WO2012098455A1 - Arrangement and method in measuring system - Google Patents

Arrangement and method in measuring system Download PDF

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Publication number
WO2012098455A1
WO2012098455A1 PCT/IB2012/000070 IB2012000070W WO2012098455A1 WO 2012098455 A1 WO2012098455 A1 WO 2012098455A1 IB 2012000070 W IB2012000070 W IB 2012000070W WO 2012098455 A1 WO2012098455 A1 WO 2012098455A1
Authority
WO
WIPO (PCT)
Prior art keywords
light source
image sensor
arrangement
accordingly
light
Prior art date
Application number
PCT/IB2012/000070
Other languages
French (fr)
Inventor
Tommi Ilkka DILLSTRÖM
Original Assignee
Visiometric Oü
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 Visiometric Oü filed Critical Visiometric Oü
Publication of WO2012098455A1 publication Critical patent/WO2012098455A1/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G01B11/25—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G01B11/25—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object
    • G01B11/2545—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object with one projection direction and several detection directions, e.g. stereo
    • 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
    • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
    • G01N21/892—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the flaw, defect or object feature examined
    • G01N21/898—Irregularities in textured or patterned surfaces, e.g. textiles, wood
    • G01N21/8986—Wood

Definitions

  • the present invention relates to a method and an arrangement for improving measuring quality, accuracy and reliability of line laser based scanners that are based on exact position and/or alignment of laser line.
  • the invention relates in particular to the field of mechanical forest industry and improves the work of 3D-scanner based on triangulation principle.
  • Light sources or laser scanners are used in wood processing to recognize lumber profiles (US 2007/0263918 A1 ) or measuring of the lumber objects (WO03042631 A1 ).
  • Figure 2 depicts side view of the arrangement accordingly to the invention.
  • Figure 1 shows a set-up accordingly to the invention with a camera 4, a light source 3, for example a laser line, an object 5 to be imaged and at least one image sensor 1 or 2.
  • the preferred embodiment has two image sensors 1 ,2 but optionally there can be more image sensors if required.
  • Image sensors 1 , 2 are arranged so that laser light from light source 3 goes directly into the image sensors 1 , 2.
  • Camera 4 makes the 3D measurement of the profile of the object 5.
  • the image sensors 1 , 2 are without lenses but optionally they can be equipped with lenses.
  • the image sensors 1 , 2 can have one (line scan sensor) or several lines (matrix sensor) of image.
  • the image sensors 1 , 2 are in an accurately fixed position so they can monitor the position of the light source 3.
  • the image sensors 1 , 2 have pixel size less than 1/10 mm making them very precise to detect even the slight displacement of the light beam.
  • the image sensors 1 , 2 also can detect the intensity and distribution of the light beam from the light source 3.
  • the image sensors 1 , 2 also can detect if the light source 3 needs maintenance or replacing or recalibrating before the quality of scanning deteriorates.
  • the exact position of the light source 3 can be determined if its light beam will be driven directly to the image sensors 1 , 2 which will facilitate the repositioning of the light source 3. It is likewise stated in the description that measurement is performed on a piece of timber.
  • the invention obviously works just as well in measuring the geometric profile of and/or the light dispersion in an object of some other shape or of a material other than wood. The invention must thereby be regarded as being limited only by the scope of the patent claims below.

Abstract

The present invention relates to a method and an arrangement for improving measuring quality, accuracy and reliability of line laser based scanners that are based on exact position and/or alignment of laser line. The invention relates in particular to the field of mechanical forest industry and improves the work of 3D-scanner based on triangulation principle. Image sensors are introduced and they are arranged so that laser light from light source goes directly into the sensors. The image sensors can detect the intensity and distribution of the light beam from the light source and can also detect if the light source needs maintenance or replacing or recalibrating before the quality of scanning deteriorates. The exact position of the light source can also be determined if its light beam will be driven directly to the image sensors which will facilitate the repositioning of the light source.

