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Proceedings Paper

Holographic interferometry with additional shadowgraph visualization
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Paper Abstract

This paper describes the development of an optical system that can simultaneously generate an interferogram and a shadowgraph of a refractive index field (in this case, a compressible fluid flow). Such a combination allows one to record both the density and its second derivative OF THE SAME OBJECT AT THE SAME TIME. This can be achieved by splitting the object beam of a holographic interferometer before superimposing it with the reference beam. One half of this beam forms the hologram together with the reference beam, while the other is led into an imaging unit that generates an image of a plane that is located either before or behind the test object (the so-called shadow plane). This arrangement allows one to generate simultaneously two pictures, which provide more reliable quantitative and qualitative data about the investigated flow than each of the visualizations alone.

Paper Details

Date Published: 8 May 2001
PDF: 6 pages
Proc. SPIE 4416, Optical Engineering for Sensing and Nanotechnology (ICOSN 2001), (8 May 2001); doi: 10.1117/12.427057
Show Author Affiliations
Harald Kleine, Tohoku Univ. (Japan)
Kazuyoshi Takayama, Tohoku Univ. (Japan)


Published in SPIE Proceedings Vol. 4416:
Optical Engineering for Sensing and Nanotechnology (ICOSN 2001)
Koichi Iwata, Editor(s)

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