Compact color schlieren optical system

Buchele, D. R.; Griffin, DeVon W.

doi:10.1364/ao.32.004218

Cited by 10 publications

(4 citation statements)

References 8 publications

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“…The results contained in this paper were obtained with a system based on corrected spherical primary mirrors. 17 The present configuration provides a 100-mm field of view and is quite compact. The optical prescription is fairly complex, containing 28 surfaces in each of the transmitting and receiving sections.…”

Section: Source and Opticsmentioning

confidence: 97%

Quantitative rainbow schlieren deflectometry

Greenberg

Klimek

Buchele³

1995

Appl. Opt.

Self Cite

104

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In the rainbow schlieren apparatus, a continuously graded rainbow filter is placed in the back focal plane of the decollimating lens. Refractive-index gradients in the test section thus appear as gradations in hue rather than irradiance. A simple system is described wherein a conventional color CCD array and video digitizer are used to quantify accurately the color attributes of the resulting image, and hence the associated ray deflections. The present system providesva sensitivity comparable with that of conventional interferometry, while being simpler to implement and less sensitive to mechanical misalignment.

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Section: Source and Opticsmentioning

confidence: 97%

Quantitative rainbow schlieren deflectometry

Greenberg

Klimek

Buchele³

1995

Appl. Opt.

Self Cite

104

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“…This technique, pioneered by Meyer, 14 allows straightforward experimentally based determination of the near-wall Mach number distribution, where the latter is determined via the classical oblique shock equation, or its weak-disturbance asymptotic form, the simple Mach wave-Mach number relation. 15 The color schlieren imaging system uses a typical, Z-shaped arrangement 16,17 ; in the flow images shown below, the flow travels left to right and the vertical line on the right is the nozzle exit plane. The schlieren field of view is optimized to allow complete imaging of the nozzle flow.…”

Section: Experimental Apparatusmentioning

confidence: 99%

Millisecond-scale shock-train evolution in high-pressure ratio nozzles: Schlieren imaging and qualitative analysis of shock–boundary layer interaction

Keanini

Tkacik

Srivastava

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part G:

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The classical picture of shock evolution in nozzles holds that under over-expanded flow conditions, a single, nominally normal shock exists within the nozzle. Focusing on the highly dynamic flow produced during blow-down of an experimental, high-nozzle pressure ratio, planar nozzle, this article presents visual evidence that shock-trains – here, a pair of parallel, nominally normal shocks – dominate the rapidly evolving flow field. Three principal results are presented in this study. First, high-speed schlieren images of the evolving nozzle flow are reported. Second, a simple qualitative model of shock–boundary layer/recirculation zone interaction is proposed and used to explain observed millisecond-scale shock-train structure. Third, limited wall pressure measurements and schlieren images are combined to propose a second qualitative model of shock-train–boundary layer/recirculation zone evolution on the longer blow-down process time-scale. The results provide insight into millisecond-scale compressible flow dynamics within high-nozzle pressure ratios .

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“…However, the absolute sensitivity is proportional to the collection focal length, resulting in long-throw systems for gas-phase applications. Folded, compound systems have been designed to provide more compact systems [6]. Interferometric measurements have also been implemented.…”

Section: Species Density and Temperature Measurementsmentioning

confidence: 99%

Microgravity combustion diagnostics: the path to the International Space Station

Greenberg

Weiland

Wal

1999

Meas. Sci. Technol.

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The Combustion Integrated Rack component of the Fluids and Combustion Facility (FCF), a multi-user, on-orbit International Space Station facility for the study of fluid physics and combustion science, is currently under development. The envelope of measurement requirements for the baselined combustion science experiments is presented, with a description of the basic diagnostic capabilities provided by the facility. An overview of instrumentation development supporting the FCF and conducted under the microgravity combustion research programme at the NASA Glenn Research Center is provided. The resulting advanced diagnostics capabilities serve as potential upgrades to this experimental facility.

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Compact color schlieren optical system

Cited by 10 publications

References 8 publications

Quantitative rainbow schlieren deflectometry

Quantitative rainbow schlieren deflectometry

Millisecond-scale shock-train evolution in high-pressure ratio nozzles: Schlieren imaging and qualitative analysis of shock–boundary layer interaction

Microgravity combustion diagnostics: the path to the International Space Station

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