2D refractive index field measurements in air in different pressure scenarios

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dc.identifier.uri http://dx.doi.org/10.15488/10249
dc.identifier.uri https://www.repo.uni-hannover.de/handle/123456789/10322
dc.contributor.author Beermann, Rüdiger
dc.contributor.author Quentin, Lorenz
dc.contributor.author Reithmeier, Eduard
dc.contributor.author Kästner, Markus
dc.date.accessioned 2020-12-08T15:27:03Z
dc.date.available 2020-12-08T15:27:03Z
dc.date.issued 2018
dc.identifier.citation Beermann, R.; Quentin, L.; Reithmeier, E.; Kästner, M.: 2D refractive index field measurements in air in different pressure scenarios. In: Proceedings of SPIE 10819 (2018), 108190E. DOI: https://doi.org/10.1117/12.2500315
dc.description.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. © 2018 SPIE. eng
dc.language.iso eng
dc.publisher Bellingham : SPIE
dc.relation.ispartofseries Proceedings of SPIE 10819 (2018)
dc.rights Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden. Dieser Beitrag ist aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
dc.subject 3D measurement eng
dc.subject Fringe projection eng
dc.subject Light deection eng
dc.subject Optical inhomogeneity eng
dc.subject Refractive index field eng
dc.subject Triangulation eng
dc.subject.ddc 620 | Ingenieurwissenschaften und Maschinenbau ger
dc.title 2D refractive index field measurements in air in different pressure scenarios eng
dc.type conferenceObject
dc.type article
dc.type Text
dc.relation.doi https://doi.org/10.1117/12.2500315
dc.bibliographicCitation.volume 10819
dc.bibliographicCitation.firstPage 108190E
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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