WO1999039232A1 - Dispositif de balayage optique d'un objet - Google Patents

Dispositif de balayage optique d'un objet Download PDF

Info

Publication number
WO1999039232A1
WO1999039232A1 PCT/EP1998/007433 EP9807433W WO9939232A1 WO 1999039232 A1 WO1999039232 A1 WO 1999039232A1 EP 9807433 W EP9807433 W EP 9807433W WO 9939232 A1 WO9939232 A1 WO 9939232A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
light guides
lens
light guide
housing
Prior art date
Application number
PCT/EP1998/007433
Other languages
German (de)
English (en)
Inventor
Hans-Günter Vosseler
Original Assignee
Vosseler Zweite Patentverwertungsgesellschaft Mbh
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 Vosseler Zweite Patentverwertungsgesellschaft Mbh filed Critical Vosseler Zweite Patentverwertungsgesellschaft Mbh
Publication of WO1999039232A1 publication Critical patent/WO1999039232A1/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
    • G02B23/2407—Optical details
    • G02B23/2461—Illumination
    • G02B23/2469—Illumination using optical fibres

Definitions

  • the invention relates to a device for optically scanning an object with a plurality of light guides, which are arranged concentrically to form at least one light guide ring, and with an illumination device which is assigned to the proximal end of the light guide.
  • optical test methods are used, in which cameras control the manufacturing process, i.e. optically capture the products.
  • image processing programs the data of the captured products can be compared with stored reference data in order to identify deviations from the norm.
  • the disadvantage of these test methods is, in particular, that the calculated image data cannot provide information, for example, about the surface course of the detected product, since the measurements are carried out in two dimensions. This two-dimensional quality inspection therefore very often does not meet the required requirements, so that additional personnel are required to carry out visual inspections.
  • the degree of automation and thus the cost structure deteriorate due to the necessary deployment of personnel.
  • the use of mirrors, optical fiber-based endoscopes or similar optical instruments allows an indirect visual inspection of inaccessible places, but the optical quality of such a test object is limited, so that small damage, cracks etc. are not recognized.
  • there is a lack of spatial information from the investigated bodies as is the case with a direct visual inspection.
  • the object of the present invention is therefore to create a device which enables three-dimensional detection of objects or object spaces even at inaccessible locations.
  • This object is achieved in a device of the type mentioned in the introduction in that a selection device is provided which enables selective light irradiation into certain light guides and thus the projection of a pattern.
  • the device according to the invention enables three-dimensional data of the object to be determined with the aid of certain known optical methods, for example the triangulation method or the phase shift method.
  • the selection device can be used to project a selectable pattern, for example in the form of rings, lines or individual points, onto the object to be measured.
  • the projected pattern can then preferably be optically recorded using a recording device and, for example, converted into three-dimensional data using an evaluation unit.
  • a housing with a very small cross-sectional area can be realized, which also enables testing of difficult to access places, for example bores in housings.
  • the three-dimensional detection of the surface of the object enables inspection with high quality.
  • the surface of the object can be reproduced three-dimensionally in order to enable a visual assessment.
  • distance measurements and dimension measurements can be carried out.
  • the three-dimensional data can be compared with the reference data, so that a subjectively failed test by one person can be dispensed with.
  • the selection device comprises an optical diaphragm.
  • an optical grating is also to be understood as an optical grating.
  • the lighting device comprises a multiplicity of power light-emitting diodes (LEDs) which can be selectively controlled by means of the selection device, one power LED being assigned to one or more light guides.
  • LEDs power light-emitting diodes
  • the receiving device has a CCD sensor which is arranged at the distal end of the light guide.
  • the receiving device comprises a CCD sensor at the proximal end of the light guide and at least one light channel, preferably comprising at least one light guide, which runs coaxially with the plurality of light guides.
  • the CCD sensor is housed in an area of the device that is very well protected from damage.
  • an objective device assigned to the distal end of the light guide and a housing which at least partially accommodates the light guides are preferably provided, the housing preferably being tubular and flexible, the light channel preferably comprising at least one light guide.
  • the housing is tubular and rigid, a rod lens system preferably being arranged in the light channel.
  • the light reflected from the object can be transmitted to the CCD sensor with only slight losses.
  • the lighting device is arranged in such a way that irradiation of the light that is axially parallel with respect to the light guide is made possible.
  • the objective device has an objective assigned to the plurality of light guides and an objective assigned to the receiving device.
  • the objective device has an objective assigned to a light guide.
