Mechanical surface treatment to obtain optically cooperative surfaces vis-à-vis fringe projection

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Original languageEnglish
Title of host publicationReflection, Scattering, and Diffraction from Surfaces II
Publication statusPublished - 2 Sept 2010
EventReflection, Scattering, and Diffraction from Surfaces II - San Diego, CA, United States
Duration: 2 Aug 20104 Aug 2010

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7792
ISSN (Print)0277-786X

Abstract

Fringe projection techniques are widely used for geometry measurement of synchro rings inside a manufacturing chain, since a dense areal geometrical data set is needed to evaluate all the key features. Post-process machined parts exhibit optically incooperative surfaces towards triangulation techniques. Hence these parts can't be measured accurately using fringe projection systems. The optical incooperativity originates from the scattering characteristics of the surface. Polished surfaces exhibit a narrow angle of light refraction, whereas rough surfaces scatter the light over a hemisphere more homogenously. The angle range at which an incident light ray is scattered is the basis for a definition of optical cooperativity. The wider the range, the higher is the optical cooperativity of the surface. In order to produce optically cooperative surfaces of machined parts for the use of fringe projection measuring systems, we employ methods of surface treatment. One promising mechanical method under investigation to obtain optical cooperativity with technical surfaces is done by blasting the surface with fused alumina (EKF1000). The blasted surface leads to an increased roughness which can be controlled using the blast parameters, i.e. blast-pressure, blast-duration and the distance of the blaster to the part surface. In this paper the effects of different parameters of the blast-process on the surface roughness, the optical roughness and on the optical cooperativity vis-à-vis fringe projection techniques are examined. Optimal parameter settings result in a sub-micrometer change with respect to the object surface. Since the effects due to a variation of the parameters are dependant on the object material, we restrict our research to the case-hardening steel 1.7193 (16MnCrS5).

Keywords

    Fringe projection, Light scattering, Optical cooperativity, Optical metrology, Surface treatment

ASJC Scopus subject areas

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Mechanical surface treatment to obtain optically cooperative surfaces vis-à-vis fringe projection. / Abo-Namous, Omar; Kästner, Markus; Reithmeier, Eduard et al.
Reflection, Scattering, and Diffraction from Surfaces II. 2010. 77920V (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7792).

Research output: Chapter in book/report/conference proceedingConference contributionResearchpeer review

Abo-Namous, O, Kästner, M, Reithmeier, E, Nicolaus, M, Möhwald, K & Bach, FW 2010, Mechanical surface treatment to obtain optically cooperative surfaces vis-à-vis fringe projection. in Reflection, Scattering, and Diffraction from Surfaces II., 77920V, Proceedings of SPIE - The International Society for Optical Engineering, vol. 7792, Reflection, Scattering, and Diffraction from Surfaces II, San Diego, CA, United States, 2 Aug 2010. https://doi.org/10.1117/12.860647
Abo-Namous, O., Kästner, M., Reithmeier, E., Nicolaus, M., Möhwald, K., & Bach, F. W. (2010). Mechanical surface treatment to obtain optically cooperative surfaces vis-à-vis fringe projection. In Reflection, Scattering, and Diffraction from Surfaces II Article 77920V (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7792). https://doi.org/10.1117/12.860647
Abo-Namous O, Kästner M, Reithmeier E, Nicolaus M, Möhwald K, Bach FW. Mechanical surface treatment to obtain optically cooperative surfaces vis-à-vis fringe projection. In Reflection, Scattering, and Diffraction from Surfaces II. 2010. 77920V. (Proceedings of SPIE - The International Society for Optical Engineering). doi: 10.1117/12.860647
Abo-Namous, Omar ; Kästner, Markus ; Reithmeier, Eduard et al. / Mechanical surface treatment to obtain optically cooperative surfaces vis-à-vis fringe projection. Reflection, Scattering, and Diffraction from Surfaces II. 2010. (Proceedings of SPIE - The International Society for Optical Engineering).
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abstract = "Fringe projection techniques are widely used for geometry measurement of synchro rings inside a manufacturing chain, since a dense areal geometrical data set is needed to evaluate all the key features. Post-process machined parts exhibit optically incooperative surfaces towards triangulation techniques. Hence these parts can't be measured accurately using fringe projection systems. The optical incooperativity originates from the scattering characteristics of the surface. Polished surfaces exhibit a narrow angle of light refraction, whereas rough surfaces scatter the light over a hemisphere more homogenously. The angle range at which an incident light ray is scattered is the basis for a definition of optical cooperativity. The wider the range, the higher is the optical cooperativity of the surface. In order to produce optically cooperative surfaces of machined parts for the use of fringe projection measuring systems, we employ methods of surface treatment. One promising mechanical method under investigation to obtain optical cooperativity with technical surfaces is done by blasting the surface with fused alumina (EKF1000). The blasted surface leads to an increased roughness which can be controlled using the blast parameters, i.e. blast-pressure, blast-duration and the distance of the blaster to the part surface. In this paper the effects of different parameters of the blast-process on the surface roughness, the optical roughness and on the optical cooperativity vis-{\`a}-vis fringe projection techniques are examined. Optimal parameter settings result in a sub-micrometer change with respect to the object surface. Since the effects due to a variation of the parameters are dependant on the object material, we restrict our research to the case-hardening steel 1.7193 (16MnCrS5).",
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AU - Kästner, Markus

AU - Reithmeier, Eduard

AU - Nicolaus, Martin

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