A Bessel beam laser Doppler velocimeter |
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| Authors: | Andreas Voigt Sascha Heitkam Lars Büttner Jürgen Czarske |
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| Institution: | Department of Electrical Engineering and Information Technology, Laboratory for Measuring and Testing Techniques, Technische Universität Dresden, Helmholtzstrasse 18, 01069 Dresden, Germany |
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| Abstract: | We present a laser Doppler velocimeter that is based on the use of two intersecting Bessel beams instead of the conventionally used Gaussian beams. Due to the quasi non-divergent nature of the Bessel beams, a short effective measurement volume of about 40 μm length could be realized with a low fringe spacing variation of 0.3%. Both of these advantageous values were experimentally verified in flow measurements. |
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| Keywords: | Laser doppler velocimetry Bessel beam |
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