  • the image quality of the pattern can be significantly increased again.
  • the device is designed as an endoscope. 6
  • FIG. 1 a shows a first exemplary embodiment of the invention in a schematic sectional illustration
  • FIG. 1b shows a schematic sectional illustration of a second exemplary embodiment of the invention
  • FIG. 1 c shows a schematic sectional illustration of a third exemplary embodiment of the invention
  • FIG. 2a shows a perspective view of an endoscope according to the invention with a flexible housing, the distal end not being shown, and
  • Figure 2b is a perspective view of an endoscope according to the invention with a rigid housing, the distal end is not shown. 7
  • An endoscope 10 is shown in a schematic sectional illustration in FIG.
  • the endoscope 10 is used for the optical three-dimensional detection of objects 12 or their surfaces.
  • the endoscope 10 comprises an elongated housing 14 which has a distal end 16 and a proximal end 18.
  • the housing 14 is divided into three longitudinal sections, namely a receiving section 20a at the proximal end 18, an adjoining coupling section 20b and a transmission section 20c which ends at the distal end 16.
  • the three longitudinal sections 20a, 20b and 20c are preferably detachably connected to one another, which is indicated schematically by means of lines 22a and 22b.
  • the housing 14 is tubular, with a preferably square or circular cross section.
  • the transmission section 20c is rigid or flexible, while the other two longitudinal sections 20a, 20b are rigid. All three longitudinal sections 20a to 20c of the housing 14 are preferably made of metal.
  • the transmission section 20c of the housing 14 - viewed in cross section - is divided into an inner circular receiving channel 24 and an annular projection channel 26 arranged coaxially to the receiving channel 24. While the projection channel 26 ends within the coupling section, the receiving channel 24 completely penetrates the coupling section 20b and ends in the Receiving section 20a.
  • a receiving device 28 is optically coupled to the proximal end of the receiving channel 24, which includes in particular an optical system 30, for example in the form of a lens, and a CCD sensor 32.
  • the CCD sensor 32 and the optics 30 are aligned with one another in such a way that the light reflected from the object 12 can be sharply imaged on the CCD sensor 32.
  • Optics 30 are preferably arranged so as to be displaceable in the longitudinal direction for focusing.
  • the light rays reflected by the object 12 are transmitted from the distal end 16 of the housing 14 to the receiving device 28 by means of an ordered bundle of light guides which extend within the receiving channel 24 over its entire length. These light guides are indicated by means of lines 34 in FIG.
  • the pattern to be projected onto the object 12 is generated by a projection device 36 and is coupled into an ordered bundle of light guides, which are only indicated in FIG. 1 a and are identified by the reference number 40.
  • the bundle 38 is separated into a ring and extends in the projection channel 26 to the distal end 16 of the housing 14.
  • the individual light guides 40 are arranged in a ring within the projection channel 26, so that a multiplicity of rings 42 train.
  • a total of three rings 42 can be seen in the present exemplary embodiment, this being merely an example.
  • the number of rings 42 can be significantly higher, with which the resolution can be increased.
  • the radial distance between adjacent rings and / or adjacent light guides should preferably be selected so that the projection lines or projection points on the object can be distinguished from one another.
  • the bundle running in the receiving channel 34 is not shown in the sectional illustration A-A. Rather, the CCD sensor 32 can be seen.
  • the projection device 36 can be designed as an external structural unit, the bundle 38 being led out of the housing 14, as shown in FIG. However, the projection device can also be integrated into the housing 14.
  • a lens device 42 is arranged at the distal end 16 of the housing 14.
  • the lens device 42 comprises a lens 44 assigned to the light guides 40 and a lens 46 assigned to the light guides 34 of the receiving channel 24.
  • the two lenses 44, 46 can be moved in the longitudinal direction for focusing.
  • the entire lens device 42 is preferably displaceable in the longitudinal direction and can be removed if necessary, so that it can be easily replaced.
  • a particularly good projection result can be achieved if each light guide 40 in the projection channel 26 is assigned its own objective, for example in the form of a lens.
  • the projection device 36 comprises an illumination unit 48 and a selection device 50.
  • the illumination device 48 has at least one lamp 52, which should be a large-area light source.
  • the selection device 50 is designed as an optical diaphragm 52, which enables the light 52 to selectively irradiate individual light guides 40 of the bundle 38.
  • certain patterns can be projected onto the object 12. If, for example, it is a ring diaphragm, individual rings 42 of the bundle 38 can be selected so that the projected pattern encircles one or more rings. 10
  • the ring diaphragm can be set manually or automatically, for example.
  • ring-shaped patterns is advantageous because of their symmetry. With certain surface courses to be recorded, however, better results can be achieved with other patterns, such as lines, etc.
