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Proceedings Paper

Fiber optic distributed velocity sensor for precision measurements in microscopic and macroscopic flows
Author(s): Lars Buettner; Juergen Czarske
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Paper Abstract

We report about a laser Doppler velocity profile sensor for precision measurements of microfluidic flows. The sensor measures the velocity and position of a tracer particle in the measurement volume, which consists of two superposed interference fringe systems of different wavelength, one with convergent, one with divergent interference fringes. This arrangement was achieved with a special combination of a diffractive and achromatic lenses. Due to fiber-optic beam delivery the sensor can be build compact and offers potential for miniaturization. A spatial resolution in the sub-micrometer range and an uncertainty of the velocity of about 10-4 could be achieved. The sensor offers potential for a variety of applications, like the investigation of shear flows or precise flow rate measurments.

Paper Details

Date Published: 14 February 2005
PDF: 11 pages
Proc. SPIE 5776, Eighth International Symposium on Laser Metrology, (14 February 2005); doi: 10.1117/12.611667
Show Author Affiliations
Lars Buettner, Laser Zentrum Hannover e.V. (Germany)
Juergen Czarske, Laser Zentrum Hannover e.V. (Germany)

Published in SPIE Proceedings Vol. 5776:
Eighth International Symposium on Laser Metrology
R. Rodriguez-Vera; F. Mendoza-Santoyo, Editor(s)

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