Details
| Original language | English |
|---|---|
| Title of host publication | Reflection, Scattering, and Diffraction from Surfaces II |
| Publication status | Published - 2 Sept 2010 |
| Event | Reflection, Scattering, and Diffraction from Surfaces II - San Diego, CA, United States Duration: 2 Aug 2010 → 4 Aug 2010 |
Publication series
| Name | Proceedings of SPIE - The International Society for Optical Engineering |
|---|---|
| Volume | 7792 |
| 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
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Condensed Matter Physics
- Computer Science(all)
- Computer Science Applications
- Mathematics(all)
- Applied Mathematics
- Engineering(all)
- Electrical and Electronic Engineering
Cite this
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- Harvard
- Apa
- Vancouver
- BibTeX
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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 proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Mechanical surface treatment to obtain optically cooperative surfaces vis-à-vis fringe projection
AU - Abo-Namous, Omar
AU - Kästner, Markus
AU - Reithmeier, Eduard
AU - Nicolaus, Martin
AU - Möhwald, Kai
AU - Bach, Friedrich Wilhelm
PY - 2010/9/2
Y1 - 2010/9/2
N2 - 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).
AB - 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).
KW - Fringe projection
KW - Light scattering
KW - Optical cooperativity
KW - Optical metrology
KW - Surface treatment
UR - http://www.scopus.com/inward/record.url?scp=77958066152&partnerID=8YFLogxK
U2 - 10.1117/12.860647
DO - 10.1117/12.860647
M3 - Conference contribution
AN - SCOPUS:77958066152
SN - 9780819482884
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Reflection, Scattering, and Diffraction from Surfaces II
T2 - Reflection, Scattering, and Diffraction from Surfaces II
Y2 - 2 August 2010 through 4 August 2010
ER -