  • the aperture within the selection device 50 is held releasably, in such a way that it can be replaced at any time and in a simple manner by another aperture, for example a line aperture.
  • another aperture for example a line aperture.
  • optical gratings are also to be understood as screens.
  • Such an optical grating is required, for example, to carry out the phase shift method, this grating being mounted so as to be displaceable transversely to the beam direction.
  • the pattern generated by the projection device 36 and reflected by the object 12 is detected by the CCD sensor 32 and transmitted as an electrical signal to an evaluation device 54.
  • the evaluation device 54 evaluates the electrical signals on the basis of known optical measurement methods, for example the triangulation method or the phase shift method, and calculates distance values, for example.
  • the projection device 36 is brought into a defined distance from a known object onto which a known pattern is projected.
  • the projection surface of the object has a large number of elevations, the dimensions of which are known.
  • the data evaluated by the evaluation device 54 are then set in relation to the known dimension data of the projection surface, the result in the evaluation device 54 is stored. These values are then included in the calculation for subsequent measurements of other objects.
  • the distance of the surface area irradiated with a mark (for example a light point) to a reference plane is determined with the aid of certain angular functions. If this measurement is carried out for the entire surface of the object, with the distance between the endoscope and the object not changing during the measurement, a “distance value field” is created which then contains the information about the surface course of the object with respect to a reference plane.
  • phase shift method In the phase shift method, several images of the object are taken, the optical grating being shifted by a small amount (depending on the grating constant). A distance value field can then be calculated from these various recordings with the aid of known algorithms.
  • the evaluation device 54 then creates a pseudo-three-dimensional image of the object 12 or the recorded object surface on the basis of the calculated distance value field, which is displayed on a screen 56.
  • the evaluation device 54 controls the projection device 36 in order to select the correspondingly necessary pattern in the selection device 50.
  • the evaluation device 54 ensures, for example, that the aperture 52 in the selection device 50 is shifted by a defined distance.
  • An increase in the flexibility of the system can be achieved with an illumination device 48 which comprises a multiplicity of power LEDs 56.
  • the number of power LEDs preferably corresponds to the number of light guides 40 contained in bundle 38, in which case a power LED 56 is assigned to each light guide 40.
  • the selection device 50 is then designed as an electronic control which controls the corresponding power LEDs 56 depending on the desired pattern.
  • the advantage of this variant is in particular that the pattern can be adapted to the surface of the object, which significantly improves the measurement quality.
  • FIG. 1b shows a second exemplary embodiment of an endoscope 10, parts which correspond to the first exemplary embodiment being identified by the same reference numerals. Therefore, they will not be described again.
  • the difference compared to the first exemplary embodiment lies in the design of the receiving channel 24.
  • a rod lens unit 58 is preferably arranged in the receiving channel 24 in the region of the distal end of the housing 14. Dispensing with light guides, however, presupposes that the transmission section 20c is rigid and straight.
  • FIG. 1c A further exemplary embodiment of an endoscope 10 "is shown in FIG. 1c. Here too, parts that correspond to the first exemplary embodiment are included 13
  • the receiving device 28 ′ is not arranged in the area of the proximal end 18 but in the area of the distal end 16. It is therefore no longer necessary to guide the light reflected by the object 12 through the receiving channel 24. The result is an improvement in the recording quality, since transmission losses caused by reflection, for example, are avoided.
  • FIGS. 2a and 2b two endoscopes 10, 10 'are again shown in perspective, the two endoscopes differing only in the design of the transmission section 20c.
  • the transmission section 20c is flexible in the form of a tube, while the transmission section 20c of the endoscope 10 'according to FIG. 2b is a rigid tube.
  • the lens device 42 is omitted at the distal end 16, so that the ring-shaped optical waveguides 42 in the projection channel 26 and the receiving channel 24 can be seen.
  • the described endoscopes 10, 10 ', 10 can be used in many technical fields, whereby they are primarily used to test surfaces that are difficult or impossible for the user to see. In particular, 10 cavities can be examined with the described endoscopes. 14
  • the selection device 50 it is advantageously possible to generate optical patterns which are necessary for the optical measurement of the object 12 using known optical measurement methods.
  • distance measurements can be carried out, whereby the individual distance values can be calculated using the triangulation method.
  • the phase shift method can also be used.
  • other optical measuring methods can also be used. For example, it is conceivable to record the object from different positions by moving the endoscope and to calculate a three-dimensional image from these recordings.

