DE102008055595A1 - Object i.e. hole, illuminating method, involves directly conducting light quantity to explorative feature of object, and discharging light quantity from optical fiber, and illuminating feature or section of completely observed object - Google Patents

Object i.e. hole, illuminating method, involves directly conducting light quantity to explorative feature of object, and discharging light quantity from optical fiber, and illuminating feature or section of completely observed object

Info

Publication number
DE102008055595A1
DE102008055595A1 DE200810055595 DE102008055595A DE102008055595A1 DE 102008055595 A1 DE102008055595 A1 DE 102008055595A1 DE 200810055595 DE200810055595 DE 200810055595 DE 102008055595 A DE102008055595 A DE 102008055595A DE 102008055595 A1 DE102008055595 A1 DE 102008055595A1
Authority
DE
Germany
Prior art keywords
characterized
light
object
light guide
method according
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Withdrawn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
DE200810055595
Other languages
German (de)
Inventor
Ralf Christoph
Daniel Härter
Claas MÜLLER
Holger Reinecke
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.)
Werth Messtechnik GmbH
Original Assignee
Werth Messtechnik 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 Werth Messtechnik GmbH filed Critical Werth Messtechnik GmbH
Priority to DE200810055595 priority Critical patent/DE102008055595A1/en
Publication of DE102008055595A1 publication Critical patent/DE102008055595A1/en
Application status is Withdrawn legal-status Critical

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00Measuring arrangements characterised by the use of optical means
    • G01B11/02Measuring arrangements characterised by the use of optical means for measuring length, width or thickness
    • G01B11/03Measuring arrangements characterised by the use of optical means for measuring length, width or thickness by measuring coordinates of points
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00Measuring arrangements characterised by the use of optical means
    • G01B11/24Measuring arrangements characterised by the use of optical means for measuring contours or curvatures

Abstract

The invention relates to a method and an arrangement for illuminating an object to be measured with an image processing device, wherein light is guided to the object via a light guide. So that the illumination of the object does not hinder or impair the measurement of features and the necessary illumination intensities for measuring features do not lead to unwanted heating of the object itself and thus to measurement distortions, it is proposed that the amount of light necessary for the illumination be direct via the light guide directed to a feature to be examined of the object and exit from the light guide is designed so that exclusively or substantially exclusively the feature or a feature comprehensive section of the entire object being viewed is illuminated.

