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Sensitivity and resolution response of optical flow-based background-oriented schlieren to speckle patterns

Cakir, Bora O. LU orcid ; Lavagnoli, Sergio ; Saracoglu, Bayindir H. and Fureby, Christer LU (2024) In Measurement Science and Technology 35(7).
Abstract

The degraded resolution and sensitivity characteristics of background-oriented schlieren (BOS) can be recovered by utilizing an optical flow (OF)-based image processing scheme. However, the background patterns conventionally employed in BOS setups suit the needs of the cross-correlation approach, whereas OF is based on a completely different mathematical background. Thus, in order to characterize the resolution and sensitivity response of OF-based BOS to the background generation configurations, a parametric study is performed. First, a synthetic assessment based on an analytical solution of a one-dimensional shock tube problem is conducted. Then, a numerical assessment utilizing direct numerical simulation data of density-driven... (More)

The degraded resolution and sensitivity characteristics of background-oriented schlieren (BOS) can be recovered by utilizing an optical flow (OF)-based image processing scheme. However, the background patterns conventionally employed in BOS setups suit the needs of the cross-correlation approach, whereas OF is based on a completely different mathematical background. Thus, in order to characterize the resolution and sensitivity response of OF-based BOS to the background generation configurations, a parametric study is performed. First, a synthetic assessment based on an analytical solution of a one-dimensional shock tube problem is conducted. Then, a numerical assessment utilizing direct numerical simulation data of density-driven turbulence is performed. Finally, the applicability of the documented conclusions in realistic scenarios is tested through an experimental assessment over a plume of a swirling heated jet.

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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
background-oriented schlieren, density-driven turbulence, heated air jet, optical flow, shock tube, speckle patterns
in
Measurement Science and Technology
volume
35
issue
7
article number
075201
publisher
IOP Publishing
external identifiers
  • scopus:85189326283
ISSN
0957-0233
DOI
10.1088/1361-6501/ad30bd
language
English
LU publication?
yes
id
9f32f1e4-6123-41a2-bba5-d7592b48f43e
date added to LUP
2024-04-24 13:02:28
date last changed
2025-04-04 14:42:44
@article{9f32f1e4-6123-41a2-bba5-d7592b48f43e,
  abstract     = {{<p>The degraded resolution and sensitivity characteristics of background-oriented schlieren (BOS) can be recovered by utilizing an optical flow (OF)-based image processing scheme. However, the background patterns conventionally employed in BOS setups suit the needs of the cross-correlation approach, whereas OF is based on a completely different mathematical background. Thus, in order to characterize the resolution and sensitivity response of OF-based BOS to the background generation configurations, a parametric study is performed. First, a synthetic assessment based on an analytical solution of a one-dimensional shock tube problem is conducted. Then, a numerical assessment utilizing direct numerical simulation data of density-driven turbulence is performed. Finally, the applicability of the documented conclusions in realistic scenarios is tested through an experimental assessment over a plume of a swirling heated jet.</p>}},
  author       = {{Cakir, Bora O. and Lavagnoli, Sergio and Saracoglu, Bayindir H. and Fureby, Christer}},
  issn         = {{0957-0233}},
  keywords     = {{background-oriented schlieren; density-driven turbulence; heated air jet; optical flow; shock tube; speckle patterns}},
  language     = {{eng}},
  number       = {{7}},
  publisher    = {{IOP Publishing}},
  series       = {{Measurement Science and Technology}},
  title        = {{Sensitivity and resolution response of optical flow-based background-oriented schlieren to speckle patterns}},
  url          = {{http://dx.doi.org/10.1088/1361-6501/ad30bd}},
  doi          = {{10.1088/1361-6501/ad30bd}},
  volume       = {{35}},
  year         = {{2024}},
}