Background Oriented Schlieren (BOS) measurement in supersonic flow with 4K high-speed camera

M. Ota; K. Kurihara; H. Arimoto; K. Shida; T. Inage

doi:10.1117/12.2271019

20 February 2017 Background Oriented Schlieren (BOS) measurement in supersonic flow with 4K high-speed camera

M. Ota, K. Kurihara, H. Arimoto, K. Shida, T. Inage

Proceedings Volume 10328, Selected Papers from the 31st International Congress on High-Speed Imaging and Photonics; 103281E (2017) https://doi.org/10.1117/12.2271019
Event: 31st International Congress on High-Speed Imaging and Photonics, 2016, Osaka, Japan

Abstract

The Background Oriented Schlieren (BOS) technique is one of the novel measurement techniques and its application range is very wide. The principle of BOS is similar to that of the conventional schlieren technique, it exploits the bending of light ray caused by a refractive-index change corresponding to the density change in the medium. The BOS technique allows the quantitative measurement of density with very simple experimental setup and proper image analysis. Only a background and a digital camera are required for the experiment, so that even the real scale experiments can be realized. In recent years, the development of the high-speed camera is remarkable and so many high-speed phenomena can now be captured. To realize the precise measurement with BOS technique using high-speed camera, higher resolution (larger number of pixels) is desirable.

In this paper, with a technical support from Nobby Tech Ltd., a 4K high-speed camera (4096 × 2160 pixels) is applied to the BOS measurement of the lateral jet/cross flow interaction filed in the supersonic wind tunnel test as a trial of the quantitative density measurement with higher resolution. The measurement system consists of a 4K high-speed camera and a pulsed laser for background illumination. A telecentric optical system is also employed to improve the spatial resolution of the measurement. The measurement results of BOS technique up to 1000 fps with higher resolution are discussed.

Citation Download Citation

M. Ota, K. Kurihara, H. Arimoto, K. Shida, and T. Inage "Background Oriented Schlieren (BOS) measurement in supersonic flow with 4K high-speed camera", Proc. SPIE 10328, Selected Papers from the 31st International Congress on High-Speed Imaging and Photonics, 103281E (20 February 2017); https://doi.org/10.1117/12.2271019

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KEYWORDS

High speed cameras

Cameras

Image resolution

Refractive index

Digital cameras

Image analysis

Mirrors

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