Description

  • The The invention relates to a method for illuminating a an image processing device, in particular a coordinate measuring machine object to be measured, with light passing through a light guide to illuminate the object.
  • Further The invention relates to an arrangement for measuring an object with in particular a coordinate measuring machine comprising a lighting arrangement for illuminating the object and an image processing device for measuring features of the object.
  • In known systems for illuminating objects for subsequent measurement or viewing with image processing devices, a distinction is made between different basic principles. These are transmitted light illumination, bright field incident illumination, dark field illumination. Lighting devices are also known in which the angle between image processing beam path and illumination device is adjustable ( WO002002082011A4 . US000006179439B1 . US000004893223A . US000005690417A . US000005897195A . EP000000385262B1 . WO002006114165A1 . EP000001363153B1 ).
  • disadvantage All of the aforementioned types of lighting is that when measuring objects For example, holes and other incisions with unfavorable Aspect ratio (deep cuts), the lighting through the object itself is sealed off and thus a measurement on the structural ground or deeper lateral structures is difficult. Should measurements be made on the bottom of such structures Also, the entire scene is often illuminated by the above lying surfaces outshined, so that a measuring at the bottom is not possible at all. Likewise become bad at high illuminance levels reflective surfaces in addition to the actually desired amount of light also significant amounts of heat radiation in the test object brought in. This can lead to falsification of measurement results to lead.
  • Of the present invention is based on the object, the disadvantages avoid the prior art, in particular to ensure that by illuminating the object, measuring features is not is impeded or impaired and that the necessary Illuminance intensities for measuring features to unwanted Heating of the object itself and thus to Messverfälschungen do not lead.
  • to Solution of the problem provides a method of the aforementioned In particular, that is necessary for the lighting Amount of light via the light guide directly to a to be examined Characteristic of the object passed and light emission from the light guide is designed so that exclusively or substantially exclusively the feature or a feature comprising the feature Section of the total object considered is illuminated. When Optical fiber may be a glass fiber, a plastic fiber or a liquid light guide be used.
  • Independently Of these, it is provided in particular and inventively that the light over the light guide in or about focal plane the image processing device is passed and in this area emerges from the light guide.
  • It If a lighting device is a "thin" optical fiber or fiber lighting designed to provide the required amount of light directly into the structure to be measured. A lighting of it surrounding areas of the test object is thus avoided.
  • This leads both to a better contrasting of the measured Structure as well as to prevent the overall performance entry and thus heat input into the test object.
  • at the use of the mentioned approach makes it possible the environment of the actual structure to be measured completely to keep in the dark. Thus, also misleading influences avoided in the imaging beam path.
  • According to the invention the light from a light source such as a halogen fiber light source or LED in a glass or plastic or similar liquid light-conducting Fiber introduced. This fiber will have a suitable mechanical guidance in front of the optics of the image processing beam path brought. The configuration is chosen so that the actual fiber in focus or outside the focus range of the lens is positioned. The light emission is located near the focal plane of the the optical image used lens. The outlet openings The light guide can go through in different directions Sanding or mirror or the like may be formed so that the light emerges directed.
  • Optional is the light-guiding light guide in several axes or an axis adjustable to design. Likewise the exit angle be made adjustable.
  • Especially is provided that the exit of the light guide is smaller than that Visual field of the image processing beam is formed.
  • Furthermore, the exit of the light from the light guide should be within the field the image processing beam path are located.
  • It are a variety of ways, such as the light emission is designed from the light guide. So can for a suggestion Light exit or light exit surface of the light guide be optically polished. Matting is also possible.
  • To Another proposal is the light exit or the light exit surface at a defined angle, in particular 45 ° to the longitudinal axis of the Beveled light guide.
  • longitudinal axis refers to the course of the light guide in the area of Light output.
  • It There is also the option as a light exit surface to provide a ball lens. As a light exit surface can also a surface with partial opaque Cover be used. After another suggestion can be used as a light exit, a light exit element, the several superposed balls or other bodies includes.
  • Of the Optical fiber can be mechanically rotated and / or swiveled be.
  • When Light source may be an LED and / or halogen lamp and / or laser diode be used.
  • Independently From this it is provided that the optical fiber lighting arrangement via a mechanical axis parallel or perpendicular to the beam direction the illumination beam path is made adjustable.
  • Of Furthermore, the light guide lighting can be configured so that only a narrowly delimited area of the measurement object illuminated is significantly smaller than the field of view of the image processing beam path used is.
  • A Arrangement for measuring an object of the type mentioned draws characterized by the fact that when measuring the light output of the light guide in or about the focal plane of the image processing device is positioned. Furthermore, light should exit from the light guide to be smaller than the field of view of the image processing beam path.
  • Especially is provided that the exit of the light from the light guide located within the field of view of the image processing beam path.
  • A Fiber lighting for image processing device records characterized by that for the lighting of the object scene necessary amount of light via a fiber directly to the examining feature is brought and the light emitted so designed that is only a section of the entire object under consideration is illuminated.
