ANALYZING AND SELECTING DEVICE FOR CORPUSCLE

PURPOSE:To measure corpuscles with high accuracy by detecting the inclination of a thin flow of a corpuscle suspension by detectors provided upright at two points in horizontal surfaces containing the optical axis of a photodetection system for an analysis of corpuscles by a flow cytometry. CONSTITUTION:Corpuscles are fallen in a fine flow 13 from a nozzle 4 and irradiated with light 5, whose reflected light is received by the photodetection system 6. When the thin flow 13 is perpendicular to the horizontal surface S1 of the irradiation light 5 and photodetection system 6, the light is scattered to the horizontal surface S1 to form an image I1 of a scattered light belt on a photodetection surface P1 provided vertically to the horizontal surface S1. Further, if the thin flow 13' slants to the horizontal surface S1, an image I2 of a scattered light belt is formed on a photodetection surface P' (not shown in figure) provided vertically on a slanting horizontal surface S2. The intensity of detection light is detected by detectors provided on the photodetection surfaces P and P' provided perpendicularly at two points in the horizontal surfaces S1 and S2 and the inclination of the thin flow is calculated electrically from the images I1 and I2 of the scattered light belts. Thus, the position shift of the thin flow is detected and adjusted, so corpuscles are measured with high accuracy.