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Proceedings Paper

Laser Doppler velocimetry: in-vitro and in-vivo measurements of biological fluid flows in restricted volumes
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Paper Abstract

Laser Doppler velocimetry is an interferometric technique which allows to provide rapid. objective and non-invasive measurements of the flow velocities. The accuracy of these measurements depends on the apparatus function of the velocimeter which is the apparatus broadening of the Doppler spectrum. This is defined by the parameters of the optical and signal processing units of the velocimeter alone. In the majority of technical applications the probe volume of the conventional velocimeters is much smaller in extent than the dimensions characterizing the flow system under study. On the contrary the flows of biological fluids (protoplasm, blood, etc. ) are usually spacially restricted, so that the probe volume can be comparable to the characteristic dimension, e. g. the diameter, of the vessel . In these conditions the velocity gradients introduce the additional gradient broadening to the Doppler spectra which can exceed the apparatus broadening. This reduces the possibilities of the velocimeter to measure the velocity profiles in the investigated flows which are sometimes the main objectives of the study. But at the same time the gradient broadening carries the information on the velocity gradients which in certain cases can be extracted.

Paper Details

Date Published: 1 January 1992
PDF: 13 pages
Proc. SPIE 1553, Laser Interferometry IV: Computer-Aided Interferometry, (1 January 1992); doi: 10.1117/12.135335
Show Author Affiliations
Alexander V. Priezzhev, Moscow State Univ. (Russia)
Sergei G. Proskurin, Moscow State Univ. (Russia)

Published in SPIE Proceedings Vol. 1553:
Laser Interferometry IV: Computer-Aided Interferometry
Ryszard J. Pryputniewicz, Editor(s)

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