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Optical measurement of waviness on specular surfaces by Fringe Reflection Technique, FRT
KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Metrology and Optics.
KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Metrology and Optics.ORCID iD: 0000-0002-0105-4102
2012 (English)In: Proceedings of the 12th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2012, euspen , 2012, Vol. 1, 117-120 p.Conference paper, Published paper (Refereed)
Abstract [en]

The need for accurate measurements of long range low amplitude topographic structure of specular (glossy) surfaces has been increased in automotive and aircraft industries. Optical measurement techniques are the most successful techniques to measure different surface structures with high resolution and high accuracy and at high speed. However, for glossy, specular surfaces many commercial techniques based on surface scattering fail. Fringe Reflection Technique (FRT), mimicking the human observation process of specular surfaces, is then a robust and suitable solution for measuring these surfaces. In our research we are interested in measuring waviness in the micron range over cm long spatial wavelengths. The artefact investigated is a flat casted and painted composite surface. By using a simple and non-expensive FRT-setup, combined with image analysis algorithms high resolution data were obtained. The results match well with reference data obtained by a Coherix interferometer with height measures of some ten micrometers over waviness having a lateral structure of several cm.

Place, publisher, year, edition, pages
euspen , 2012. Vol. 1, 117-120 p.
Keyword [en]
Surface waviness, fringe reflection, precision, optical measurement, metrology
National Category
Other Mechanical Engineering
Research subject
SRA - Production
Identifiers
URN: urn:nbn:se:kth:diva-116501Scopus ID: 2-s2.0-84911384574ISBN: 9780956679000 (print)OAI: oai:DiVA.org:kth-116501DiVA: diva2:589950
Conference
12th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2012, Stockholm, Sweden, 4 June 2012 through 7 June 2012
Projects
PRICE
Funder
VINNOVAXPRES - Initiative for excellence in production research
Note

QC 20130522

Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2017-05-23Bibliographically approved
In thesis
1. Image analysis for precision metrology: Verifacition of micro machining systems and aerodynamic surfaces
Open this publication in new window or tab >>Image analysis for precision metrology: Verifacition of micro machining systems and aerodynamic surfaces
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. xiii, 85 p.
Series
TRITA-IIP, ISSN 1650-1888 ; 14:06
National Category
Other Engineering and Technologies not elsewhere specified
Identifiers
urn:nbn:se:kth:diva-146594 (URN)978-91-7595-199-7 (ISBN)
Presentation
2014-06-13, Sal M311, Brinellvägen 68, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20140612

Available from: 2014-06-12 Created: 2014-06-12 Last updated: 2014-06-12Bibliographically approved
2. Enhanced image analysis, a tool for precision metrology in the micro and macro world
Open this publication in new window or tab >>Enhanced image analysis, a tool for precision metrology in the micro and macro world
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The need for high speed and cost efficient inspection in manufacturing lineshas led to a vast usage of camera-based vision systems. The performance ofthese systems is sufficient to determine shape and size, but hardly to an accuracylevel comparable with traditional metrology tools. To achieve highprecision shape/position/defect measurements, the camera techniques haveto be combined with high performance image metrology techniques whichare developed and adapted to the manufactured components. The focus ofthis thesis is the application of enhanced image analysis as a tool for highprecision metrology. Dedicated algorithms have been developed, tested andevaluated in three practical cases ranging from micro manufacturing at submicronprecision to meter sized aerospace components with precision requirementsin the 10 μm range.The latter measurement challenge was solved by low cost standard consumerproducts, i.e. digital cameras in a stereo configuration and structured lightfrom a gobo-projector. Combined with high-precision image analysis and anew approach in camera calibration and 3D reconstruction for precise 3Dshape measurement of meter sized surfaces, the achievement was fulfilledand verified by two conventional measurement systems; a high precisioncoordinate measurement machine and a laser scanner.The sub-micron challenge was the implementation of image metrology forverification of micro manufacturing installations within a joint Europeaninfrastructure network, EUMINAfab. The results were an unpleasant surprisefor some of the participating laboratories, but became a big step forwardto improve the dimensional accuracy of the investigated laser micromachining, micro milling and micro-printing systems, since the accuracy ofthese techniques are very difficult to assess.The third high precision metrology challenge was the measurement of longrange,low-amplitude topographic structures on specular (shiny) aerodynamicsurfaces. In this case Fringe Reflection Technique (FRT) was appliedand image analysis algorithms were used to evaluate the fringe deformationas a measure of the surface slopes to obtain high resolution data. The resultwas compared with an interferometric analysis showing height deviation inthe range of tens of micrometers over a lateral extension of several cm.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2017. 120 p.
Series
TRITA-IIP, ISSN 1650-1888 ; TRITA IIP-17-05
Keyword
Image processing, image metrology, precision metrology, image correlation, subpixel, accuracy, uncertainty
National Category
Engineering and Technology
Research subject
Production Engineering
Identifiers
urn:nbn:se:kth:diva-207594 (URN)978-91-7729-392-7 (ISBN)
Public defence
2017-06-15, M311, Brinellvägen 68, Stockholm, 10:00 (English)
Opponent
Supervisors
Projects
LOCOMACHSEUMINAfabCleansky
Note

QC 20170523

Available from: 2017-05-23 Created: 2017-05-22 Last updated: 2017-05-23Bibliographically approved

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  • apa
  • harvard1
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