Dot tracking methodology for background-oriented schlieren (BOS)

Rajendran, Lalit K.; Bane, Sally P.  M.; Vlachos, Pavlos P.

doi:10.1007/s00348-019-2793-3

Dot tracking methodology for background-oriented schlieren (BOS)

Journal Article · Thu Oct 10 00:00:00 EDT 2019 · Experiments in Fluids

DOI:https://doi.org/10.1007/s00348-019-2793-3· OSTI ID:1598795

Rajendran, Lalit K. ^[1]; Bane, Sally P. M. ^[2]; Vlachos, Pavlos P. ^[3]

Purdue Univ., West Lafayette, IN (United States). School of Aeronautics and Astronautics; Purdue University, School of Aeronautics and Astronautics
Purdue Univ., West Lafayette, IN (United States). School of Aeronautics and Astronautics
Purdue Univ., West Lafayette, IN (United States). School of Mechanical Engineering

We propose here a dot tracking methodology for processing background-oriented schlieren (BOS) images. The technique improves the accuracy, precision and spatial resolution compared to conventional cross-correlation algorithms. Our methodology utilizes the prior information about the dot pattern such as the location, size and number of dots to provide near 100% yield even for high dot densities (20 dots/32 × 32 pixels) and is robust to image noise. Furthermore, we propose an improvement to the displacement estimation step in the tracking process, especially for noisy images, using a “correlation correction”, whereby we combine the spatial resolution benefit of the tracking method and the smoothing property of the correlation method to increase the dynamic range of the overall measurement process. We evaluate the performance of the method with synthetic BOS images of buoyancy-driven turbulence rendered using ray-tracing simulations, and experimental images of flow in the exit plane of a converging–diverging nozzle. The results show that the improved spatial resolution results in a better accuracy of the tracking method compared to correlation-based methods in regions with sharp displacement gradients, and the correlation correction step reduces the noise floor of the measurement, resulting in a fourfold improvement in the dynamic range.

View Accepted Manuscript (DOE)

Research Organization:: Purdue Univ., West Lafayette, IN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: SC0018156

OSTI ID:: 1598795

Alternate ID(s):: OSTI ID: 22916100

Journal Information:: Experiments in Fluids, Journal Name: Experiments in Fluids Journal Issue: 11 Vol. 60; ISSN 0723-4864

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Uncertainty Quantification in density estimation from Background Oriented Schlieren (BOS) measurements Rajendran, Lalit K.; Zhang, Jiacheng; Bhattacharya, Sayantan arXiv https://doi.org/10.48550/arxiv.1909.06643	text	January 2019

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