Fiber optic distributed velocity sensor for precision measurements in microscopic and macroscopic flows

Lars Buettner; Juergen Czarske

doi:10.1117/12.611667

14 February 2005 Fiber optic distributed velocity sensor for precision measurements in microscopic and macroscopic flows

Lars Buettner, Juergen Czarske

Author Affiliations +

Proceedings Volume 5776, Eighth International Symposium on Laser Metrology; (2005) https://doi.org/10.1117/12.611667
Event: Eighth International Conference on Laser Metrology, 2005, Merida, Mexico

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.

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Lars Buettner and Juergen Czarske "Fiber optic distributed velocity sensor for precision measurements in microscopic and macroscopic flows", Proc. SPIE 5776, Eighth International Symposium on Laser Metrology, (14 February 2005); https://doi.org/10.1117/12.611667

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