PARTICLE SIZING AND CONCENTRATION SENSOR USING A HOLLOW SHAPED BEAM

摘要

An optical particle detection system produces an optical beam (111) which is scattered by particles (126) in a probe volume area (115). The particles (126) may scatter the beam to the detector (135). The optical beam (111) is a hollow shaped beam which may be circular/doughnut shaped, or made be of any other hollow shape. The particle (126) passes across the beam (111), and those particles (126) which pass through the center of the beam (111) are detected as being desired particles (126) to detect. The system may be used to detect particle concentration, and size. In addition, by producing an asymmetric beam, particle direction also can be detected.