693A1 (fr)
WO (1) WO2014195296A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10650646B2 (en) * 2017-12-06 2020-05-12 Illinois Tool Works Inc. Method of increasing detection zone of a shadow-based video intrusion detection system

Family Cites Families (9)

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Publication number Priority date Publication date Assignee Title
GB2065299B (en) 1979-12-13 1983-11-30 Philips Electronic Associated Object measuring arrangement
IL63264A (en) * 1980-11-04 1986-07-31 Israel Atomic Energy Comm Topographical mapping system and method
DE3937559A1 (de) * 1989-09-02 1991-03-14 Flachglas Ag Verfahren zum ermitteln von optischen fehlern in scheiben aus einem transparenten material, insbesondere aus glas
DE10111450B4 (de) 2001-03-09 2005-02-10 Schott Ag Verfahren und Vorrichtung zur Bewertung von Schlieren
DE10203595A1 (de) 2002-01-30 2003-08-21 Intego Gmbh Erkennung von Fehlstellen in transparenten Stücken
GB0307345D0 (en) 2003-03-29 2003-05-07 Pilkington Plc Glazing inspection
CN101175986B (zh) 2005-04-06 2010-10-13 康宁股份有限公司 玻璃检测系统及其使用方法
US8242477B2 (en) 2007-01-12 2012-08-14 Synergx Technologies Inc. Bright field and dark field channels, used for automotive glass inspection systems
FR2939190B1 (fr) 2008-12-02 2014-11-14 Essilor Int Dispositif et procede pour mesurer une caracteristique geometrique relative a la cambrure d'une lentille ophtalmique

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2014195296A1 *

Also Published As

Publication number Publication date
US9766188B2 (en) 2017-09-19
US20160103081A1 (en) 2016-04-14
WO2014195296A1 (fr) 2014-12-11
DE102013105693A1 (de) 2013-10-31

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