Details
| Original language | English |
|---|---|
| Pages (from-to) | 241-249 |
| Number of pages | 9 |
| Journal | Experiments in fluids |
| Volume | 43 |
| Issue number | 2-3 |
| Publication status | Published - 10 Jul 2007 |
Abstract
Three-dimensional density information of a double free air jet was acquired using optical tomography. The projections of the density field were measured using the background oriented schlieren method (BOS). Preceding the free jet measurements, the sensitivity, accuracy and resolution of the BOS method were investigated. The sensitivity depends mostly on the focal length of the lens used, the relative position of the object between camera and background and the smallest detectable shift in the image plane. The accuracy was found to be sufficiently high to apply a tomographic reconstruction process. The resolution is determined by the transfer function of the BOS-method. It is not constant and depends on the size of the interrogation windows used for the cross-correlation-algorithm. The reconstruction of the free jet was computed, using filtered back projection. The reconstructed 3D density field shows with good resolution the typical diamond structure of the density distribution in under-expanded free jets.
ASJC Scopus subject areas
- Engineering(all)
- Computational Mechanics
- Engineering(all)
- Mechanics of Materials
- Physics and Astronomy(all)
- Chemical Engineering(all)
- Fluid Flow and Transfer Processes
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In: Experiments in fluids, Vol. 43, No. 2-3, 10.07.2007, p. 241-249.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - The background oriented schlieren technique
T2 - Sensitivity, accuracy, resolution and application to a three-dimensional density field
AU - Goldhahn, Erik
AU - Seume, Jörg
PY - 2007/7/10
Y1 - 2007/7/10
N2 - Three-dimensional density information of a double free air jet was acquired using optical tomography. The projections of the density field were measured using the background oriented schlieren method (BOS). Preceding the free jet measurements, the sensitivity, accuracy and resolution of the BOS method were investigated. The sensitivity depends mostly on the focal length of the lens used, the relative position of the object between camera and background and the smallest detectable shift in the image plane. The accuracy was found to be sufficiently high to apply a tomographic reconstruction process. The resolution is determined by the transfer function of the BOS-method. It is not constant and depends on the size of the interrogation windows used for the cross-correlation-algorithm. The reconstruction of the free jet was computed, using filtered back projection. The reconstructed 3D density field shows with good resolution the typical diamond structure of the density distribution in under-expanded free jets.
AB - Three-dimensional density information of a double free air jet was acquired using optical tomography. The projections of the density field were measured using the background oriented schlieren method (BOS). Preceding the free jet measurements, the sensitivity, accuracy and resolution of the BOS method were investigated. The sensitivity depends mostly on the focal length of the lens used, the relative position of the object between camera and background and the smallest detectable shift in the image plane. The accuracy was found to be sufficiently high to apply a tomographic reconstruction process. The resolution is determined by the transfer function of the BOS-method. It is not constant and depends on the size of the interrogation windows used for the cross-correlation-algorithm. The reconstruction of the free jet was computed, using filtered back projection. The reconstructed 3D density field shows with good resolution the typical diamond structure of the density distribution in under-expanded free jets.
UR - http://www.scopus.com/inward/record.url?scp=34548074483&partnerID=8YFLogxK
U2 - 10.1007/s00348-007-0331-1
DO - 10.1007/s00348-007-0331-1
M3 - Article
AN - SCOPUS:34548074483
VL - 43
SP - 241
EP - 249
JO - Experiments in fluids
JF - Experiments in fluids
SN - 0723-4864
IS - 2-3
ER -