  • Further Details, advantages and features of the invention do not arise only from the claims, the features to be taken from them - for themselves and / or in combination - but also from the following Description of the drawing to be taken preferred embodiments.
  • It demonstrate:
  • 1 a schematic diagram of a coordinate measuring machine,
  • 2 a first embodiment of a lighting arrangement with light guide for illuminating a feature to be measured of an object and
  • 3a ) -E) Embodiments of optical fibers in the region of their light exits The following statements are made against the background that knowledge of the coordinate metrology is present. In addition, the references DE.Z .: The Library of Technology, Coordinate Metrology in Industrial Use, Verlag Moderne Industrie, Volume 203 (cf. ISBN 3-478-93212-2 ) and DE.Z .: The Library of Technology, Multisensor Coordinate Metrology, Verlag Moderne Industrie, Volume 248 ( ISBN 3-478-93290-4 ), which are expressly referred to and whose content belongs to the disclosure content of the description.
  • The well-known and again in the 1 reproduced principle of a coordinate measuring machine 10 includes a z. B. made of granite base frame 12 with measuring table 14 on which an object to be measured 16 is positioned to measure features of this.
  • Along the base frame 12 is a portal 18 adjustable in Y-direction. These are columns or stands 20 . 22 sliding on the base frame 12 supported. From the columns 20 . 22 go a traverse 24 along which a carriage is movable, in turn, a quill or column 26 absorbs, which is adjustable in the Z direction. From the quill 26 or, if necessary, one with the quill 26 connected change interface in the present case is an image processing camera 30 out.
  • The image processing camera becomes the object 16 or features of the object such as a hole 32 measured. So that the bore 30 can be measured, this is inventively in the range of each to be measured features by means of a light guide 34 illuminated, the light output is designed so that the reason only to mes send section of the object to be measured 16 is illuminated. Only the area that is to be measured is specifically illuminated, so that disturbing reflections from other object areas can be avoided. It is also possible to reduce the illumination intensity by selectively directing the light to the feature to be measured so that unwanted heating due to otherwise required strong light intensities is avoided.
  • Over the light guide 34 , which may be formed as a glass fiber, plastic fiber or liquid light guide, a lighting device is designed as a "thin" Lichtleiterbeleuchtung that introduces the required amount of light directly into the structure to be measured, so illuminates the directly measured features. Lighting of the surrounding areas is avoided. This results in a better contrasting of the structure to be measured and a reduction of the total power input and thus heat input into the measurement object.
  • Out For the sake of simplicity, fibers will be referred to below, which as a synonym for according to the invention Use to be understood light guides are understood.
  • Of the 2 is a section of the coordinate measuring machine according to 1 to refer to the essential features are related to the teaching of the invention. Around the hole 32 in the measurement object 16 to measure is an image processing camera 36 with a calculator 38 connected to the contents of the image processing camera 36 to rate recorded images. For this the measuring object becomes 16 or the features to be measured - in the present example, the bore 32 - via an imaging lens 40 on the image processing camera 36 displayed. For a specific illumination of the features to be measured, light is emitted from a light source 42 in a light guide or a fiber 44 coupled. The light is in the light guide 44 to the vicinity of the sharp plane 46 the image processing device 36 . 40 in the measuring range, ie the bore 32 passed and exits there. In the graphic representation of 2 points the light guide 44 perpendicular to its in the measuring range 32 leading portion of an exit surface 48 on that in the area of the focal plane 46 runs. In the exemplary embodiment, this serves for the light guide 44 over the exit surface 48 exiting light to illuminate the ground 50 the bore 32 , The graphic representation illustrates that through the out of the exit surface 48 leaking light the ground to be measured 50 the bore 32 illuminated and other areas of the object 16 Not. In the exemplary embodiment, the light exit surface extends 48 in a plane 50 near the sharp plane 46 in the test object 16 runs.
  • By the graphic representations should be clarified purely in principle be that the light leakage is not necessarily exactly in the focal plane must run, but can also end up at this distance. regardless of which he runs near Sharp Plane.
  • Different embodiments of optical fibers and their light emission are the 3 refer to. After the presentation of the 3a ), the light guide 44 a perpendicular to the longitudinal axis extending exit surface 54 on, so a geometry that the 2 equivalent. A related design is especially to be selected in order to use contrast autofocus z. B. to measure a hole depth, as determined by the 2 was clarified in principle.
  • The light guide 56 to 3b ) shows an embodiment in which in a mirrored surface 58 , which are inclined as at 45 ° to the longitudinal axis of the light guide 56 inclined by using the refractive index given mirror effect runs a lateral illumination z. B. an object edge of an object can be done.
  • In the example of 3c ) has a light guide 60 a ball lens on the end over which the light is emitted and which leads to a pagination of a corresponding object.
  • A light guide 64 after 3d ) also has a ball lens at the end 66 up, but down to their equatorial area 68 is opaque. This can be done by a suitable coating. Consequently, light can only be in the equatorial area 68 emerge radially.
  • According to the embodiment of 3e ) has a light guide 70 several in the exemplary embodiment spherical geometry elements 72 . 74 to achieve desired lighting effects.
  • The from the respective light exits or -trittsflächen the light guide exiting radiation is symbolized by arrows.
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
  • Cited patent literature
    • WO 002002082011 A4 [0003]
    • US 000006179439 B1 [0003]
    • US 000004893223 A [0003]
    • US 000005690417 A [0003]
    • US 000005897195 A [0003]
    • EP 000000385262 B1 [0003]
    • WO 002006114165 A1 [0003]
    • EP 000001363153 B1 [0003]
  • Cited non-patent literature
    • - ISBN 3-478-93212-2 [0030]
    • - ISBN 3-478-93290-4 [0030]

