EP2165186A1 - Dispositif pour représenter la surface intérieure d'un espace creux de préférence cylindrique - Google Patents

Dispositif pour représenter la surface intérieure d'un espace creux de préférence cylindrique

Info

Publication number
EP2165186A1
EP2165186A1 EP08784598A EP08784598A EP2165186A1 EP 2165186 A1 EP2165186 A1 EP 2165186A1 EP 08784598 A EP08784598 A EP 08784598A EP 08784598 A EP08784598 A EP 08784598A EP 2165186 A1 EP2165186 A1 EP 2165186A1
Authority
EP
European Patent Office
Prior art keywords
image
cavity
output signals
cartesian
optics
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.)
Ceased
Application number
EP08784598A
Other languages
German (de)
English (en)
Inventor
Hubert Keller
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.)
Jenoptik Industrial Metrology Germany GmbH
Original Assignee
Hommel Etamic 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 Hommel Etamic GmbH filed Critical Hommel Etamic GmbH
Publication of EP2165186A1 publication Critical patent/EP2165186A1/fr
Ceased 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
    • G01N21/954—Inspecting the inner surface of hollow bodies, e.g. bores
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B37/00—Panoramic or wide-screen photography; Photographing extended surfaces, e.g. for surveying; Photographing internal surfaces, e.g. of pipe
    • G03B37/005—Photographing internal surfaces, e.g. of pipe
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B37/00—Panoramic or wide-screen photography; Photographing extended surfaces, e.g. for surveying; Photographing internal surfaces, e.g. of pipe
    • G03B37/04—Panoramic or wide-screen photography; Photographing extended surfaces, e.g. for surveying; Photographing internal surfaces, e.g. of pipe with cameras or projectors providing touching or overlapping fields of view
    • 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
    • G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
    • G01N2021/8887—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges based on image processing techniques
    • 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
    • G01N21/954—Inspecting the inner surface of hollow bodies, e.g. bores
    • G01N2021/9542—Inspecting the inner surface of hollow bodies, e.g. bores using a probe
    • 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
    • G01N21/954—Inspecting the inner surface of hollow bodies, e.g. bores
    • G01N2021/9542—Inspecting the inner surface of hollow bodies, e.g. bores using a probe
    • G01N2021/9544—Inspecting the inner surface of hollow bodies, e.g. bores using a probe with emitter and receiver on the probe

