Details
| Originalsprache | Englisch |
|---|---|
| Titel des Sammelwerks | Optical Metrology and Inspection for Industrial Applications V |
| Herausgeber/-innen | Toru Yoshizawa, Song Zhang, Sen Han, Sen Han |
| Herausgeber (Verlag) | SPIE |
| Seitenumfang | 8 |
| ISBN (elektronisch) | 9781510622364 |
| Publikationsstatus | Veröffentlicht - 2 Nov. 2018 |
| Veranstaltung | Optical Metrology and Inspection for Industrial Applications V 2018 - Beijing, China Dauer: 11 Okt. 2018 → 13 Okt. 2018 |
Publikationsreihe
| Name | Proceedings of SPIE - The International Society for Optical Engineering |
|---|---|
| Band | 10819 |
| ISSN (Print) | 0277-786X |
| ISSN (elektronisch) | 1996-756X |
Abstract
The optical geometry characterization of wrought hot components can help to quantify material distortion effects during air-cooling. The component's shrinkage behavior is affected by inhomogeneous heat dissipation due to the object's complex geometry and - in case of hybrid materials - differing thermal expansion coefficients. As optical triangulation techniques rely on the rectilinear expansion of light, the hot component's heat input into the surrounding medium air influences the reachable accuracy of optical geometry measurements due to an inhomogeneous refractive index field around the hot component. In previous work, the authors identified low pressure measurements in air as a possible approach to reduce the magnitude and expansion of the inhomogeneous refractive index field above cylindrical high-temperature objects and thereby allow precise geometry acquisition. We now present experimental data of the 2D refractive index field above a hot cylinder in different pressure scenarios using the well-known background oriented schlieren (BOS) method in order to illustrate the decrease in refractive index variations dependent on the pressure state. For this purpose, a ceramic rod is placed in a vacuum chamber and heated up to temperatures of about 1000°C. Using a monochromatic camera, a wavelet background and an optical ow algorithm, the developing 2D refractive index field for a low pressure scenario is compared to ambient pressure conditions. The experimental data illustrates a reduction in the convective heat flow above the hot heating rod at lower pressure values and therefore a homogenization of the density-coupled refractive index in air, validating former simulation results.
ASJC Scopus Sachgebiete
- Werkstoffwissenschaften (insg.)
- Elektronische, optische und magnetische Materialien
- Physik und Astronomie (insg.)
- Physik der kondensierten Materie
- Informatik (insg.)
- Angewandte Informatik
- Mathematik (insg.)
- Angewandte Mathematik
- Ingenieurwesen (insg.)
- Elektrotechnik und Elektronik
Zitieren
- Standard
- Harvard
- Apa
- Vancouver
- BibTex
- RIS
Optical Metrology and Inspection for Industrial Applications V. Hrsg. / Toru Yoshizawa; Song Zhang; Sen Han; Sen Han. SPIE, 2018. 108190E (Proceedings of SPIE - The International Society for Optical Engineering; Band 10819).
Publikation: Beitrag in Buch/Bericht/Sammelwerk/Konferenzband › Aufsatz in Konferenzband › Forschung › Peer-Review
}
TY - GEN
T1 - 2D refractive index field measurements in air in different pressure scenarios
AU - Beermann, Rüdiger
AU - Quentin, Lorenz
AU - Reithmeier, Eduard
AU - Kästner, Markus
N1 - Funding information: The results presented in this paper were obtained within the Collaborative Research Centre 1153 Process Chain for Manufacturing Hybrid High Performance Components by Tailored Forming in the subproject C5 Multiscale Geometry Inspection of Joining Zones. The authors would like to thank the German Research Foundation (DFG) for the financial and organisational support of this project.
PY - 2018/11/2
Y1 - 2018/11/2
N2 - The optical geometry characterization of wrought hot components can help to quantify material distortion effects during air-cooling. The component's shrinkage behavior is affected by inhomogeneous heat dissipation due to the object's complex geometry and - in case of hybrid materials - differing thermal expansion coefficients. As optical triangulation techniques rely on the rectilinear expansion of light, the hot component's heat input into the surrounding medium air influences the reachable accuracy of optical geometry measurements due to an inhomogeneous refractive index field around the hot component. In previous work, the authors identified low pressure measurements in air as a possible approach to reduce the magnitude and expansion of the inhomogeneous refractive index field above cylindrical high-temperature objects and thereby allow precise geometry acquisition. We now present experimental data of the 2D refractive index field above a hot cylinder in different pressure scenarios using the well-known background oriented schlieren (BOS) method in order to illustrate the decrease in refractive index variations dependent on the pressure state. For this purpose, a ceramic rod is placed in a vacuum chamber and heated up to temperatures of about 1000°C. Using a monochromatic camera, a wavelet background and an optical ow algorithm, the developing 2D refractive index field for a low pressure scenario is compared to ambient pressure conditions. The experimental data illustrates a reduction in the convective heat flow above the hot heating rod at lower pressure values and therefore a homogenization of the density-coupled refractive index in air, validating former simulation results.
AB - The optical geometry characterization of wrought hot components can help to quantify material distortion effects during air-cooling. The component's shrinkage behavior is affected by inhomogeneous heat dissipation due to the object's complex geometry and - in case of hybrid materials - differing thermal expansion coefficients. As optical triangulation techniques rely on the rectilinear expansion of light, the hot component's heat input into the surrounding medium air influences the reachable accuracy of optical geometry measurements due to an inhomogeneous refractive index field around the hot component. In previous work, the authors identified low pressure measurements in air as a possible approach to reduce the magnitude and expansion of the inhomogeneous refractive index field above cylindrical high-temperature objects and thereby allow precise geometry acquisition. We now present experimental data of the 2D refractive index field above a hot cylinder in different pressure scenarios using the well-known background oriented schlieren (BOS) method in order to illustrate the decrease in refractive index variations dependent on the pressure state. For this purpose, a ceramic rod is placed in a vacuum chamber and heated up to temperatures of about 1000°C. Using a monochromatic camera, a wavelet background and an optical ow algorithm, the developing 2D refractive index field for a low pressure scenario is compared to ambient pressure conditions. The experimental data illustrates a reduction in the convective heat flow above the hot heating rod at lower pressure values and therefore a homogenization of the density-coupled refractive index in air, validating former simulation results.
KW - 3D measurement
KW - Fringe projection
KW - Light deection
KW - Optical inhomogeneity
KW - Refractive index field
KW - Triangulation
UR - http://www.scopus.com/inward/record.url?scp=85059363986&partnerID=8YFLogxK
U2 - 10.1117/12.2500315
DO - 10.1117/12.2500315
M3 - Conference contribution
AN - SCOPUS:85059363986
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Optical Metrology and Inspection for Industrial Applications V
A2 - Yoshizawa, Toru
A2 - Zhang, Song
A2 - Han, Sen
A2 - Han, Sen
PB - SPIE
T2 - Optical Metrology and Inspection for Industrial Applications V 2018
Y2 - 11 October 2018 through 13 October 2018
ER -