| 摘要 |
PURPOSE:To stabilize a flow path volume and optically measure, with a high accuracy, particles in a sample liquid within a short period of time by previously applying a predetermined pressure to the flow path for trickles of a sample suspension and for sheath flows of a clean fluid passing by the surroundings. CONSTITUTION:The blood is conveyed to a dilute blood tank 13b. A two-way valve 31 is opened and a measuring part 23 of a changeover valve 2 is actuated. Thereupon, a flow path 22 is communicated with flow paths 24 and 25 for an electrolyte 10, which electrolyte containing the dilute blood flows into an optical cell 26 from an inlet. Inside the optical cell 26, a pressurized electrolyte circulates from a pressurized electrolyte tank 27 through flow paths 29, 38 and is pressurized at a given pressure, whereby the electrolyte 10 flows at a stable flow rate from the inlet such as to promptly form sheath flows. The laser light from a light source 20 passes through, in the form of a thin luminous flux, the sheath flow portion inside the cell 26 and is absorbed by a blocker 19. However, the front scattering light which is diffused by blood cells is detected by an optical detector 12 and is then counted. |
