Details
| Originalsprache | Englisch |
|---|---|
| Aufsatznummer | 114107 |
| Seitenumfang | 13 |
| Fachzeitschrift | Optical Engineering |
| Jahrgang | 57 |
| Ausgabenummer | 11 |
| Frühes Online-Datum | 20 Nov. 2018 |
| Publikationsstatus | Veröffentlicht - Nov. 2018 |
Abstract
The optical inspection of wrought hot workpieces between subsequent forming steps of a multistage process chain can yield diverse advantages. Deficient components can be detected in an early forming stage. Moreover, the eliminated cooling economizes heating energy. The present workpiece temperature can be exploited in the following chain steps. Challenges arise due to the heat input into the air surrounding the workpiece, as triangulation techniques rely on homogeneous optical conditions. The effect of an inhomogeneous refractive index field (RIF) in air on a 3-D geometry measurement by optical triangulation is modeled exemplary by a virtual measurement of a hot cylinder. To our knowledge, this is the first simulation approach that fully considers both light deflection from the illumination unit to object and from object to camera. Simulated measurement results in a homogeneous and an inhomogeneous RIF are compared. The presented approach predicts measurement deviations in inhomogeneous optical media and can help to design actuated or computer-assisted compensation routines in order to reduce deflection effects when measuring hot objects.
ASJC Scopus Sachgebiete
- Physik und Astronomie (insg.)
- Atom- und Molekularphysik sowie Optik
- Ingenieurwesen (insg.)
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in: Optical Engineering, Jahrgang 57, Nr. 11, 114107, 11.2018.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Full simulation model for laser triangulation measurement in an inhomogeneous refractive index field
AU - Beermann, Rüdiger
AU - Quentin, Lorenz
AU - Stein, Gunnar
AU - Reithmeier, Eduard
AU - Kästner, Markus
N1 - Funding information: We want to thank the Deutsche Forschungsgemeinschaft (DFG) for funding subproject C5 “Multiscale Geometry Inspection of Joining Zones” as part of the Collaborative Research Centre (CRC) 1153 Process chain to produce hybrid high performance components by Tailored Forming.
PY - 2018/11
Y1 - 2018/11
N2 - The optical inspection of wrought hot workpieces between subsequent forming steps of a multistage process chain can yield diverse advantages. Deficient components can be detected in an early forming stage. Moreover, the eliminated cooling economizes heating energy. The present workpiece temperature can be exploited in the following chain steps. Challenges arise due to the heat input into the air surrounding the workpiece, as triangulation techniques rely on homogeneous optical conditions. The effect of an inhomogeneous refractive index field (RIF) in air on a 3-D geometry measurement by optical triangulation is modeled exemplary by a virtual measurement of a hot cylinder. To our knowledge, this is the first simulation approach that fully considers both light deflection from the illumination unit to object and from object to camera. Simulated measurement results in a homogeneous and an inhomogeneous RIF are compared. The presented approach predicts measurement deviations in inhomogeneous optical media and can help to design actuated or computer-assisted compensation routines in order to reduce deflection effects when measuring hot objects.
AB - The optical inspection of wrought hot workpieces between subsequent forming steps of a multistage process chain can yield diverse advantages. Deficient components can be detected in an early forming stage. Moreover, the eliminated cooling economizes heating energy. The present workpiece temperature can be exploited in the following chain steps. Challenges arise due to the heat input into the air surrounding the workpiece, as triangulation techniques rely on homogeneous optical conditions. The effect of an inhomogeneous refractive index field (RIF) in air on a 3-D geometry measurement by optical triangulation is modeled exemplary by a virtual measurement of a hot cylinder. To our knowledge, this is the first simulation approach that fully considers both light deflection from the illumination unit to object and from object to camera. Simulated measurement results in a homogeneous and an inhomogeneous RIF are compared. The presented approach predicts measurement deviations in inhomogeneous optical media and can help to design actuated or computer-assisted compensation routines in order to reduce deflection effects when measuring hot objects.
KW - Hot workpiece
KW - Hybrid component
KW - Inhomogeneous media
KW - Light deflection
KW - Light section method
KW - Refractive index
KW - Simulation
KW - Triangulation
UR - http://www.scopus.com/inward/record.url?scp=85057309578&partnerID=8YFLogxK
U2 - 10.1117/1.OE.57.11.114107
DO - 10.1117/1.OE.57.11.114107
M3 - Article
AN - SCOPUS:85057309578
VL - 57
JO - Optical Engineering
JF - Optical Engineering
SN - 0091-3286
IS - 11
M1 - 114107
ER -