Definitions

  • the invention relates to a device referred to in the preamble of claim 1 for imaging the inner surface of a preferably cylindrical cavity in a workpiece.
  • a device is known from DE 198 06 261 B4.
  • the optics have the shape of an endoscope, which is moved linearly, whereby individual images are available as primary images. These are captured by a digital camera and first stored in digital form and then converted to a rectangular image by a polar coordinate transformation, in which the primary images are combined to form an overall image of the interior surface of the cavity.
  • the processing and transformation of the primary images is based on their entire information content, with the result that the time for processing the signals is relatively large.
  • the purpose of imaging an inner surface of a cylindrical cavity in a workpiece is to inspect the surface for defects and faulty ones
  • Eliminate components This is particularly important in the automotive industry, where functionally relevant holes are mass-produced, for example in brake cylinders, calipers, connecting rods, pistons, engine Cylinders, cylinder liners or bearing bushes.
  • Such a test has hitherto been carried out by visual inspection and, of course, with the limitations of visual inspection.
  • the aim is to perform a piece-by-piece check while automating the
  • the invention is therefore an object of the invention to provide a device referred to in the preamble of claim 1, in which the time for the test is so low that a piece-by-piece examination, in particular an automatic test done can.
  • the problem underlying the invention is achieved by the teaching set forth in claim 1.
  • the basic idea of the invention is that the digital image recorder, which receives the all-around image taken by the optics, produces only output signals corresponding to an annular band on the inner surface of the cavity, such that the output signal contains only information about this annular band. This results in a considerable reduction of the information content. These reduced output signals then form the image content of the lines of a Cartesian overall image, which is generated as a result. The gradual advance of the optics each new lines are strung together, so that the overall picture is created.
  • the invention takes advantage of the fact that there are available high-speed digital imagers capable of capturing 1,000 frames per second and producing corresponding image signals.
  • the digital image recorder has a matrix-shaped pixel arrangement as well as a digital read-out window which is programmed so that only Output signals corresponding to the annular band are generated on the inner surface of the cavity. Since in this embodiment an image sensor with matrix-shaped pixel arrangement can be used, in this way it is possible to realize the basic idea of the invention with a relatively simple and inexpensive standard hardware.
  • the image sensor has a ring sensor, in which the pixels are arranged on an annular surface.
  • the ring sensor detected from the outset only the required area for the evaluation.
  • Such ring sensors are available and have 2048 pixels, for example, on an annular surface with an outer diameter of 10 mm.
  • any other image pickup arrangements can be used by means of which an annular band can be imaged on the inner surface of the cavity.
  • a matrix sensor with random pixel access can be used, in which only those pixels are accessed to which the annular band is imaged. Since the remaining pixels are not evaluated, even in such an embodiment the information content is reduced the teaching of the invention.
  • any other techniques can be used by means of which an annular zone can be scanned, for example by using a fixed image recorder and rotating the image via a prism arrangement.
  • a micromirror array or a DLP digital light processor
  • the annular band is always detected on the inner surface of the cavity and converted into a line of Cartesian overall picture.
  • the axial feed of the optical system thus successively adds lines to the Cartesian image so that the overall cartesian image results after completion of the axial feed motion, which can be evaluated in a quick and simple manner.
  • means which analyze the image content of the lines of the Cartesian image and pass the output signals only when an adjustable limit value is exceeded to the means for generating a Cartesian image.
  • an adjustable limit value is exceeded to the means for generating a Cartesian image.
  • only the surface defects are shown, whereby the surface defects which are to be displayed can be determined by setting the limit value.
  • a lighting source for all-round lighting is fixedly arranged in the field of optics.
  • the illumination is unnecessary over a remote from the optic light source whose light is passed, for example, through a light guide.
  • the illumination source is an LED light source.
  • FIG. 1 shows a first embodiment of a device according to the invention together with a workpiece
  • Fig. 2 shows a second embodiment of a device according to the invention
  • Fig. 3 shows schematically the receiving surface of a
  • FIG. 4 schematically shows the storage of a circle recorded by the image recorder
  • FIG. 5 shows the formation of a Cartesian image
  • FIG. 6 shows schematically the development of the interior surface of the hole.
  • the device according to FIG. 1 has an all-round 360 ° optical system 2, for example a fisheye optical system, so that it images a cylindrical inner surface 4 of a bore 6 in a workpiece 8 on a digital image recorder 10 in this exemplary embodiment.
  • the optic 2 is designed in the manner of an endoscopic optic, which is arranged on a holder 12 and is moved by an electromotive feed drive 14 so as to move the optic 2 in the axial direction through the bore 6.
  • the illumination of the cylindrical inner surface 4 is effected by a light source 16, which in this exemplary embodiment is a light-emitting diode or a high-power laser diode which emits light continuously or in a pulsed manner.
  • the output signal of the image recorder 10 passes via a line 18 into an evaluation computer 20, the function of which will be explained below with reference to FIGS. 3 to 6.
  • Fig. 2 shows a second embodiment of a device according to the invention, which is suitable for use in larger holes compared to the embodiment of FIG.
  • the imager 10 is in the
  • a ring light which may be formed for example by an LED array.
  • FIG. 3 initially shows the receiving surface of the image recorder 10, in which an evaluation window is programmed such that a ring window 22 is arranged between an outer window ren circular ring 24 and an inner circular ring 26 is open, so that only from the area of this ring window 22 image signals are transmitted from the image sensor 10.
  • Fig. 4 illustrates how the evaluation computer 20 forms over the circumference of the cylindrical inner surface 4 of 0 ° to 360 ° line strip 28, which are stored sequentially in dependence on the provided by the feed drive 14 axial position of the lens 2 in the drawing in the vertical direction , so that within a Cartesian image surface 30 shown in FIG. 5 with corner points 32, 34, 36 and 38 image signals are generated which serve to represent a development 40, as shown schematically in FIG.
  • annular bands are imaged on the inner surface 4 of the bore 6 and converted into lines of a Cartesian image in the manner described above.
  • an overall Cartesian image is created which represents the entire surface of the bore 6 to be examined.
  • the axial feed of the optics 2 can be carried out stepwise, for example, wherein the axial step size can be chosen in particular so that the respectively recorded annular bands on the inner surface of the Bore 6 in the axial direction seamlessly and without overlapping connect to each other.
  • the feed drive 14 and the evaluation computer 20 are in data transmission connection, as indicated in Fig. 1 by the reference numeral 42.
  • a ring sensor in which the pixels are arranged on an annular surface can also be used according to the invention.
  • Such an embodiment has the advantage that only output signals corresponding to a respective annular band are recorded on the inner surface 4 of the cavity, so that a selection of the recorded output signals, for example via a programmed readout window, is not required.

