Sensitivity and resolution response of optical flow-based background-oriented schlieren to speckle patterns
(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.
(Less)
- author
- Cakir, Bora O.
LU
; Lavagnoli, Sergio ; Saracoglu, Bayindir H. and Fureby, Christer LU
- organization
- publishing date
- 2024-07
- 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
- 2024-04-24 13:03:02
@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}}, }