Claims (29)

  1. Method for illuminating an object to be measured with an image processing device, in particular a coordinate measuring machine, wherein light is conducted to the object via an optical waveguide, characterized in that the amount of light necessary for the illumination is conducted via the optical waveguide directly to a feature of the object to be examined and exit from Light guide is designed so that only or substantially exclusively the feature or a feature comprehensive section of the entire object under consideration is illuminated.
  2. Method according to claim 1, characterized in that that as a light guide, a glass fiber, plastic fiber or a liquid light guide is used.
  3. Method according to claim 1 or 2, characterized characterized in that the light passes over the light guide in or about the sharpness level of the image processing device directed and emerges from the light guide in this area.
  4. Method according to one of the preceding claims, characterized in that the exit of the light guide is smaller than Visual field of the image processing beam is formed.
  5. Method according to one of the preceding claims, characterized in that the exit of the light from the Optical fiber within the field of view of the image processing beam path located.
  6. Method according to one of the preceding claims, characterized in that the light exit surface of the Optical fiber is optically polished.
  7. Method according to one of the preceding claims, characterized in that the light exit surface of the Light guide is frosted.
  8. Method according to one of the preceding claims, characterized in that the light exit surface of the light guide at a defined angle, in particular 45 ° to the longitudinal axis of the light guide is bevelled.
  9. Method according to one of the preceding claims, characterized in that as light exit surface a Ball lens is provided.
  10. Method according to one of the preceding claims, characterized in that as light exit surface a Surface with partial opaque Cover is used.
  11. Method according to one of the preceding claims, characterized in that as the light exit element a plurality of balls or other bodies are arranged one above the other.
  12. Method according to one of the preceding claims, characterized in that the optical waveguide mechanically and / or is performed pivotally.
  13. Method according to one of the preceding claims, characterized in that as a light source for the light guide an LED and / or halogen lamp and / or laser diode is used.
  14. Method according to one of the preceding claims, characterized in that the optical fiber lighting arrangement via a mechanical axis parallel or perpendicular to the beam direction the illumination beam path is made adjustable.
  15. Method according to one of the preceding claims, characterized in that the light guide illumination configured is that only a narrow area of the object illuminated is significantly smaller than the field of view of the image processing beam path used is.
  16. Arrangement for measuring an object ( 16 . 32 ) with in particular a coordinate measuring machine ( 10 ) comprising a lighting arrangement ( 42 . 44 . 56 . 60 . 64 . 70 ) for illuminating the object and an image processing device ( 36 . 38 . 40 ) for measuring features of the object, the light passing through a light guide ( 44 . 56 . 60 . 64 . 70 ) guided by a light exit ( 48 . 54 . 62 . 68 . 74 ) of the light guide for illuminating the object emerges, characterized in that when measuring the light exit ( 48 . 62 . 68 . 74 ) of the light guide ( 44 . 56 . 60 . 64 . 70 ) in and / or at about the focal plane ( 46 ) of the image processing device ( 36 . 38 . 40 ) is positioned.
  17. Arrangement according to claim 16, characterized in that the light guide ( 44 . 56 . 60 . 64 . 70 ) is a glass fiber, a plastic fiber or a liquid light guide.
  18. Arrangement according to claim 16 or 17, characterized in that light exit from the light guide ( 44 . 56 . 60 . 64 . 70 ) is smaller than the field of view of the image processing beam path.
  19. Arrangement according to one of Claims 16-18. characterized in that the exit of the light from the Optical fiber within the field of view of the image processing beam path located.
  20. Arrangement according to one of claims 16-19, characterized in that the light exit surface of the Optical fiber is optically polished.
  21. Arrangement according to one of claims 16-20, characterized in that the light exit surface frosted is.
  22. Arrangement according to one of claims 16-21, characterized in that the light exit surface in a defined angle, in particular 45 ° to the optical fiber longitudinal direction bevelled.
  23. Arrangement according to one of claims 16-22, characterized in that the light exit is a ball lens.
  24. Arrangement according to one of claims 16-23, characterized in that the light exit is a surface with partial opaque cover.
  25. Arrangement according to one of Claims 16-24, characterized in that the light exit as a light exit element with several superposed balls or others Bodies is formed.
  26. Arrangement according to one of Claims 16-25. characterized in that the optical fiber mechanically and / or is designed pivotally.
  27. Arrangement according to one of claims 16-26, characterized in that the light source is an LED and / or halogen lamp and / or laser diode can be used.
  28. Arrangement according to one of claims 16-27, characterized in that the optical fiber lighting arrangement via a mechanical axis parallel or perpendicular to the beam direction the illumination beam path is made adjustable.
  29. Arrangement according to one of claims 16-28, characterized in that the light guide illumination configured is that only a narrow area of the object to be illuminated is significantly smaller than the field of view of the image processing beam path used is.
DE200810055595 2008-12-30 2008-12-30 Object i.e. hole, illuminating method, involves directly conducting light quantity to explorative feature of object, and discharging light quantity from optical fiber, and illuminating feature or section of completely observed object Withdrawn DE102008055595A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE200810055595 DE102008055595A1 (en) 2008-12-30 2008-12-30 Object i.e. hole, illuminating method, involves directly conducting light quantity to explorative feature of object, and discharging light quantity from optical fiber, and illuminating feature or section of completely observed object

