A compact differential laser Doppler velocimeter using a semiconductor laser

H.W. Jentink, J.A.J. van Beurden, M.A. Helsdingen, F.F.M. de Mul, H.E. Suichies, J.G. Aarnoudse, Jan Greve

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A small differential laser Doppler velocimeter which uses a semiconductor laser and a small number of optical components is described. In this device the light from the laser diode is split into coherent beams by means of a diffraction grating. The two first-order beams are crossed in a probe volume with a lens. In a test experiment the velocity of water containing 0.9 mu m polystyrene spheres was determined from the fluctuation of the scattered light. This velocity agreed with the velocity calculated from flux measurements.
Original languageUndefined
Pages (from-to)1281-1283
JournalJournal of physics E: scientific instruments
Issue number10
Publication statusPublished - 1987


  • IR-59007

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