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Proceedings Paper

Quantitative measurement of colored-fringe background oriented schlieren based on three-step phase shifting
Author(s): Yingwei Zhu; Yang Song; Xiangju Qu; Zhenhua Li; Anzhi He
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Paper Abstract

Background Oriented Schlieren (BOS) technique can be applied for quantitative flow field diagnosis with simple experimental configurations. One of the crucial steps of BOS techniques is the extraction of image displacement vectors. The cross-correlation algorithm widely used in PIV techniques have been introduced to address the BOS extraction. However, the cross-correlation algorithm depends on interrogation windows, which usually results in low spatial resolving or unstable results. This paper proposes an improved BOS approach based on three step phase-shifting algorithm with the usage of a colored-fringe pattern as background. RGB coded carrier-fringe image is composed of three phase-shifted images. Displacement vectors are extracted by comparing the different phases between the corresponding points in three separated images. This technique avoids the problem of selecting the interrogation window. Only one image is required in this approach. An experimental setup on the measurement of hot air gun was carried out by use of our proposed method. The results demonstrate that this technique can be used for quantitative measurement in flow field.

Paper Details

Date Published: 6 November 2018
PDF: 10 pages
Proc. SPIE 10819, Optical Metrology and Inspection for Industrial Applications V, 108191N (6 November 2018); doi: 10.1117/12.2500908
Show Author Affiliations
Yingwei Zhu, Nanjing Univ. of Science and Technology (China)
Yang Song, Nanjing Univ. of Science and Technology (China)
Xiangju Qu, Nanjing Univ. of Science and Technology (China)
Zhenhua Li, Nanjing Univ. of Science and Technology (China)
Anzhi He, Nanjing Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 10819:
Optical Metrology and Inspection for Industrial Applications V
Sen Han; Toru Yoshizawa; Song Zhang, Editor(s)

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