Laser doppler sensor for determining speed profile of particles in flow areas of flow channels, has light sources attached to double columns, and interference strip systems formed in flow areas with opposite gradients of strip distances

摘要

The sensor (30) has an evaluation unit for evaluating recorded scattered light signals of particles (9) to determine speed profile of the particles over a channel cross section. Two double columns (35, 36) are attached at two opposite positions (31, 32) of a channel wall (34) that surrounds flow areas (39). Light sources (42, 43) are attached to the double columns, respectively and exhibit different light waves (37, 38) for illuminating the columns. Two overlapped interference strip systems (40, 41) are formed in the flow areas with opposite gradients of strip distances.