Landscapes

  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Endoscopes (AREA)
  • Instruments For Viewing The Inside Of Hollow Bodies (AREA)

Abstract

L'invention concerne un dispositif de balayage optique d'un objet, se présentant de préférence sous forme d'endoscope, qui comprend un boîtier (14) oblong, une pluralité de fibres optiques (40), disposées de manière concentrique dans le boîtier (14), afin de former plusieurs anneaux de fibres optiques (42), un dispositif d'éclairage (36) associé à l'extrémité proximale des fibres optiques, un système d'objectif (42), associé à l'extrémité distale des fibres optiques (40), ainsi qu'un dispositif de prise de vues (28) pour la détection optique d'un objet (12). L'invention se caractérise en ce qu'il est prévu un dispositif de sélection (50), qui permet un rayonnement incident sélectif de la lumière dans des fibres optiques (40) déterminées. Le dispositif de prise de vues (28) est conçu de manière à enregistrer la lumière réfléchie par l'objet (12). Une unité d'évaluation (54) servant à dériver des données tridimensionnelles de l'objet (12), à partir de la lumière enregistrée, peut être connectée.
PCT/EP1998/007433 1998-01-30 1998-11-19 Dispositif de balayage optique d'un objet WO1999039232A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803679.5 1998-01-30
DE1998103679 DE19803679C2 (de) 1998-01-30 1998-01-30 Vorrichtung zur optischen Abtastung eines Objekts, insbesondere Endoskop

Publications (1)

Publication Number Publication Date
WO1999039232A1 true WO1999039232A1 (fr) 1999-08-05

Family

ID=7856184

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1998/007433 WO1999039232A1 (fr) 1998-01-30 1998-11-19 Dispositif de balayage optique d'un objet

Country Status (2)

Country Link
DE (1) DE19803679C2 (fr)
WO (1) WO1999039232A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8040527B2 (en) 2007-02-02 2011-10-18 Siemens Aktiengesellschaft Refractive production of a concentrically fanned structured bundle of light beams, optical, measuring device with refractive defection element

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002016865A2 (fr) * 2000-08-25 2002-02-28 3Shape Aps Objet et procede destines a l'etalonnage d'un systeme de balayage lumineux tridimensionnel
US7625335B2 (en) 2000-08-25 2009-12-01 3Shape Aps Method and apparatus for three-dimensional optical scanning of interior surfaces
BE1013674A3 (nl) * 2000-09-06 2002-06-04 Tenneco Automotive Europ Nv Inrichting voor het inspecteren van voertuigonderdelen en werkwijze die gebruik maakt van dergelijke inrichting.
ATE539562T1 (de) 2001-03-02 2012-01-15 3Shape As Verfahren zum individuellen anpassen von hörmuscheln
DE10242607B4 (de) * 2002-09-12 2005-04-21 Olympus Winter & Ibe Gmbh Endoskop mit Lichtleiterbündel
DE102009043538A1 (de) 2009-09-30 2011-03-31 Siemens Aktiengesellschaft Messendoskop
DE102010025752A1 (de) * 2010-06-30 2012-01-05 Siemens Aktiengesellschaft Endoskop
DE102010050227A1 (de) * 2010-11-04 2012-05-10 Siemens Aktiengesellschaft Endoskop mit 3D-Funktionalität
DE102013200898A1 (de) * 2013-01-21 2014-07-24 Siemens Aktiengesellschaft Endoskop, insbesondere für die minimal-invasive Chirurgie
DE102014210619A1 (de) * 2014-06-04 2015-12-17 Olympus Winter & Ibe Gmbh Endoskop mit berührungsloser Abstandsmessung
DE102015201561A1 (de) 2015-01-29 2016-08-04 Rolls-Royce Deutschland Ltd & Co Kg Messkopf einer endoskopischen Vorrichtung und Verfahren zur Inspektion und Messung eines Objektes

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4678900A (en) * 1984-07-05 1987-07-07 Olympus Optical Co., Ltd. Illuminating optical system for endoscopes
GB2231231A (en) * 1989-01-06 1990-11-07 Pearpoint Ltd Miniature TV camera inspection system
EP0416371A2 (fr) * 1989-09-04 1991-03-13 Richard Wolf GmbH Optique pour endoscope
WO1993017362A1 (fr) * 1992-02-19 1993-09-02 United States Surgical Corporation Tube d'observation optique

