Method Liquefaction of Starchcontaining Material

摘要

The present invention relates to a laser projection system ( 1 ) having means for reducing the coherence of a generated laser beam ( 3 ) in order to reduce the occurrence of annoying speckle artefacts in images produced by the system. Coherence is reduced by letting the laser beam ( 3 ) pass through a transparent cell ( 6 ) comprising first (A) and second (B) immiscible fluids having different refractive indices. The fluids are displaced in the cell, preferably using an electrowetting technique. The cell ( 6 ) may thus be realised as an electrowetting lens, which is driven with a pseudo random driving signal.