NDLI: Investigation of visualization characteristics of the sharp focusing schlieren method

Content Provider	IEEE Xplore Digital Library
Author	Kashitani, M. Yamaguchi, Y.
Copyright Year	2005
Description	Author affiliation: Department of Aerospace Engineering, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, Kanagawa 239-8686, JAPAN (Kashitani, M.)
Abstract	The schlieren method is most often used in the high speed wind tunnel testing as the flow visualization technique around the airfoil models etc. It is well known that the schlieren system is unable to obtain the three dimensional information occurring at various locations along the optical path. A large field focusing schlieren system was improved to visualize the three dimensional density gradients by Leonard M. Weinstein. His system uses a fresnel field lens to increase the brightness of image compared to the previous focusing schlieren system. This system is a useful diagnosis tool to investigate complex three-dimensional flow fields. This system also uses the diffuser lens or sheet to obtain a uniform lighting for the plane at the test section. However it is well known that the diffuser lens or sheet causes the loss of a light intensity. Also, the focusing schlieren system has the source grid to achieve multiple light sources that constructed with closely spaced thin lines (shading plane). So the strong extended light source is necessary, and the decrease in a light intensity for the source grid is a serious problem. Therefore, a countermeasure should be prepared to achieve the higher brightness system. In the present study, we would like to discuss especially the countermeasure of the loss of brightness by using the diffuser lens or sheet. In the present system, we adopt the rod lighting system (combination a general extended light source with a Kaleidoscope) as the higher brightness and uniform extended light source.
Starting Page	9
Ending Page	16
File Size	2922719
Page Count	8
File Format	PDF
ISBN	0780390962
DOI	10.1109/ICIASF.2005.1569898
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-08-29
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Visualization Light sources Focusing Lenses Brightness High speed optical techniques Optical interferometry Optical refraction Wind speed Automotive components
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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