New differential laser microanemometer

B. Reuter; N. Talukder

doi:10.1117/12.959015

15 May 1981 New differential laser microanemometer

B. Reuter, N. Talukder

Proceedings Volume 0236, 1980 European Conf on Optical Systems and Applications; (1981) https://doi.org/10.1117/12.959015
Event: 1980 European Conference on Optical Systems and Applications, 1980, Utrecht, Netherlands

Abstract

A laser microanemometer has been developed for contactless measurement of flow velocity distributions in the immediate vicinity of vessel walls. This new anemometer is basically a microscope using incident coherent light and spatial frequency plane filtering for noise suppression. Velocities of submicroscopic particles suspended in the fluid and backscattering the laser light are measured using a modulating prism grating, a differential photodetection system and a digital correlator. With this system a flow velocity distribution can be analysed with a spatial resolution approaching the theoretical resolution limit given by the numerical aperture of the objective lens. Flow velocity profiles in glass capillaries could be measured down to wall distances on the order of 1 micron (μm) for water as well as human blood plasma.

Citation Download Citation

B. Reuter and N. Talukder "New differential laser microanemometer", Proc. SPIE 0236, 1980 European Conf on Optical Systems and Applications, (15 May 1981); https://doi.org/10.1117/12.959015

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