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2846852A1 (de) * 1978-10-25 1980-05-08 Siemens Ag Vorrichtung zur daempfungsmessung an optischen uebertragungselementen
US4571023A (en) * 1983-04-11 1986-02-18 Sumitomo Electric Industries, Ltd. Device for observing pictures
JPH0789178B2 (ja) * 1986-12-19 1995-09-27 オリンパス光学工業株式会社 外付けカメラを用いた内視鏡用自動調光装置
DE3914825C1 (fr) * 1989-05-05 1990-09-13 Aesculap Ag
DE4304530C2 (de) * 1992-02-14 1994-12-22 Norbert Lemke Einrichtung zur Beleuchtung von insbesondere von einer Videokamera aufgenommenen Objekten
DE4225507C2 (de) * 1992-08-01 1995-12-14 Zeiss Carl Fa Stereoskopisches Endoskop

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4678900A (en) * 1984-07-05 1987-07-07 Olympus Optical Co., Ltd. Illuminating optical system for endoscopes
GB2231231A (en) * 1989-01-06 1990-11-07 Pearpoint Ltd Miniature TV camera inspection system
EP0416371A2 (fr) * 1989-09-04 1991-03-13 Richard Wolf GmbH Optique pour endoscope
WO1993017362A1 (fr) * 1992-02-19 1993-09-02 United States Surgical Corporation Tube d'observation optique

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8040527B2 (en) 2007-02-02 2011-10-18 Siemens Aktiengesellschaft Refractive production of a concentrically fanned structured bundle of light beams, optical, measuring device with refractive defection element

Also Published As

Publication number Publication date
DE19803679C2 (de) 2000-03-09
DE19803679A1 (de) 1999-08-19

Similar Documents

Publication Publication Date Title
DE69010785T2 (de) System zum Messen von durch ein Endoskop beobachteten Gegenständen.
DE102009001086B4 (de) Handgehaltene dentale Kamera und Verfahren zur optischen 3D-Vermessung
EP3056934B1 (fr) Tete de mesure d'un dispositif endoscopique et procede d'inspection et mesure d'un objet
EP0419936B1 (fr) Procédé et dispositif pour la détection de phase de rayonnement notamment de rayonnement lumineux
EP0730430B1 (fr) Dispositif pour l'examen de tissus a la lumiere
DE10308383A1 (de) Verfahren und optisches System zur Vermessung der Topographie eines Meßobjekts
EP0829726A1 (fr) Procédé et dispositif pour enregistrer des structures de courant tridimensionnelles
DE2337219A1 (de) Optischer messkopf zur abstandsanzeige
WO1999039232A1 (fr) Dispositif de balayage optique d'un objet
DE4136002A1 (de) Moire- konturenabbildungsvorrichtung
EP3611463A1 (fr) Dispositif de mesure pourvu d'agencement de mesure optique et procédé de réalisation d'une mesure optique de distance au moyen d'un tel agencement de mesure
DE102015001032A1 (de) Raman-Spektroskopie-Beleuchtungs- und Auslesesystem
DE3044611A1 (de) Verfahren und vorrichtung zur erkennung von querschnittsprofilen von objekten
EP0682226A2 (fr) Dispositif pour vérifier l'état d'une surface
DE19742264C2 (de) Endoskop
DE4113279C2 (de) Konfokales optisches Rastermikroskop
EP0115267A2 (fr) Système d'image
CH697319B1 (de) Verfahren und Vorrichtung zum geometrischen Kalibrieren von optoelektronischen Messbildkameras.
DE19632829A1 (de) Verfahren und Vorrichtung zur Bestimmung von Linsenparametern
DE3244484A1 (de) Vorrichtung zur optimierung der kopplung zweier optischer systeme zur beobachtung und analyse von objekten
DE10161486B4 (de) Konfokaler Liniensensor
EP1901030A2 (fr) Agencement de mesure et procédé de détection de la surface d'objets
DE202019103527U1 (de) Optische Messvorrichtung mit konfokal-chromatischem, optischem Sensor
EP4010145B1 (fr) Procédé d'analyse de la surface d'une pièce dans le cadre d'un processus d'usinage laser et dispositif d'analyse destiné à analyser la surface d'une pièce
DE102017111819B4 (de) Bohrungsinspektionsvorrichtung

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): JP US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase