PSEUDO TELECENTRIC OPTICAL DESIGN FOR FLOW CYTOMETRIC BLOOD CELL ANALYZER

摘要

A pseudo telecentric flow cytometric optical system for the simultaneous detection of several characteristics of particles suspended in a flowing medium. The system is made up of a flowcell (128) through which the particles pass substantially one particle at a time, an optical system for directing light (121) from a light source (120) onto the flowing particles in flowcell, a side angle optical collection system (150) for receiving light from the flowing particles and for directing the light to one or more of a first set of detectors, and a forward angle collection system (160) for receiving light from the flowing particles and for directing the light to one or more of a second set of detectors. The side angle optical collection system can include a condenser lens (132) for directing light toward the first set of detectors with an exit pupil (151) of the condenser lens located at the back focal plane of the condenser lens; a photosensitive surface of one or more of the first set of detectors (141, 142, 143, 144) is located at conjugate points of the back focal plane of the condenser lens such that an image of the exit pupil is positioned at the photosensitive surface of one or more of the first set of detectors. The forward angle optical collection system can include a collecting lens (130) for directing light toward the second set of detectors (131) where the collecting lens exit pupil is located in the back focal plane of the collecting lens and a photosensitive surface of one or more of the second set of detectors is located at the back focal plane of the collecting lens.