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Proceedings Paper

Speckle Photography Of Density Gradients In Gas Flows
Author(s): G. N. Blinkov; N. A. Fomin; J. Konefal; O. G. Penyazkov; G. Sliwinski
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Paper Abstract

Speckle methods are described to determine density gradient distributions in gas flows. The results are presented on speckle photography measurements of density gradient fields and temperatures in jets, flames, gas flows, both laminar and turbulent. Study deals with gas jets from conic nozzles used for laser treatment of materials in a gas medium, with different-configuration flames at natural-gas burning in a pumping volume as well as with gas flows directed into the submerged space in shock tubes and into the cavity part of mixing high-power lasers. The main optical schemes and experimental set-ups for obtaining specklegrams are used by the present authors and are given here. Specklegrams are recorded by double exposure when a diffuse scatterer is placed before and behind an investigated object. Use of the measured values of speckle shifts at laser scanning of a specklegram allows reconstructing local parameter distributions for different cross-sections of axisymmetric objects.

Paper Details

Date Published: 3 April 1989
PDF: 5 pages
Proc. SPIE 1121, Interferometry '89, (3 April 1989); doi: 10.1117/12.961323
Show Author Affiliations
G. N. Blinkov, BSSR Academy of Sciences (Russian Federation)
N. A. Fomin, BSSR Academy of Sciences (Russian Federation)
J. Konefal, Polish Academy of Sciences (Poland)
O. G. Penyazkov, BSSR Academy of Sciences (Russian Federation)
G. Sliwinski, Polish Academy of Sciences (Poland)

Published in SPIE Proceedings Vol. 1121:
Interferometry '89

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