Description

ARRANGEMENT AND METHOD IN MEASURING SYSTEM
TECHNICAL FIELD
The present invention relates to a method and an arrangement for improving measuring quality, accuracy and reliability of line laser based scanners that are based on exact position and/or alignment of laser line. The invention relates in particular to the field of mechanical forest industry and improves the work of 3D-scanner based on triangulation principle.
PRIOR ART
Light sources or laser scanners are used in wood processing to recognize lumber profiles (US 2007/0263918 A1 ) or measuring of the lumber objects (WO03042631 A1 ).
Also known is the possibility of measuring the shape of an object, that is to say the cross-sectional geometric profile thereof, by illuminating it with a light source and detecting the position of the representation of the reflected light on a sensor, which observes the object from a given angle, so-called triangulation. This will be referred to hereinafter as profile measurement. Combining light dispersion measurement and profile measurement by illuminating the wood surface with more than one light source (SE501650 C2), one for light dispersion and one for profile measurement, in one image is likewise known. The problems with scanners and image sensors in mechanical forest industry are that dust and debris, vibration and mechanical impacts of wood pieces alter the measuring quality and accuracy of the scanners or sensors.
SUMMARY OF THE INVENTION
It is an object of the invention to provide improved arrangement for the measuring system, improving its quality, accuracy and reliability. - It is another object of the invention to provide improved method for the detection of the displacement of the light source, decrease of the effect of it and to facilitate accurate replacement of it.
BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 depicts general overview of the arrangement accordingly to the invention.
Figure 2 depicts side view of the arrangement accordingly to the invention.
DETAILED DESCRIPTION OF EMBODIMENTS
The invention will now be described in more detail with examples of embodiments and with reference to the figures attached. Figure 1 shows a set-up accordingly to the invention with a camera 4, a light source 3, for example a laser line, an object 5 to be imaged and at least one image sensor 1 or 2. The preferred embodiment has two image sensors 1 ,2 but optionally there can be more image sensors if required. Image sensors 1 , 2 are arranged so that laser light from light source 3 goes directly into the image sensors 1 , 2. Camera 4 makes the 3D measurement of the profile of the object 5.
Preferably the image sensors 1 , 2 are without lenses but optionally they can be equipped with lenses.
The image sensors 1 , 2 can have one (line scan sensor) or several lines (matrix sensor) of image. The image sensors 1 , 2 are in an accurately fixed position so they can monitor the position of the light source 3. The image sensors 1 , 2 have pixel size less than 1/10 mm making them very precise to detect even the slight displacement of the light beam.
The image sensors 1 , 2 also can detect the intensity and distribution of the light beam from the light source 3. The image sensors 1 , 2 also can detect if the light source 3 needs maintenance or replacing or recalibrating before the quality of scanning deteriorates. The exact position of the light source 3 can be determined if its light beam will be driven directly to the image sensors 1 , 2 which will facilitate the repositioning of the light source 3. It is likewise stated in the description that measurement is performed on a piece of timber. The invention obviously works just as well in measuring the geometric profile of and/or the light dispersion in an object of some other shape or of a material other than wood. The invention must thereby be regarded as being limited only by the scope of the patent claims below.

Claims

1. Arrangement in measuring system for imaging an object (5) by means of a measuring system comprising a camera (4) and a light source (3), characterised in that at least one image sensor (1 or 2) arranged in an accurately fixed position so that light from light source (3) goes directly into the image sensor (1 or 2) is provided.
2. Arrangement accordingly to claim 1 , characterised in that image sensor (1 or 2) is without lens.
3. Arrangement accordingly to claim 1 , characterised in that image sensor (1 or 2) is with lens.
4. Arrangement accordingly to any claims 1 to 3, characterised in that image sensor (1 or 2) has one line of image.
5. Arrangement accordingly to any claims 1 to 3, characterised in that image sensor (1 or 2) has several lines of image.
6. Arrangement accordingly to any claims 1 to 5, characterised in that image sensor (1 or 2) has pixel size less than 1/10 mm.
7. Arrangement accordingly to any of claims 1 to 6, characterised in that at least two image sensors (1 , 2) are provided.
8. Method in measuring system accordingly to arrangement in claims 1 -7, characterised in that image sensor (1 or 2) detects the intensity and distribution of the light beam from the light source (3).
9. Method accordingly to claim 8, characterised in that image sensor (1 or 2) detects if the light source (3) needs maintenance.
10. Method accordingly to claim 8, characterised in that image sensor (1 or 2) detects if the light source (3) needs replacing.
1 1. Method accordingly to claim 8, characterised in that image sensor (1 or 2) detects if the light source (3) needs recalibrating.
12. Method accordingly to claims 8-1 1 , characterised in that image sensor (1 or 2) determines the exact position of the light source (3) by driving the light beam from the light source (3) directly to the image sensor (1 or 2).
PCT/IB2012/000070 2011-01-20 2012-01-19 Arrangement and method in measuring system WO2012098455A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EEP201100004 2011-01-20
EEP201100004A EE05696B1 (en) 2011-01-20 2011-01-20 A technical solution and method for improving the performance of line-based scanners