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)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

L'invention concerne un dispositif pour représenter une surface intérieure (4) d'un espace creux de préférence cylindrique dans une pièce (8), lequel présente une optique (2) avec vision périphérique de préférence sur 360°, des moyens pour faire avancer l'optique (2) perpendiculairement au plan de la vision périphérique, un enregistreur d'image numérique (10) doté d'une surface d'acquisition d'image plane sur laquelle est représentée l'image périphérique enregistrée par l'optique (2) ainsi que des moyens qui, à partir des signaux de sortie numériques de l'enregistreur d'image (10), génèrent une image cartésienne qui est un développé (40) de la surface intérieure de l'espace creux. Conformément à l'invention, l'enregistreur d'image numérique (10) est configuré de telle sorte que seuls sont générés des signaux de sortie correspondant à une bande annulaire sur la surface intérieure du corps creux dans un plan pour l'essentiel transversal par rapport à la direction de l'avance pas à pas de l'optique et, selon l'invention, ces signaux de sortie forment le contenu d'image des lignes d'une image globale cartésienne.
EP08784598A 2007-07-05 2008-07-02 Dispositif pour représenter la surface intérieure d'un espace creux de préférence cylindrique Ceased EP2165186A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007031358.8A DE102007031358B4 (de) 2007-07-05 2007-07-05 Vorrichtung zur Abbildung der Innenfläche eines zylindrischen Hohlraums
PCT/EP2008/005393 WO2009003692A1 (fr) 2007-07-05 2008-07-02 Dispositif pour représenter la surface intérieure d'un espace creux de préférence cylindrique

Publications (1)

Publication Number Publication Date
EP2165186A1 true EP2165186A1 (fr) 2010-03-24

Family

ID=39717529

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08784598A Ceased EP2165186A1 (fr) 2007-07-05 2008-07-02 Dispositif pour représenter la surface intérieure d'un espace creux de préférence cylindrique

Country Status (3)

