EP2726858A1 - Projection dynamique de résultats pour un objet d'essai en mouvement - Google Patents

Projection dynamique de résultats pour un objet d'essai en mouvement

Info

Publication number
EP2726858A1
EP2726858A1 EP12812538.2A EP12812538A EP2726858A1 EP 2726858 A1 EP2726858 A1 EP 2726858A1 EP 12812538 A EP12812538 A EP 12812538A EP 2726858 A1 EP2726858 A1 EP 2726858A1
Authority
EP
European Patent Office
Prior art keywords
test object
test
arrangement according
thermography
detection means
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Withdrawn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
EP12812538.2A
Other languages
German (de)
English (en)
Inventor
Lukasz Adam BIENKOWSKI
Christian Homma
Hubert Mooshofer
Max Rothenfusser
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP2726858A1 publication Critical patent/EP2726858A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/30—Transforming light or analogous information into electric information
    • H04N5/33—Transforming infrared radiation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/72—Investigating presence of flaws
    • 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
    • G01N21/9515—Objects of complex shape, e.g. examined with use of a surface follower device
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/20—Analysis of motion
    • G06T7/292—Multi-camera tracking
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/70—Determining position or orientation of objects or cameras
    • G06T7/73—Determining position or orientation of objects or cameras using feature-based methods
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/20—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from infrared radiation only
    • H04N23/23—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from infrared radiation only from thermal infrared radiation