Publications (1)

Publication Number Publication Date
WO2012098455A1 true WO2012098455A1 (en) 2012-07-26

Family

ID=45855965

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2012/000070 WO2012098455A1 (en) 2011-01-20 2012-01-19 Arrangement and method in measuring system

Country Status (2)

Country Link
EE (1) EE05696B1 (en)
WO (1) WO2012098455A1 (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE501650C2 (en) 1994-03-08 1995-04-03 Soliton Elektronik Ab Device and method for detecting defects in wood
WO2003042631A1 (en) 2001-10-02 2003-05-22 Ivp Integrated Vision Products Ab Method and arrangement in a measuring system
DE10208781A1 (en) * 2002-02-28 2003-09-18 Fraunhofer Ges Forschung Method for determining the intensity distribution when a laser beam is incident on an object surface whereby laser beam intensity distributions are measured along the beam path and an object shape is determined by interpolation
WO2006021442A1 (en) * 2004-08-26 2006-03-02 ARGES Gesellschaft für Industrieplanung und Lasertechnik m.b.H. Scan head as part of a laser drilling and cutting device
JP2007173782A (en) * 2005-11-23 2007-07-05 Semiconductor Energy Lab Co Ltd Laser irradiation device
US20070263918A1 (en) 2006-02-13 2007-11-15 David Jenya Method and system of recognizing profiles and defects in wood processing
DE102006048954A1 (en) * 2006-10-17 2008-04-24 Ba Messtechnik Gmbh Extruded profile cross section recording method for inline operation, involves recording diameter of extruded profile using shadow measuring method, and recording profile section of extruded profile using light-section method
WO2010146799A1 (en) * 2009-06-18 2010-12-23 株式会社日立ハイテクノロジーズ Defect inspection device and inspection method

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE501650C2 (en) 1994-03-08 1995-04-03 Soliton Elektronik Ab Device and method for detecting defects in wood
WO2003042631A1 (en) 2001-10-02 2003-05-22 Ivp Integrated Vision Products Ab Method and arrangement in a measuring system
DE10208781A1 (en) * 2002-02-28 2003-09-18 Fraunhofer Ges Forschung Method for determining the intensity distribution when a laser beam is incident on an object surface whereby laser beam intensity distributions are measured along the beam path and an object shape is determined by interpolation
WO2006021442A1 (en) * 2004-08-26 2006-03-02 ARGES Gesellschaft für Industrieplanung und Lasertechnik m.b.H. Scan head as part of a laser drilling and cutting device
JP2007173782A (en) * 2005-11-23 2007-07-05 Semiconductor Energy Lab Co Ltd Laser irradiation device
US20070263918A1 (en) 2006-02-13 2007-11-15 David Jenya Method and system of recognizing profiles and defects in wood processing
DE102006048954A1 (en) * 2006-10-17 2008-04-24 Ba Messtechnik Gmbh Extruded profile cross section recording method for inline operation, involves recording diameter of extruded profile using shadow measuring method, and recording profile section of extruded profile using light-section method
WO2010146799A1 (en) * 2009-06-18 2010-12-23 株式会社日立ハイテクノロジーズ Defect inspection device and inspection method

Also Published As

Publication number Publication date
EE201100004A (en) 2012-10-15
EE05696B1 (en) 2013-12-16

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