Country Link
EP (1) EP2165186A1 (fr)
DE (2) DE102007031358B4 (fr)
WO (1) WO2009003692A1 (fr)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009019459B4 (de) 2009-05-04 2012-02-02 Hommel-Etamic Gmbh Vorrichtung zur Abbildung der Innenfläche eines Hohlraumes in einem Werkstück
DE202009006425U1 (de) 2009-05-05 2009-07-23 Hommel-Etamic Gmbh Vorrichtung zum Abbilden der Innenfläche eines vorzugsweise zylindrischen Hohlraumes in einem Werkstück
CN102597753B (zh) * 2009-11-18 2014-12-10 本田技研工业株式会社 表面检查装置以及表面检查方法
DE102010035147B4 (de) 2010-08-23 2016-07-28 Jenoptik Industrial Metrology Germany Gmbh Meßvorrichtung
DE102011013089A1 (de) 2011-03-04 2012-09-06 Hommel-Etamic Gmbh Kurbelwellen-Prüfverfahren
DE102011079067A1 (de) * 2011-07-13 2013-01-17 Robert Bosch Gmbh Verfahren und Vorrichtung für eine Rundumsichtinspektion
DE102011079068A1 (de) * 2011-07-13 2013-01-17 Robert Bosch Gmbh Verfahren und Vorrichtung für eine Rundumsichtinspektion
DE202011111089U1 (de) 2011-11-04 2019-06-13 Jenoptik Industrial Metrology Germany Gmbh Vorrichtung zur Abbildung der Innenfläche eines Hohlraumes in einem Werkstück
DE102012018580B4 (de) 2012-09-20 2015-06-11 Jenoptik Industrial Metrology Germany Gmbh Messvorrichtung und Messverfahren zur Inprozess-Messung an Prüflingen während eines Bearbeitungsvorganges an einer Bearbeitungsmaschine, insbesondere einer Schleifmaschine
DE102014108431A1 (de) * 2014-06-16 2015-12-17 Bayerische Motoren Werke Aktiengesellschaft Verfahren und Messvorrichtung zum Überprüfen einer Zylinderbohrung
DE102014118753A1 (de) 2014-10-01 2016-04-07 Jenoptik Industrial Metrology Germany Gmbh Prüfvorrichtung
DE102015209455A1 (de) * 2015-05-22 2016-11-24 Sac Sirius Advanced Cybernetics Gmbh Vorrichtung und Verfahren zur optischen Erfassung von Innenwandungen
DE102015010225B4 (de) 2015-08-12 2017-09-21 Jenoptik Industrial Metrology Germany Gmbh Bohrungsinspektionsvorrichtung
DE102016113400B4 (de) 2015-08-19 2023-11-30 Jenoptik Industrial Metrology Germany Gmbh Bohrungsinspektionsvorrichtung und Bohrungsinspektionsverfahren
DE102017111819B4 (de) 2017-05-30 2021-07-22 Jenoptik Industrial Metrology Germany Gmbh Bohrungsinspektionsvorrichtung
SE541623C2 (en) * 2017-10-11 2019-11-12 Chris Marine Ab Liner imaging device and a method for establishing an image of an inner wall of a liner
DE102019106851B4 (de) 2019-03-18 2023-06-07 Jenoptik Industrial Metrology Germany Gmbh Kalibrierverfahren und Kalibrierhilfsmittel
DE102021105629A1 (de) 2020-03-12 2021-09-16 Jenoptik Industrial Metrology Germany Gmbh Bohrungsinspektionsvorrichtung
WO2023281359A1 (fr) * 2021-07-07 2023-01-12 Coursebricks Système et procédé d'inspection automatisée de composants à l'aide d'un complément d'images et de modèles de vision artificielle
DE102022102155B4 (de) 2022-01-31 2023-12-28 Jenoptik Industrial Metrology Germany Gmbh Kalibrierhilfsmittel und Verfahren zur Herstellung des Kalibrierhilfsmittels
DE102022125115A1 (de) 2022-09-29 2024-04-04 Jenoptik Industrial Metrology Germany Gmbh Optisches Messverfahren
DE102022131398A1 (de) 2022-11-28 2024-05-29 Jenoptik Industrial Metrology Germany Gmbh Bohrungsinspektionsvorrichtung

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AT408385B (de) 1999-04-30 2001-11-26 Festo Ges M B H Verfahren und vorrichtung zur erfassung eines abbildes einer im wesentlichen zylindrischen oberfläche
DE60141025D1 (de) 2000-05-30 2010-02-25 Oyo Corp Vorrichtung und verfahren zum erkennen von defekten oder beschädigungen in abwasserleitungen
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US7336833B2 (en) 2004-06-30 2008-02-26 Given Imaging, Ltd. Device, system, and method for reducing image data captured in-vivo

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Also Published As

Publication number Publication date
DE102007031358B4 (de) 2023-03-16
DE202008008725U1 (de) 2008-09-25
DE102007031358A1 (de) 2009-03-26
WO2009003692A1 (fr) 2009-01-08

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