A compact differential laser Doppler velocimeter using a semiconductor laser
- Jentink, H.W.
- van Beurden, J.A.J.
- Helsdingen, M.A.
- de Mul, F.F.M.
- Suichies, H.E.
- Aarnoudse, J.G.
- Greve, Jan
DOIAbstract
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
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