A laser beam from a light source having a laser beam emitting portion and a laser output mirror is applied to an irradiation area in a flow cell by an irradiation optical system. Scattered light and fluorescence radiated by particles flowing through the flow cell are detected by a detector. The vicinity...http://www.google.co.uk/patents/US5446532?utm_source=gb-gplus-sharePatent US5446532 - Measuring apparatus with optically conjugate radiation fulcrum and irradiated area