Definitions

  • the present invention relates to an arrangement and a method for evaluating a moving test object by means of active thermography.
  • thermography An extension of the so-called active thermography is known in which both a projection of thermographic data on a test specimen and an interaction with the projected thermographic data can be carried out.
  • An evaluation of results in this extension does not take place as usual in active thermography on the computer screen, but simplifies directly on the DUT.
  • a test object remains fixed so that a position of a projection image and a test piece match.
  • a change in position of a test object, for example, to improve viewing conditions, is therefore not possible.
  • This problem is a limitation in the evaluation process. It is merely a stationary-case projection technique, that is, an immovable test piece.
  • Conventional known methods already allow a direct evaluation on the test object. The assessment of defects on the screen and their manual transmission to the test object are therefore no longer necessary.
  • test object Since the test object must be clamped in the measuring device during the entire evaluation process and thus remain immobile, the test person can be disturbed by this measuring device and limited in space. Not infrequently, the clamped test object is not freely accessible, so that an evaluation of results is much more difficult.
  • the object of the invention is to provide an arrangement or a method with which a thermographic test pattern is likewise provided on a moving test object becomes.
  • a localization of anomalies should be executable on a moving real test object. It should be possible to move a test piece during a projection to improve an evaluation process.
  • an arrangement for an evaluation of a moving test object by means of active thermography, the arrangement comprising the following devices: a first detection device for detecting a thermographic test image of the test object; a second detection device for detecting three-dimensional surface coordinates of the test object; a computer device for adapting the thermography test image based on the three-dimensional surface data of the test object to the test object; a third detection device for detecting a respective position of the strigobj ectes in the three-dimensional
  • thermographic test image for adapting the thermographic test image with regard to its perspective and its position on the basis of the respective detected position of the test object; a projection unit for congruent projection of the thermographic test pattern adapted to the moving test object onto the test object.
  • a method for evaluating a moving test object by means of active thermography is provided with the following steps: a detection of a thermographic test image of the test object is carried out by means of a first detection device; by means of a second detection device, detection of three-dimensional surface coordinates of the test object is carried out; By means of a computer device, an adaptation of the thermographic test image is carried out on the basis of the three-dimensional surface data of the test object to the test object; By means of a third detection device, a detection of a jewei- ligent position of the test object in three-dimensional space; By means of the computer device, an adaptation of the thermographic test image with regard to its perspective and its position is carried out on the basis of the respective position of the test object; By means of a projection unit, a congruent projecting of the thermographic test pattern adapted to the moving test object is carried out on the test object.
  • the position of a test object can be determined.
  • the projection image is adapted by appropriate perspective correction and positioning in such a way that it adjusts congruently to the specimen in the case of subsequent projection, for example by means of a beamer.
  • the present invention allows the examiner free placement and movement of a scholarobj ectes, so that, for example, more favorable lighting conditions or an advantageous angle for the evaluation can be effected.
  • a resulting complete decoupling of the test object from the measuring arrangement results in an unlimited freedom of vision on and around the test object. In this way, the quality of an evaluation is effectively increased.
  • the third detection device may comprise an infrared camera or a depth sensor camera. In this way, the third detection device can be easily integrated into the first or second detection device.
  • the third detection device can have a cage in which the test object is fixed relative to markings of the cage is, and capture the respective positions of the markers. The position determination is simplified.
  • the third detection device on the test object fixed identification marks for example, so-called 2D Data Matrix Codes have.
  • the third detection device can in particular be a conventional camera.
  • the third detection device may have a robot arm having markings or sensors, on which the test object is fixed, and detect the respective positions of the markings or sensors.
  • the third detection device may have a position and orientation sensor fixed on the test object and detect its respective position data.
  • the third detection device may comprise two depth sensor cameras, of which the first detects a change in position and the second detects a new position.
  • the computer device can adapt the thermography test image as a function of a respective position of the test object by means of a mathematical 3D transformation.
  • the second detection device can also detect the three-dimensional surface coordinates by means of the depth sensor camera.
  • a depth sensor camera can detect three-dimensional surface coordinates of the test object, in particular by means of strip light projection or laser cutting.
  • a depth sensor camera can also detect a position of a test object.
  • the second detection device can detect the three-dimensional surface coordinates by means of distance measurements.
  • the projection unit can be a beamer.
  • the cage can additionally have control elements for switching functions.
  • a function may be a contrast adjustment, a change of a color pallet, a switching between views of a test result or a deep scrolling.
  • all method steps for detecting each change in a position of the test object can be repeated continuously.
  • the test object can be moved manually in three-dimensional space.
  • the third detection device can provide by means of a first depth sensor camera for detecting a position change and a second depth sensor camera for detecting an end position of a test object from a plurality of test objects last arranged on a test table.
  • FIG. 1 shows a first exemplary embodiment of an arrangement according to the invention
  • Figure 2 shows a second embodiment of an inventive arrangement
  • Figure 3 shows a third embodiment of an inventive arrangement
  • FIG. 4 shows a fourth exemplary embodiment of an arrangement according to the invention
  • Figure 5 shows an embodiment of an inventive
  • FIG. 1 shows a first exemplary embodiment of an arrangement according to the invention.
  • This arrangement for evaluating a moving test object 1 by means of active thermography has a first detection device 3 for detecting a thermography test image 5 of the test object 1.
  • a first detection device 3 is particularly advantageous a thermal imaging camera.
  • the arrangement additionally has a second detection device 7 for detecting three-dimensional surface coordinates of the test object 1.
  • Such a second detection unit 7 is particularly advantageously designed as a depth sensor camera.
  • a computer device 9 performs an adaptation of the thermography test image 5 on the basis of the three-dimensional surface data of the test object 1 to the test object 1.
  • a third detection device 15 a respective position of the test object 1 in three-dimensional space is additionally detected.
  • Such a third detection device 15 is particularly advantageously provided by the first detection device 3 or the second detection device 7.
  • the computer device 9 can now adapt the thermography test image 5 with respect to its perspective and its position, so that a projection unit 13 can congruently project the thermographic test image 5 matched to the moving test object 1 onto the Test object 1 can project congruently.
  • An arrangement according to the invention tion has according to this embodiment, a thermal imaging camera, a depth sensor camera and a projector. By means of the depth sensor camera, a 3D data record of a test part can be detected. The thermal image is adjusted on the basis of the 3D data set on a computer to the test object and its position by a mathematical 3D transformation.
  • a test object 1 is held in one hand during evaluation.
  • the test object 1, which may also be referred to as a test object, may for example be a turbine blade which can be held by a test person during the evaluation in his hand and moved freely in space.
  • the depth sensor camera continuously records the 3D data record of the test object, which determines the position of the test part in the room.
  • the transformed and adapted measurement result image is projected onto the test piece.
  • the position of the test object 1 can be determined by means of a position and orientation sensor, which is attached to the test object 1 and provides position information, for example by means of radio.
  • the test object 1 can be moved freely in space by the test person, whereby a transformed and adapted test result image can again be simply projected onto the test object 1.
  • markers that can be imaged with a conventional camera e.g. Data Matrix codes on which test object 1 is mounted in order to be able to follow it in the room.
  • FIG. 2 shows a second exemplary embodiment of an arrangement according to the invention.
  • the arrangement according to FIG. 2 corresponds to the arrangement according to FIG. 1, with the difference that the test object 1 is fastened in a cage K in order to simplify the determination of the position of the test object 1 and to reduce the computational effort of the computer device 9 and only with this can be moved.
  • the position of the test object 1 in the cage K remains unchanged during the evaluation.
  • At the cage corners KE are markers whose positions are detected by a depth sensor camera 7. From this, the position of the test object 1 can be calculated in a simplified manner.
  • the cage K has handles G, whereby rotating these cage handles allows various functions to be switched, such as contrast adjustment, changing a color palette, switching between different views of a test result or deep scrolling. Deep scrolling largely corresponds to a so-called zooming.
  • FIG. 3 shows a third exemplary embodiment of an arrangement according to the invention.
  • the test object 1 is held on a robot arm RA.
  • the robot arm RA can be moved freely in space with only small force. This is an advantage in investigations of heavy test objects 1, which would otherwise quickly lead to fatigue of the test person.
  • a determination of the position in space is effected by means of markers on the robot arm, which can be detected by means of the depth sensor camera 7, or / and by means of information from robotic sensors.
  • FIG. 4 shows a fourth exemplary embodiment of an arrangement according to the invention.
  • the test object 1 is placed on a test bench PT after a measurement.
  • two depth sensor cameras 7 and 7a are used.
  • a relatively accurate first depth sensor camera 7, which can also work in the visible light spectrum, as well as a relatively coarse low-cost depth sensor camera 7a.
  • the relatively accurate depth sensor camera 7 is used for the position detection.
  • Each position change is in turn detected by the relatively inaccurate depth sensor camera 7a, which continuously the strig mechanice 1 or the Test object 1 monitored in the invisible light spectrum.
  • the relatively accurate depth sensor camera 7 switches to determine the new position relatively accurately and adjust the projection.
  • Several test objects 1 can be located and evaluated simultaneously on the test bench PT.
  • FIG. 5 shows an exemplary embodiment of a method according to the invention.
  • a method for evaluating a moving test object 1 by means of active thermography can particularly advantageously comprise the following steps: With a step S1, a thermography test image of the test object is detected by means of a first detection device. With a second step S2, three-dimensional surface coordinates of the test object and respective positions of the test object in three-dimensional space are detected by means of a second detection device. With a third step S3, the thermographic test image data are adjusted by means of a computer device on the basis of the three-dimensional surface data and the position data of the test object.
  • thermographic test image adapted to the moving test object onto the test object is carried out by means of a projection unit.
  • Such an evaluation process can be carried out particularly advantageously continuously, so that an error-free projection is always ensured after a change in the position of the test object.

