scholarly journals Optical Flow for Flight and Wind Tunnel Background Oriented Schlieren Imaging

2017 ◽  
Author(s):  
Nathanial T. Smith ◽  
James T. Heineck ◽  
Edward T. Schairer
Keyword(s):  
Wind Tunnel ◽  
Optical Flow ◽  
Schlieren Imaging ◽  
Background Oriented Schlieren

An evaluation of optical flow algorithms for background oriented schlieren imaging

2008 ◽  
Vol 46 (3) ◽  
pp. 467-476 ◽  
Author(s):  
Bradley Atcheson ◽  
Wolfgang Heidrich ◽  
Ivo Ihrke
Keyword(s):  
Optical Flow ◽  
Schlieren Imaging ◽  
Background Oriented Schlieren

scholarly journals Hybrid Adaptive Wavelet-Based Optical Flow Algorithm for Background Oriented Schlieren (BOS) Experiments

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Xin-yu Zhang ◽  
Li-Ming Wang ◽  
Bin Liu ◽  
Yue Luo ◽  
Xing-cheng Han
Keyword(s):  
Flow Field ◽  
Optical Flow ◽  
Measurement Technology ◽  
Refractive Index Gradient ◽  
Adaptive Wavelet ◽  
Flow Algorithm ◽  
Current Algorithm ◽  
Index Gradient ◽  
Background Oriented Schlieren ◽  
Flow Field Measurement

Quantitative analysis of the flow field is an effective method to study hydrodynamics. As a flow field measurement technology, the Background Oriented Schlieren (BOS) is widely used. However, it is difficult to measure the complex transparent flow field (flow field with large refractive index gradient) using the BOS experiment. In order to overcome this difficulty and improve the accuracy of the BOS experiment, this paper presents a hybrid adaptive wavelet-based optical flow algorithm for the BOS. The current algorithm is a combination of the traditional optical flow algorithm and the wavelet-based optical flow algorithm. By adding the initial value constraints, the adaptive scale constraints, and the adaptive regularization constraints, the algorithm can effectively overcome the above-mentioned difficulty and also improve its accuracy. To further illustrate the feasibility of the proposed method, this paper uses the simulation data, the data of the DNS datasets, and the data of the BOS experiment to verify the performance of the algorithm. The experiment of comparing the proposed algorithm with the existing ones is carried out on the DNS datasets and the data of the BOS experiment. Finally, the proposed method is verified by a practical BOS experiment. The results show that the proposed algorithm can effectively improve the measurement accuracy of displacements.

scholarly journals Preparation of optical flow diagnostics technique at JAXA 750kW arc-heated wind tunnel

2009 ◽  
Vol 29-1 (1) ◽  
pp. 201-201
Author(s):  
Masahito MIZUNO ◽  
Hiroki TAKAYANAG ◽  
Keisuke FUJII ◽  
Kazuhisa FUJITA
Keyword(s):  
Wind Tunnel ◽  
Optical Flow ◽  
Flow Diagnostics

Preparations for Tomographic Background-Oriented Schlieren Measurements in the 11-by 11-Foot Transonic Wind Tunnel

2020 ◽  
Author(s):  
Joshua M. Weisberger ◽  
Brett F. Bathel ◽  
Stephen B. Jones ◽  
Mark R. Woike ◽  
Jonathon D. Ponder ◽  
...  
Keyword(s):  
Wind Tunnel ◽  
Background Oriented Schlieren ◽  
Transonic Wind Tunnel

Natural-background-oriented schlieren imaging

2009 ◽  
Vol 48 (1) ◽  
pp. 59-68 ◽  
Author(s):  
Michael John Hargather ◽  
Gary S. Settles
Keyword(s):  
Natural Background ◽  
Schlieren Imaging ◽  
Background Oriented Schlieren
Sign in / Sign up

Export Citation Format

Share Document