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810055595 DE102008055595A1 (en) 2008-12-30 2008-12-30 Object i.e. hole, illuminating method, involves directly conducting light quantity to explorative feature of object, and discharging light quantity from optical fiber, and illuminating feature or section of completely observed object

Publications (1)

Publication Number Publication Date
DE102008055595A1 true DE102008055595A1 (en) 2010-07-01

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DE200810055595 Withdrawn DE102008055595A1 (en) 2008-12-30 2008-12-30 Object i.e. hole, illuminating method, involves directly conducting light quantity to explorative feature of object, and discharging light quantity from optical fiber, and illuminating feature or section of completely observed object

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4893223A (en) 1989-01-10 1990-01-09 Northern Telecom Limited Illumination devices for inspection systems
EP0385262B1 (en) 1989-03-02 1995-08-23 Firma Carl Zeiss Observation apparatus with reflecting object illumination appliance
US5690417A (en) 1996-05-13 1997-11-25 Optical Gaging Products, Inc. Surface illuminator with means for adjusting orientation and inclination of incident illumination
US5897195A (en) 1997-12-09 1999-04-27 Optical Gaging, Products, Inc. Oblique led illuminator device
US6179439B1 (en) 1998-06-10 2001-01-30 Optical Gaging Products, Inc. High-incidence programmable surface illuminator for video inspection systems
WO2002082011A1 (en) 2001-04-03 2002-10-17 Werth Messtechnik Gmbh Illumination device and method for illuminating an object
EP1363153B1 (en) 2002-05-17 2006-01-25 Mitutoyo Corporation Ring illuminator
WO2006114165A1 (en) 2005-04-22 2006-11-02 Mahr Okm Gmbh Device and method for the optical measurement of objects to be measured

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4893223A (en) 1989-01-10 1990-01-09 Northern Telecom Limited Illumination devices for inspection systems
EP0385262B1 (en) 1989-03-02 1995-08-23 Firma Carl Zeiss Observation apparatus with reflecting object illumination appliance
US5690417A (en) 1996-05-13 1997-11-25 Optical Gaging Products, Inc. Surface illuminator with means for adjusting orientation and inclination of incident illumination
US5897195A (en) 1997-12-09 1999-04-27 Optical Gaging, Products, Inc. Oblique led illuminator device
US6179439B1 (en) 1998-06-10 2001-01-30 Optical Gaging Products, Inc. High-incidence programmable surface illuminator for video inspection systems
WO2002082011A1 (en) 2001-04-03 2002-10-17 Werth Messtechnik Gmbh Illumination device and method for illuminating an object
EP1363153B1 (en) 2002-05-17 2006-01-25 Mitutoyo Corporation Ring illuminator
WO2006114165A1 (en) 2005-04-22 2006-11-02 Mahr Okm Gmbh Device and method for the optical measurement of objects to be measured

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ISBN 3-478-93212-2
ISBN 3-478-93290-4

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