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  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Multimedia (AREA)
  • Immunology (AREA)
  • General Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • Analytical Chemistry (AREA)
  • Pathology (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Theoretical Computer Science (AREA)
  • Signal Processing (AREA)
  • Toxicology (AREA)
  • Radiation Pyrometers (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

La présente invention concerne un agencement et un procédé pour évaluer un objet d'essai (1) en mouvement par thermographie active. De plus, un troisième dispositif de détection (15) permet de déterminer une position respective d'un objet d'essai (1) dans l'espace 3D, et une image d'essai thermographique (5) est adaptée à l'objet d'essai (1) en termes de perspectives et de position aux fins de projection congruente.
EP12812538.2A 2011-12-16 2012-12-03 Projection dynamique de résultats pour un objet d'essai en mouvement Withdrawn EP2726858A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011088837 2011-12-16
PCT/EP2012/074196 WO2013087433A1 (fr) 2011-12-16 2012-12-03 Projection dynamique de résultats pour un objet d'essai en mouvement

Publications (1)

Publication Number Publication Date
EP2726858A1 true EP2726858A1 (fr) 2014-05-07

Family

ID=47520894

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12812538.2A Withdrawn EP2726858A1 (fr) 2011-12-16 2012-12-03 Projection dynamique de résultats pour un objet d'essai en mouvement

Country Status (3)

Country Link
US (1) US20140313324A1 (fr)
EP (1) EP2726858A1 (fr)
WO (1) WO2013087433A1 (fr)

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JP6304880B2 (ja) * 2014-06-17 2018-04-04 株式会社Ihi 非破壊検査装置
US11176286B2 (en) 2015-09-09 2021-11-16 Xerox Corporation System and method for internal structural defect analysis using three-dimensional sensor data
US9872011B2 (en) * 2015-11-24 2018-01-16 Nokia Technologies Oy High-speed depth sensing with a hybrid camera setup
CA3029111A1 (fr) * 2016-07-08 2018-01-11 Macdonald, Dettwiler And Associates Inc. Systeme et procede de distribution de fluides visqueux automatisee guidee par vision artificielle, destines a des operations de calfatage et d'etancheification

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US6470207B1 (en) * 1999-03-23 2002-10-22 Surgical Navigation Technologies, Inc. Navigational guidance via computer-assisted fluoroscopic imaging
JP4914019B2 (ja) * 2005-04-06 2012-04-11 キヤノン株式会社 位置姿勢計測方法及び装置
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CA2691595C (fr) * 2007-06-25 2017-08-22 Real Imaging Ltd. Methode, dispositif et systeme d'analyse d'images
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DE102010007449B4 (de) * 2010-02-10 2013-02-28 Siemens Aktiengesellschaft Anordnung und Verfahren zur Bewertung eines Prüfobjektes mittels aktiver Thermographie
KR101711061B1 (ko) * 2010-02-12 2017-02-28 삼성전자주식회사 깊이 추정 장치를 이용한 깊이 정보 추정 방법
JP5087101B2 (ja) * 2010-03-31 2012-11-28 株式会社バンダイナムコゲームス プログラム、情報記憶媒体及び画像生成システム
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Also Published As

Publication number Publication date
US20140313324A1 (en) 2014-10-23
WO2013087433A1 (fr) 2013-06-20

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